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symtable Access to the compiler s symbol tables Source code Lib symtable py Symbol tables are generated by the compiler from AST just before bytecode is generated The symbol table is responsible for calculating the scope of every identifier in the code symtable provides an interface to examine these tables Generating Symbol Tables symtable symtable code filename compile_type Return the toplevel SymbolTable for the Python source code filename is the name of the file containing the code compile_type is like the mode argument to compile Examining Symbol Tables class symtable SymbolTable A namespace table for a block The constructor is not public get_type Return the type of the symbol table Possible values are class module function annotation TypeVar bound type alias and type parameter The latter four refer to different flavors of annotation scopes Changed in version 3 12 Added annotation TypeVar bound type alias and type parameter as possible return values get_id Return the table s identifier get_name Return the table s name This is the name of the class if the table is for a class the name of the function if the table is for a function or top if the table is global get_type returns module For type parameter scopes which are used for generic classes functions and type aliases it is the name of the underlying class function or type alias For type alias scopes it is the name of the type alias For TypeVar bound scopes it is the name of the TypeVar get_lineno Return the number of the first line in the block this table represents is_optimized Return True if the locals in this table can be optimized is_nested Return True if the block is a nested class or function has_children Return True if the block has nested namespaces within it These can be obtained with get_children get_identifiers Return a view object containing the names of symbols in the table See the documentation of view objects lookup name Lookup name in the table and return a Symbol instance get_symbols Return a list of Symbol instances for names in the table get_children Return a list of the nested symbol tables class symtable Function A namespace for a function or method This class inherits from SymbolTable get_parameters Return a tuple containing names of parameters to this function get_locals Return a tuple containing names of locals in this function get_globals Return a tuple containing names of globals in this function get_nonlocals Return a tuple containing names of nonlocals in this function get_frees Return a tuple containing names of free variables in this function class symtable Class A namespace of a class This class inherits from SymbolTable get_methods Return a tuple containing the names of methods declared in the class class symtable Symbol An entry in a SymbolTable corresponding to an identifier in the source The constructor is not public get_name Return the symbol s name is_referenced Return True if the symbol is used in its block is_imported Return True if the symbol is created from an import statement is_parameter Return True if the symbol is a parameter is_global Return True if the symbol is global is_nonlocal Return True if the symbol is nonlocal is_declared_global Return True if the symbol is declared global with a global statement is_local Return True if the symbol is local to its block is_annotated Return True if the symbol is annotated New in version 3 6 is_free Return True if the symbol is referenced in its block but not assigned to is_assigned Return True if the symbol is assigned to in its block is_namespace Return True if name binding introduces new namespace If the name is used as the target of a function or class statement this will be true For example table symtable symtable def some_func pass string exec table lookup some_func is_namespace True Note that a single name can be bound to multiple objects If the result is True the name may also be bound to other objects like an int or list that does not introduce a new namespace get_namespaces Return a list of namespaces bound to this name get_namespace Return the namespace bound to this na
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1
me If more than one or no namespace is bound to this name a ValueError is raised
en
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2
lzma Compression using the LZMA algorithm New in version 3 3 Source code Lib lzma py This module provides classes and convenience functions for compressing and decompressing data using the LZMA compression algorithm Also included is a file interface supporting the xz and legacy lzma file formats used by the xz utility as well as raw compressed streams The interface provided by this module is very similar to that of the bz2 module Note that LZMAFile and bz2 BZ2File are not thread safe so if you need to use a single LZMAFile instance from multiple threads it is necessary to protect it with a lock exception lzma LZMAError This exception is raised when an error occurs during compression or decompression or while initializing the compressor decompressor state Reading and writing compressed files lzma open filename mode rb format None check 1 preset None filters None encoding None errors None newline None Open an LZMA compressed file in binary or text mode returning a file object The filename argument can be either an actual file name given as a str bytes or path like object in which case the named file is opened or it can be an existing file object to read from or write to The mode argument can be any of r rb w wb x xb a or ab for binary mode or rt wt xt or at for text mode The default is rb When opening a file for reading the format and filters arguments have the same meanings as for LZMADecompressor In this case the check and preset arguments should not be used When opening a file for writing the format check preset and filters arguments have the same meanings as for LZMACompressor For binary mode this function is equivalent to the LZMAFile constructor LZMAFile filename mode In this case the encoding errors and newline arguments must not be provided For text mode a LZMAFile object is created and wrapped in an io TextIOWrapper instance with the specified encoding error handling behavior and line ending s Changed in version 3 4 Added support for the x xb and xt modes Changed in version 3 6 Accepts a path like object class lzma LZMAFile filename None mode r format None check 1 preset None filters None Open an LZMA compressed file in binary mode An LZMAFile can wrap an already open file object or operate directly on a named file The filename argument specifies either the file object to wrap or the name of the file to open as a str bytes or path like object When wrapping an existing file object the wrapped file will