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16,772,071 | sort dict by value python | Get a list of pairs of key-value sorted by values in dictionary `data` | sorted(list(data.items()), key=lambda x: x[1]) |
16,772,071 | sort dict by value python | null | sorted(list(data.items()), key=lambda x: x[1]) |
5,110,352 | How do I display current time using Python + Django? | display current time | now = datetime.datetime.now().strftime('%H:%M:%S') |
1,883,980 | Find the nth occurrence of substring in a string | find the index of the second occurrence of the substring `bar` in string `foo bar bar bar` | """foo bar bar bar""".replace('bar', 'XXX', 1).find('bar') |
2,813,806 | How do you check the presence of many keys in a Python dictinary? | check if key 'stackoverflow' and key 'google' are presented in dictionary `sites` | set(['stackoverflow', 'google']).issubset(sites) |
10,037,742 | Replace part of a string in Python? | replace string ' and ' in string `stuff` with character '/' | stuff.replace(' and ', '/') |
22,712,292 | How to use `numpy.savez` in a loop for save more than one array? | Save array at index 0, index 1 and index 8 of array `np` to tmp file `tmp` | np.savez(tmp, *[getarray[0], getarray[1], getarray[8]]) |
14,043,934 | time offset | substract 1 hour and 10 minutes from current time | t = datetime.datetime.now()
(t - datetime.timedelta(hours=1, minutes=10)) |
14,043,934 | time offset | subtract 1 hour and 10 minutes from time object `t` | (t - datetime.timedelta(hours=1, minutes=10)) |
14,043,934 | time offset | add 1 hour and 2 minutes to time object `t` | dt = datetime.datetime.combine(datetime.date.today(), t) |
14,043,934 | time offset | subtract 5 hours from the time object `dt` | dt -= datetime.timedelta(hours=5) |
3,059,301 | Manipulating binary data in Python | encode string `data` using hex 'hex' encoding | print(data.encode('hex')) |
3,059,301 | Manipulating binary data in Python | Return the decimal value for each hex character in data `data` | print(' '.join([str(ord(a)) for a in data])) |
18,131,367 | python - iterating over a subset of a list of tuples | Get all the items from a list of tuple 'l' where second item in tuple is '1'. | [x for x in l if x[1] == 1] |
8,192,379 | How to read stdin to a 2d python array of integers? | Create array `a` containing integers from stdin | a.fromlist([int(val) for val in stdin.read().split()]) |
26,155,985 | Is there a way to refer to the entire matched expression in re.sub without the use of a group? | place '\' infront of each non-letter char in string `line` | print(re.sub('[_%^$]', '\\\\\\