not be closed when the LZMAFile is closed The mode argument can be either r for reading default w for overwriting x for exclusive creation or a for appending These can equivalently be given as rb wb xb and ab respectively If filename is a file object rather than an actual file name a mode of w does not truncate the file and is instead equivalent to a When opening a file for reading the input file may be the concatenation of multiple separate compressed streams These are transparently decoded as a single logical stream When opening a file for reading the format and filters arguments have the same meanings as for LZMADecompressor In this case the check and preset arguments should not be used When opening a file for writing the format check preset and filters arguments have the same meanings as for LZMACompressor LZMAFile supports all the members specified by io BufferedIOBase except for detach and truncate Iteration and the with statement are supported The following method is also provided peek size 1 Return buffered data without advancing the file position At least one byte of data will be returned unless EOF has been reached The exact number of bytes returned is unspecified the size argument is ignored Note While calling peek does not change the file position of the LZMAFile it may change the position of the underlying file object e g if the LZMAFile was constructed by passing a file object for filename Changed in version 3 4 Added support for the x and xb modes Changed in version 3 5 The read method now accepts an argument of None Changed in version 3 6 Accepts a path like object Compressing and decompressing data i
en
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3
n memory class lzma LZMACompressor format FORMAT_XZ check 1 preset None filters None Create a compressor object which can be used to compress data incrementally For a more convenient way of compressing a single chunk of data see compress The format argument specifies what container format should be used Possible values are FORMAT_XZ The xz container format This is the default format FORMAT_ALONE The legacy lzma container format This format is more limited than xz it does not support integrity checks or multiple filters FORMAT_RAW A raw data stream not using any container format This format specifier does not support integrity checks and requires that you always specify a custom filter chain for both compression and decompression Additionally data compressed in this manner cannot be decompressed using FORMAT_AUTO see LZMADecompressor The check argument specifies the type of integrity check to include in the compressed data This check is used when decompressing to ensure that the data has not been corrupted Possible values are CHECK_NONE No integrity check This is the default and the only acceptable value for FORMAT_ALONE and FORMAT_RAW CHECK_CRC32 32 bit Cyclic Redundancy Check CHECK_CRC64 64 bit Cyclic Redundancy Check This is the default for FORMAT_XZ CHECK_SHA256 256 bit Secure Hash Algorithm If the specified check is not supported an LZMAError is raised The compression settings can be specified either as a preset compression level with the preset argument or in detail as a custom filter chain with the filters argument The preset argument if provided should be an integer between 0 and 9 inclusive optionally OR ed with the constant PRESET_EXTREME If neither preset nor filters are given the default behavior is to use PRESET_DEFAULT preset level 6 Higher presets produce smaller output but make the compression process slower Note In addition to being more CPU intensive compression with higher presets also requires much more memory and produces output that needs more memory to decompress With preset 9 for example the overhead for an LZMACompressor object can be as high as 800 MiB For this reason it is generally best to stick with the default preset The filters argument if provided should be a filter chain specifier See Specifying custom filter chains for details compress data Compress data a bytes object returning a bytes object containing compressed data for at least part of the input Some of data may be buffered internally for use in later calls to compress and flush The returned data should be concatenated with the output of any previous calls to compress flush Finish the compression process returning a bytes object containing any data stored in the compressor s internal buffers The compressor cannot be used after this method has been called class lzma LZMADecompressor format FORMAT_AUTO memlimit None filters None Create a decompressor object which can be used to decompress data incrementally For a more convenient way of decompressing an entire compressed stream at once see decompress The format argument specifies the container format that should be used The default is FORMAT_AUTO which can decompress both xz and lzma files Other possible values are FORMAT_XZ FORMAT_ALONE and FORMAT_RAW The memlimit argument specifies a limit in bytes on the amount of memory that the decompressor can use When this argument is used decompression will fail with an LZMAError if it is not possible to decompress the input within the given memory limit The filters argument specifies the filter chain that was used to create the stream being decompressed This argument is required if format is FORMAT_RAW but should not be used for other formats See Specifying custom filter chains for more information about filter chains Note This class does not transparently handle inputs containing multiple compressed streams unlike decompress and LZMAFile To decompress a multi stream input with LZMADecompressor you must create a new decompressor for each stream decompress data max_length 1 Decompress data a bytes like object returning uncompressed data as bytes
en
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4
Some of data may be buffered internally for use in later calls to decompress The returned data should be concatenated with the output of any previous calls to decompress If max_length is nonnegative returns at most max_length bytes of decompressed data If this limit is reached and further output can be produced the needs_input attribute will be set to False In this case the next call to decompress may provide data as b to obtain more of the output If all of the input data was decompressed and returned either because this was less than max_length bytes or because max_length was negative the needs_input attribute will be set to True Attempting to decompress data after the end of stream is reached raises an EOFError Any data found after the end of the stream is ignored and saved in the unused_data attribute Changed in version 3 5 Added the max_length parameter check The ID of the integrity check used by the input stream This may be CHECK_UNKNOWN until enough of the input has been decoded to determine what integrity check it uses eof True if the end of stream marker has been reached unused_data Data found after the end of the compressed stream Before the end of the stream is reached this will be b needs_input False if the decompress method can provide more decompressed data before requiring new uncompressed input New in version 3 5 lzma compress data format FORMAT_XZ check 1 preset None filters None Compress data a bytes object returning the compressed data as a bytes object See LZMACompressor above for a description of the format check preset and filters arguments lzma decompress data format FORMAT_AUTO memlimit None filters None Decompress data a bytes object returning the uncompressed data as a bytes object If data is the concatenation of multiple distinct compressed streams decompress all of these streams and return the concatenation of the results See LZMADecompressor above for a description of the format memlimit and filters arguments Miscellaneous lzma is_check_supported check Return True if the given integrity check is supported on this system CHECK_NONE and CHECK_CRC32 are always supported CHECK_CRC64 and CHECK_SHA256 may be unavailable if you are using a version of liblzma that was compiled with a limited feature set Specifying custom filter chains A filter chain specifier is a sequence of dictionaries where each dictionary contains the ID and options for a single filter Each dictionary must contain the key id and may contain additional keys to specify filter dependent options Valid filter IDs are as follows Compression filters FILTER_LZMA1 for use with FORMAT_ALONE FILTER_LZMA2 for use with FORMAT_XZ and FORMAT_RAW Delta filter FILTER_DELTA Branch Call Jump BCJ filters FILTER_X86 FILTER_IA64 FILTER_ARM FILTER_ARMTHUMB FILTER_POWERPC FILTER_SPARC A filter chain can consist of up to 4 filters and cannot be empty The last filter in the chain must be a compression filter and any other filters must be delta or BCJ filters Compression filters support the following options specified as additional entries in the dictionary representing the filter preset A compression preset to use as a source of default values for options that are not specified explicitly dict_size Dictionary size in bytes This should be between 4 KiB and 1 5 GiB inclusive lc Number of literal context bits lp Number of literal position bits The sum lc lp must be at most 4 pb Number of position bits must be at most 4 mode MODE_FAST or MODE_NORMAL nice_len What should be considered a nice length for a match This should be 273 or less mf What match finder to use MF_HC3 MF_HC4 MF_BT2 MF_BT3 or MF_BT4 depth Maximum search depth used by match finder 0 default means to select automatically based on other filter options The delta filter stores the differences between bytes producing more repetitive input for the compressor in certain circumstances It supports one option dist This indicates the distance between bytes to be subtracted The default is 1 i e take the differences between adjacent bytes The BCJ filters are intended to be applied to machine code They co
en
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5
nvert relative branches calls and jumps in the code to use absolute addressing with the aim of increasing the redundancy that can be exploited by the compressor These filters support one option start_offset This specifies the address that should be mapped to the beginning of the input data The default is 0 Examples Reading in a compressed file import lzma with lzma open file xz as f file_content f read Creating a compressed file import lzma data b Insert Data Here with lzma open file xz w as f f write data Compressing data in memory import lzma data_in b Insert Data Here data_out lzma compress data_in Incremental compression import lzma lzc lzma LZMACompressor out1 lzc compress b Some data n out2 lzc compress b Another piece of data n out3 lzc compress b Even more data n out4 lzc flush Concatenate all the partial results result b join out1 out2 out3 out4 Writing compressed data to an already open file import lzma with open file xz wb as f f write b This data will not be compressed n with lzma open f w as lzf lzf write b This will be compressed n f write b Not compressed n Creating a compressed file using a custom filter chain import lzma my_filters id lzma FILTER_DELTA dist 5 id lzma FILTER_LZMA2 preset 7 lzma PRESET_EXTREME with lzma open file xz w filters my_filters as f f write b blah blah blah
en
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6
keyword Testing for Python keywords Source code Lib keyword py This module allows a Python program to determine if a string is a keyword or soft keyword keyword iskeyword s Return True if s is a Python keyword keyword kwlist Sequence containing all the keywords defined for the interpreter If any keywords are defined to only be active when particular __future__ statements are in effect these will be included as well keyword issoftkeyword s Return True if s is a Python soft keyword New in version 3 9 keyword softkwlist Sequence containing all the soft keywords defined for the interpreter If any soft keywords are defined to only be active when particular __future__ statements are in effect these will be included as well New in version 3 9
en
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7
Design and History FAQ Why does Python use indentation for grouping of statements Guido van Rossum believes that using indentation for grouping is extremely elegant and contributes a lot to the clarity of the average Python program Most people learn to love this feature after a while Since there are no begin end brackets there cannot be a disagreement between grouping perceived by the parser and the human reader Occasionally C programmers will encounter a fragment of code like this if x y x y z Only the x statement is executed if the condition is true but the indentation leads many to believe otherwise Even experienced C programmers will sometimes stare at it a long time wondering as to why y is being decremented even for x y Because there are no begin end brackets Python is much less prone to coding style conflicts In C there are many different ways to place the braces After becoming used to reading and writing code using a particular style it is normal to feel somewhat uneasy when reading or being required to write in a different one Many coding styles place begin end brackets on a line by themselves This makes programs considerably longer and wastes valuable screen space making it harder to get a good overview of a program Ideally a function should fit on one screen say 20 30 lines 20 lines of Python can do a lot more work than 20 lines of C This is not solely due to the lack of begin end brackets the lack of declarations and the high level data types are also responsible but the indentation based syntax certainly helps Why am I getting strange results with simple arithmetic operations See the next question Why are floating point calculations so inaccurate Users are often surprised by results like this 1 2 1 0 0 19999999999999996 and think it is a bug in Python It s not This has little to do with Python and much more to do with how the underlying platform handles floating point numbers The float type in CPython uses a C double for storage A float object s value is stored in binary floating point with a fixed precision typically 53 bits and Python uses C operations which in turn rely on the hardware implementation in the processor to perform floating point operations This means that as far as floating point operations are concerned Python behaves like many popular languages including C and Java Many numbers that can be written easily in decimal notation cannot be expressed exactly in binary floating point For example after x 1 2 the value stored for x is a very good approximation to the decimal value 1 2 but is not exactly equal to it On a typical machine the actual stored value is 1 0011001100110011001100110011001100110011001100110011 binary which is exactly 1 1999999999999999555910790149937383830547332763671875 decimal The typical precision of 53 bits provides Python floats with 15 16 decimal digits of accuracy For a fuller explanation please see the floating point arithmetic chapter in the Python tutorial Why are Python strings immutable There are several advantages One is performance knowing that a string is immutable means we can allocate space for it at creation time and the storage requirements are fixed and unchanging This is also one of the reasons for the distinction between tuples and lists Another advantage is that strings in Python are considered as elemental as numbers No amount of activity will change the value 8 to anything else and in Python no amount of activity will change the string eight to anything else Why must self be used explicitly in method definitions and calls The idea was borrowed from Modula 3 It turns out to be very useful for a variety of reasons First it s more obvious that you are using a method or instance attribute instead of a local variable Reading self x or self meth makes it absolutely clear that an instance variable or method is used even if you don t know the class definition by heart In C you can sort of tell by the lack of a local variable declaration assuming globals are rare or easily recognizable but in Python there are no local variable declarations so you d have to look
en
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57, 56, 54, 53, 50, 54, 44, 48, 46, 48, 51, 55, 54, 50, 55, 55, 53, 50, 56, 55, 48, 51, 50, 49, 50, 55, 52, 44, 45, 48, 46, 48, 48, 52, 56, 54, 57, 57, 57, 51, 55, 55, 54, 48, 56, 50, 57, 57, 50, 54, 44, 48, 46, 48, 49, 57, 48, 52, 55, 48, 52, 50, 51, 53, 52, 57, 52, 49, 51, 54, 56, 44, 45, 48, 46, 49, 50, 53, 54, 52, 53, 49, 49, 53, 57, 55, 49, 53, 54, 53, 50, 53, 44, 45, 48, 46, 48, 50, 53, 53, 53, 48, 53, 49, 52, 52, 53, 57, 54, 48, 57, 57, 56, 53, 44, 48, 46, 48, 48, 53, 56, 56, 53, 49, 57, 55, 51, 49, 53, 51, 54, 53, 48, 55, 54, 44, 48, 46, 48, 50, 57, 49, 49, 56, 53, 55, 56, 56, 56, 49, 48, 50, 53, 51, 49, 52, 44, 45, 48, 46, 48, 57, 56, 55, 51, 57, 56, 52, 55, 53, 52, 48, 56, 53, 53, 52, 49, 44, 45, 48, 46, 48, 54, 54, 50, 54, 56, 54, 49, 53, 52, 50, 52, 54, 51, 51, 48, 51, 44, 45, 48, 46, 48, 56, 48, 48, 55, 53, 55, 52, 48, 56, 49, 52, 50, 48, 56, 57, 56, 44, 45, 48, 46, 48, 49, 54, 49, 56, 51, 50, 57, 57, 57, 52, 51, 56, 48, 52, 55, 52, 44, 45, 48, 46, 48, 49, 49, 53, 51, 50, 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50, 53, 50, 56, 53, 53, 51, 51, 56, 49, 53, 54, 50, 50, 51, 51, 44, 48, 46, 48, 57, 50, 52, 50, 52, 53, 52, 49, 55, 49, 49, 56, 48, 55, 50, 53, 44, 45, 48, 46, 48, 51, 49, 52, 49, 49, 56, 48, 55, 57, 56, 52, 49, 49, 51, 54, 57, 44, 45, 48, 46, 48, 55, 52, 55, 56, 55, 51, 54, 51, 52, 48, 57, 57, 57, 54, 48, 51, 44, 45, 48, 46, 48, 53, 55, 53, 48, 52, 55, 57, 53, 52, 57, 49, 54, 57, 53, 52, 48, 52, 44, 48, 46, 48, 51, 52, 49, 54, 55, 54, 53, 52, 56, 49, 50, 51, 51, 53, 57, 55, 44, 45, 48, 46, 48, 49, 55, 48, 50, 52, 49, 55, 57, 57, 50, 48, 53, 53, 52, 49, 54, 44, 45, 48, 46, 48, 51, 56, 57, 51, 57, 49, 48, 55, 50, 48, 57, 52, 52, 52, 48, 52, 54, 44, 45, 48, 46, 48, 54, 48, 54, 57, 53, 53, 52, 48, 49, 53, 57, 57, 52, 48, 55, 50, 44, 48, 46, 48, 51, 55, 51, 56, 50, 48, 54, 54, 50, 52, 57, 56, 52, 55, 52, 49, 44, 45, 48, 46, 48, 55, 50, 49, 53, 55, 56, 55, 52, 55, 48, 51, 52, 48, 55, 50, 57, 44, 48, 46, 48, 53, 56, 56, 50, 51, 55, 56, 50, 57, 53, 48, 54, 51, 57, 55, 50, 53, 44, 45, 48, 46, 48, 48, 57, 56, 50, 53, 49, 56, 53, 56, 55, 50, 54, 49, 52, 51, 56, 52, 44, 48, 46, 48, 50, 55, 57, 55, 53, 56, 51, 49, 49, 56, 48, 56, 49, 48, 57, 51, 44, 45, 48, 46, 48, 50, 57, 48, 49, 51, 48, 55, 49, 50, 48, 57, 49, 57, 50, 50, 55, 54, 44, 45, 48, 46, 48, 49, 54, 56, 55, 49, 56, 53, 48, 57, 51, 55, 54, 48, 52, 57, 48, 52, 44, 48, 46, 48, 56, 48, 53, 53, 51, 51, 50, 51, 48, 51, 48, 52, 55, 49, 56, 44, 48, 46, 48, 54, 56, 52, 53, 56, 54, 51, 57, 48, 56, 53, 50, 57, 50, 56, 50, 44, 48, 46, 48, 52, 55, 56, 56, 51, 52, 55, 51, 51, 51, 54, 54, 57, 54, 54, 50, 53, 44, 48, 46, 48, 52, 54, 52, 52, 51, 48, 49, 57, 48, 54, 50, 50, 56, 48, 54, 53, 53, 44, 48, 46, 48, 57, 49, 54, 49, 54, 51, 54, 50, 51, 51, 51, 50, 57, 55, 55, 51, 44, 45, 48, 46, 48, 51, 55, 48, 48, 55, 51, 48, 53, 55, 55, 49, 49, 49, 50, 52, 52, 44, 48, 46, 48, 51, 53, 52, 56, 48, 55, 49, 57, 48, 53, 57, 55, 48, 53, 55, 51, 52, 44, 48, 46, 48, 48, 54, 49, 51, 48, 55, 57, 52, 57, 57, 52, 53, 51, 51, 48, 54, 50, 44, 48, 46, 48, 51, 50, 53, 48, 53, 51, 52, 52, 53, 57, 57, 52, 56, 53, 52, 44, 45, 48, 46, 48, 51, 53, 57, 50, 57, 50, 53, 49, 52, 54, 50, 50, 50, 49, 49, 52, 54, 44, 45, 48, 46, 48, 50, 48, 53, 51, 48, 57, 51, 51, 53, 49, 52, 50, 51, 55, 52, 48, 52, 44, 45, 48, 46, 48, 55, 51, 52, 51, 56, 51, 51, 49, 52, 56, 52, 55, 57, 52, 54, 50, 44, 45, 48, 46, 48, 50, 56, 49, 57, 50, 54, 53, 55, 57, 55, 55, 51, 52, 50, 54, 48, 54, 44, 48, 46, 48, 52, 54, 53, 56, 50, 56, 57, 54, 50, 54, 50, 52, 48, 55, 51, 44, 45, 48, 46, 48, 48, 54, 53, 51, 48, 52, 52, 51, 50, 48, 54, 52, 50, 57, 52, 56, 49, 53, 44, 45, 48, 46, 48, 53, 51, 52, 57, 55, 50, 57, 57, 53, 53, 49, 57, 54, 51, 56, 48, 54, 44, 48, 46, 48, 48, 56, 49, 50, 54, 48, 49, 48, 49, 56, 54, 57, 55, 48, 50, 51, 52, 44, 48, 46, 48, 54, 52, 54, 56, 53, 48, 51, 57, 50, 50, 50, 50, 52, 48, 52, 53, 44, 45, 48, 46, 48, 57, 48, 54, 56, 48, 53, 57, 49, 55, 54, 50, 48, 54, 53, 56, 57, 44, 45, 48, 46, 48, 52, 56, 55, 49, 53, 53, 54, 53, 51, 53, 51, 54, 51, 49, 57, 55, 44, 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8
up the class definition to be sure Some C and Java coding standards call for instance attributes to have an m_ prefix so this explicitness is still useful in those languages too Second it means that no special syntax is necessary if you want to explicitly reference or call the method from a particular class In C if you want to use a method from a base class which is overridden in a derived class you have to use the operator in Python you can write baseclass methodname self argument list This is particularly useful for __init__ methods and in general in cases where a derived class method wants to extend the base class method of the same name and thus has to call the base class method somehow Finally for instance variables it solves a syntactic problem with assignment since local variables in Python are by definition those variables to which a value is assigned in a function body and that aren t explicitly declared global there has to be some way to tell the interpreter that an assignment was meant to assign to an instance variable instead of to a local variable and it should preferably be syntactic for efficiency reasons C does this through declarations but Python doesn t have declarations and it would be a pity having to introduce them just for this purpose Using the explicit self var solves this nicely Similarly for using instance variables having to write self var means that references to unqualified names inside a method don t have to search the instance s directories To put it another way local variables and instance variables live in two different namespaces and you need to tell Python which namespace to use Why can t I use an assignment in an expression Starting in Python 3 8 you can Assignment expressions using the walrus operator assign a variable in an expression while chunk fp read 200 print chunk See PEP 572 for more information Why does Python use methods for some functionality e g list index but functions for other e g len list As Guido said a For some operations prefix notation just reads better than postfix prefix and infix operations have a long tradition in mathematics which likes notations where the visuals help the mathematician thinking about a problem Compare the easy with which we rewrite a formula like x a b into x a x b to the clumsiness of doing the same thing using a raw OO notation b When I read code that says len x I know that it is asking for the length of something This tells me two things the result is an integer and the argument is some kind of container To the contrary when I read x len I have to already know that x is some kind of container implementing an interface or inheriting from a class that has a standard len Witness the confusion we occasionally have when a class that is not implementing a mapping has a get or keys method or something that isn t a file has a write method https mail python org pipermail python 3000 2006 November 004 643 html Why is join a string method instead of a list or tuple method Strings became much more like other standard types starting in Python 1 6 when methods were added which give the same functionality that has always been available using the functions of the string module Most of these new methods have been widely accepted but the one which appears to make some programmers feel uncomfortable is join 1 2 4 8 16 which gives the result 1 2 4 8 16 There are two common arguments against this usage The first runs along the lines of It looks really ugly using a method of a string literal string constant to which the answer is that it might but a string literal is just a fixed value If the methods are to be allowed on names bound to strings there is no logical reason to make them unavailable on literals The second objection is typically cast as I am really telling a sequence to join its members together with a string constant Sadly you aren t For some reason there seems to be much less difficulty with having split as a string method since in that case it is easy to see that 1 2 4 8 16 split is an instruction to a string literal to return the substrings deli
en
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9
mited by the given separator or by default arbitrary runs of white space join is a string method because in using it you are telling the separator string to iterate over a sequence of strings and insert itself between adjacent elements This method can be used with any argument which obeys the rules for sequence objects including any new classes you might define yourself Similar methods exist for bytes and bytearray objects How fast are exceptions A try except block is extremely efficient if no exceptions are raised Actually catching an exception is expensive In versions of Python prior to 2 0 it was common to use this idiom try value mydict key except KeyError mydict key getvalue key value mydict key This only made sense when you expected the dict to have the key almost all the time If that wasn t the case you coded it like this if key in mydict value mydict key else value mydict key getvalue key For this specific case you could also use value dict setdefault key getvalue key but only if the getvalue call is cheap enough because it is evaluated in all cases Why isn t there a switch or case statement in Python In general structured switch statements execute one block of code when an expression has a particular value or set of values Since Python 3 10 one can easily match literal values or constants within a namespace with a match case statement An older alternative is a sequence of if elif elif else For cases where you need to choose from a very large number of possibilities you can create a dictionary mapping case values to functions to call For example functions a function_1 b function_2 c self method_1 func functions value func For calling methods on objects you can simplify yet further by using the getattr built in to retrieve methods with a particular name class MyVisitor def visit_a self def dispatch self value method_name visit_ str value method getattr self method_name method It s suggested that you use a prefix for the method names such as visit_ in this example Without such a prefix if values are coming from an untrusted source an attacker would be able to call any method on your object Imitating switch with fallthrough as with C s switch case default is possible much harder and less needed Can t you emulate threads in the interpreter instead of relying on an OS specific thread implementation Answer 1 Unfortunately the interpreter pushes at least one C stack frame for each Python stack frame Also extensions can call back into Python at almost random moments Therefore a complete threads implementation requires thread support for C Answer 2 Fortunately there is Stackless Python which has a completely redesigned interpreter loop that avoids the C stack Why can t lambda expressions contain statements Python lambda expressions cannot contain statements because Python s syntactic framework can t handle statements nested inside expressions However in Python this is not a serious problem Unlike lambda forms in other languages where they add functionality Python lambdas are only a shorthand notation if you re too lazy to define a function Functions are already first class objects in Python and can be declared in a local scope Therefore the only advantage of using a lambda instead of a locally defined function is that you don t need to invent a name for the function but that s just a local variable to which the function object which is exactly the same type of object that a lambda expression yields is assigned Can Python be compiled to machine code C or some other language Cython compiles a modified version of Python with optional annotations into C extensions Nuitka is an up and coming compiler of Python into C code aiming to support the full Python language How does Python manage memory The details of Python memory management depend on the implementation The standard implementation of Python CPython uses reference counting to detect inaccessible objects and another mechanism to collect reference cycles periodically executing a cycle detection algorithm which looks for inaccessible cycles and deletes the objects involved
en
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10
The gc module provides functions to perform a garbage collection obtain debugging statistics and tune the collector s parameters Other implementations such as Jython or PyPy however can rely on a different mechanism such as a full blown garbage collector This difference can cause some subtle porting problems if your Python code depends on the behavior of the reference counting implementation In some Python implementations the following code which is fine in CPython will probably run out of file descriptors for file in very_long_list_of_files f open file c f read 1 Indeed using CPython s reference counting and destructor scheme each new assignment to f closes the previous file With a traditional GC however those file objects will only get collected and closed at varying and possibly long intervals If you want to write code that will work with any Python implementation you should explicitly close the file or use the with statement this will work regardless of memory management scheme for file in very_long_list_of_files with open file as f c f read 1 Why doesn t CPython use a more traditional garbage collection scheme For one thing this is not a C standard feature and hence it s not portable Yes we know about the Boehm GC library It has bits of assembler code for most common platforms not for all of them and although it is mostly transparent it isn t completely transparent patches are required to get Python to work with it Traditional GC also becomes a problem when Python is embedded into other applications While in a standalone Python it s fine to replace the standard malloc and free with versions provided by the GC library an application embedding Python may want to have its own substitute for malloc and free and may not want Python s Right now CPython works with anything that implements malloc and free properly Why isn t all memory freed when CPython exits Objects referenced from the global namespaces of Python modules are not always deallocated when Python exits This may happen if there are circular references There are also certain bits of memory that are allocated by the C library that are impossible to free e g a tool like Purify will complain about these Python is however aggressive about cleaning up memory on exit and does try to destroy every single object If you want to force Python to delete certain things on deallocation use the atexit module to run a function that will force those deletions Why are there separate tuple and list data types Lists and tuples while similar in many respects are generally used in fundamentally different ways Tuples can be thought of as being similar to Pascal records or C structs they re small collections of related data which may be of different types which are operated on as a group For example a Cartesian coordinate is appropriately represented as a tuple of two or three numbers Lists on the other hand are more like arrays in other languages They tend to hold a varying number of objects all of which have the same type and which are operated on one by one For example os listdir returns a list of strings representing the files in the current directory Functions which operate on this output would generally not break if you added another file or two to the directory Tuples are immutable meaning that once a tuple has been created you can t replace any of its elements with a new value Lists are mutable meaning that you can always change a list s elements Only immutable elements can be used as dictionary keys and hence only tuples and not lists can be used as keys How are lists implemented in CPython CPython s lists are really variable length arrays not Lisp style linked lists The implementation uses a contiguous array of references to other objects and keeps a pointer to this array and the array s length in a list head structure This makes indexing a list a i an operation whose cost is independent of the size of the list or the value of the index When items are appended or inserted the array of references is resized Some cleverness is applied to improve the performance of appending it
en
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11
ems repeatedly when the array must be grown some extra space is allocated so the next few times don t require an actual resize How are dictionaries implemented in CPython CPython s dictionaries are implemented as resizable hash tables Compared to B trees this gives better performance for lookup the most common operation by far under most circumstances and the implementation is simpler Dictionaries work by computing a hash code for each key stored in the dictionary using the hash built in function The hash code varies widely depending on the key and a per process seed for example Python could hash to 539294296 while python a string that differs by a single bit could hash to 1142331976 The hash code is then used to calculate a location in an internal array where the value will be stored Assuming that you re storing keys that all have different hash values this means that dictionaries take constant time O 1 in Big O notation to retrieve a key Why must dictionary keys be immutable The hash table implementation of dictionaries uses a hash value calculated from the key value to find the key If the key were a mutable object its value could change and thus its hash could also change But since whoever changes the key object can t tell that it was being used as a dictionary key it can t move the entry around in the dictionary Then when you try to look up the same object in the dictionary it won t be found because its hash value is different If you tried to look up the old value it wouldn t be found either because the value of the object found in that hash bin would be different If you want a dictionary indexed with a list simply convert the list to a tuple first the function tuple L creates a tuple with the same entries as the list L Tuples are immutable and can therefore be used as dictionary keys Some unacceptable solutions that have been proposed Hash lists by their address object ID This doesn t work because if you construct a new list with the same value it won t be found e g mydict 1 2 12 print mydict 1 2 would raise a KeyError exception because the id of the 1 2 used in the second line differs from that in the first line In other words dictionary keys should be compared using not using is Make a copy when using a list as a key This doesn t work because the list being a mutable object could contain a reference to itself and then the copying code would run into an infinite loop Allow lists as keys but tell the user not to modify them This would allow a class of hard to track bugs in programs when you forgot or modified a list by accident It also invalidates an important invariant of dictionaries every value in d keys is usable as a key of the dictionary Mark lists as read only once they are used as a dictionary key The problem is that it s not just the top level object that could change its value you could use a tuple containing a list as a key Entering anything as a key into a dictionary would require marking all objects reachable from there as read only and again self referential objects could cause an infinite loop There is a trick to get around this if you need to but use it at your own risk You can wrap a mutable structure inside a class instance which has both a __eq__ and a __hash__ method You must then make sure that the hash value for all such wrapper objects that reside in a dictionary or other hash based structure remain fixed while the object is in the dictionary or other structure class ListWrapper def __init__ self the_list self the_list the_list def __eq__ self other return self the_list other the_list def __hash__ self l self the_list result 98767 len l 555 for i el in enumerate l try result result hash el 9999999 1001 i except Exception result result 7777777 i 333 return result Note that the hash computation is complicated by the possibility that some members of the list may be unhashable and also by the possibility of arithmetic overflow Furthermore it must always be the case that if o1 o2 ie o1 __eq__ o2 is True then hash o1 hash o2 ie o1 __hash__ o2 __hash__ regardless of whether the object is in a diction
en
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12
ary or not If you fail to meet these restrictions dictionaries and other hash based structures will misbehave In the case of ListWrapper whenever the wrapper object is in a dictionary the wrapped list must not change to avoid anomalies Don t do this unless you are prepared to think hard about the requirements and the consequences of not meeting them correctly Consider yourself warned Why doesn t list sort return the sorted list In situations where performance matters making a copy of the list just to sort it would be wasteful Therefore list sort sorts the list in place In order to remind you of that fact it does not return the sorted list This way you won t be fooled into accidentally overwriting a list when you need a sorted copy but also need to keep the unsorted version around If you want to return a new list use the built in sorted function instead This function creates a new list from a provided iterable sorts it and returns it For example here s how to iterate over the keys of a dictionary in sorted order for key in sorted mydict do whatever with mydict key How do you specify and enforce an interface spec in Python An interface specification for a module as provided by languages such as C and Java describes the prototypes for the methods and functions of the module Many feel that compile time enforcement of interface specifications helps in the construction of large programs Python 2 6 adds an abc module that lets you define Abstract Base Classes ABCs You can then use isinstance and issubclass to check whether an instance or a class implements a particular ABC The collections abc module defines a set of useful ABCs such as Iterable Container and MutableMapping For Python many of the advantages of interface specifications can be obtained by an appropriate test discipline for components A good test suite for a module can both provide a regression test and serve as a module interface specification and a set of examples Many Python modules can be run as a script to provide a simple self test Even modules which use complex external interfaces can often be tested in isolation using trivial stub emulations of the external interface The doctest and unittest modules or third party test frameworks can be used to construct exhaustive test suites that exercise every line of code in a module An appropriate testing discipline can help build large complex applications in Python as well as having interface specifications would In fact it can be better because an interface specification cannot test certain properties of a program For example the list append method is expected to add new elements to the end of some internal list an interface specification cannot test that your list append implementation will actually do this correctly but it s trivial to check this property in a test suite Writing test suites is very helpful and you might want to design your code to make it easily tested One increasingly popular technique test driven development calls for writing parts of the test suite first before you write any of the actual code Of course Python allows you to be sloppy and not write test cases at all Why is there no goto In the 1970s people realized that unrestricted goto could lead to messy spaghetti code that was hard to understand and revise In a high level language it is also unneeded as long as there are ways to branch in Python with if statements and or and and if else expressions and loop with while and for statements possibly containing continue and break One can also use exceptions to provide a structured goto that works even across function calls Many feel that exceptions can conveniently emulate all reasonable uses of the go or goto constructs of C Fortran and other languages For example class label Exception pass declare a label try if condition raise label goto label except label where to goto pass This doesn t allow you to jump into the middle of a loop but that s usually considered an abuse of goto anyway Use sparingly Why can t raw strings r strings end with a backslash More precisely they can t end with an odd nu
en
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13
mber of backslashes the unpaired backslash at the end escapes the closing quote character leaving an unterminated string Raw strings were designed to ease creating input for processors chiefly regular expression engines that want to do their own backslash escape processing Such processors consider an unmatched trailing backslash to be an error anyway so raw strings disallow that In return they allow you to pass on the string quote character by escaping it with a backslash These rules work well when r strings are used for their intended purpose If you re trying to build Windows pathnames note that all Windows system calls accept forward slashes too f open mydir file txt works fine If you re trying to build a pathname for a DOS command try e g one of dir r this is my dos dir dir r this is my dos dir 1 dir this is my dos dir Why doesn t Python have a with statement for attribute assignments Python has a with statement that wraps the execution of a block calling code on the entrance and exit from the block Some languages have a construct that looks like this with obj a 1 equivalent to obj a 1 total total 1 obj total obj total 1 In Python such a construct would be ambiguous Other languages such as Object Pascal Delphi and C use static types so it s possible to know in an unambiguous way what member is being assigned to This is the main point of static typing the compiler always knows the scope of every variable at compile time Python uses dynamic types It is impossible to know in advance which attribute will be referenced at runtime Member attributes may be added or removed from objects on the fly This makes it impossible to know from a simple reading what attribute is being referenced a local one a global one or a member attribute For instance take the following incomplete snippet def foo a with a print x The snippet assumes that a must have a member attribute called x However there is nothing in Python that tells the interpreter this What should happen if a is let us say an integer If there is a global variable named x will it be used inside the with block As you see the dynamic nature of Python makes such choices much harder The primary benefit of with and similar language features reduction of code volume can however easily be achieved in Python by assignment Instead of function args mydict index index a 21 function args mydict index index b 42 function args mydict index index c 63 write this ref function args mydict index index ref a 21 ref b 42 ref c 63 This also has the side effect of increasing execution speed because name bindings are resolved at run time in Python and the second version only needs to perform the resolution once Similar proposals that would introduce syntax to further reduce code volume such as using a leading dot have been rejected in favour of explicitness see https mail python org pipermail python ideas 2016 May 040070 html Why don t generators support the with statement For technical reasons a generator used directly as a context manager would not work correctly When as is most common a generator is used as an iterator run to completion no closing is needed When it is wrap it as contextlib closing generator in the with statement Why are colons required for the if while def class statements The colon is required primarily to enhance readability one of the results of the experimental ABC language Consider this if a b print a versus if a b print a Notice how the second one is slightly easier to read Notice further how a colon sets off the example in this FAQ answer it s a standard usage in English Another minor reason is that the colon makes it easier for editors with syntax highlighting they can look for colons to decide when indentation needs to be increased instead of having to do a more elaborate parsing of the program text Why does Python allow commas at the end of lists and tuples Python lets you add a trailing comma at the end of lists tuples and dictionaries 1 2 3 a b c d A 1 5 B 6 7 last trailing comma is optional but good style There are several reasons to allow this When you have a litera
en
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56, 51, 51, 56, 53, 50, 52, 52, 48, 49, 49, 56, 56, 44, 48, 46, 48, 55, 51, 49, 52, 50, 49, 52, 56, 53, 53, 52, 51, 50, 53, 49, 44, 45, 48, 46, 48, 49, 52, 53, 57, 50, 54, 57, 51, 49, 56, 55, 50, 57, 54, 51, 57, 44, 48, 46, 48, 51, 50, 53, 49, 52, 54, 57, 56, 56, 48, 51, 52, 50, 52, 56, 51, 53, 44, 45, 48, 46, 48, 52, 53, 56, 56, 49, 55, 50, 57, 53, 55, 51, 48, 49, 49, 52, 44, 48, 46, 48, 50, 57, 55, 55, 53, 56, 52, 52, 56, 56, 54, 56, 57, 56, 57, 57, 52, 44, 48, 46, 48, 53, 53, 49, 48, 50, 48, 54, 49, 52, 56, 48, 50, 56, 51, 55, 52, 44, 48, 46, 48, 51, 53, 49, 50, 57, 53, 57, 57, 50, 55, 51, 50, 48, 52, 56, 44, 48, 46, 48, 48, 53, 53, 50, 48, 56, 56, 56, 54, 48, 52, 50, 50, 51, 55, 50, 56, 44, 48, 46, 48, 53, 53, 48, 52, 56, 50, 50, 51, 53, 56, 52, 56, 57, 48, 51, 54, 54, 44, 45, 48, 46, 49, 50, 49, 55, 53, 54, 53, 55, 54, 48, 48, 49, 54, 52, 52, 49, 51, 44, 45, 48, 46, 49, 48, 57, 52, 55, 51, 50, 56, 56, 48, 53, 57, 50, 51, 52, 54, 50, 44, 48, 46, 48, 50, 54, 56, 57, 48, 49, 50, 49, 52, 48, 48, 51, 53, 54, 50, 57, 51, 44, 45, 48, 46, 48, 48, 51, 49, 49, 50, 55, 52, 53, 55, 48, 52, 49, 50, 57, 51, 51, 56, 51, 44, 45, 48, 46, 48, 50, 49, 49, 48, 54, 49, 54, 49, 49, 55, 55, 49, 53, 56, 51, 53, 54, 44, 48, 46, 48, 50, 48, 55, 50, 56, 57, 57, 55, 56, 56, 54, 49, 56, 48, 56, 55, 56, 44, 48, 46, 48, 55, 49, 56, 57, 55, 50, 50, 51, 53, 57, 49, 56, 48, 52, 53, 44, 48, 46, 48, 48, 51, 57, 55, 51, 55, 49, 54, 52, 48, 52, 50, 56, 57, 48, 48, 55, 44, 45, 48, 46, 48, 55, 50, 49, 53, 48, 53, 52, 51, 51, 51, 50, 48, 57, 57, 57, 49, 44, 48, 46, 48, 52, 49, 56, 54, 49, 55, 48, 49, 55, 53, 54, 55, 49, 53, 55, 55, 53, 44, 45, 48, 46, 48, 52, 54, 53, 56, 48, 49, 53, 52, 52, 52, 56, 55, 52, 55, 54, 51, 53, 44, 48, 46, 48, 49, 53, 57, 51, 54, 51, 53, 55, 57, 48, 48, 53, 48, 48, 50, 57, 56, 44, 48, 46, 48, 51, 54, 52, 52, 52, 50, 54, 57, 49, 50, 48, 54, 57, 51, 50, 49, 44, 48, 46, 48, 55, 54, 54, 48, 51, 57, 49, 49, 56, 49, 55, 48, 55, 51, 56, 50, 44, 48, 46, 48, 51, 57, 51, 55, 55, 55, 50, 54, 54, 49, 52, 52, 55, 53, 50, 53, 44, 45, 48, 46, 48, 52, 55, 56, 51, 49, 48, 56, 52, 53, 55, 57, 50, 50, 57, 51, 53, 53, 93 ]

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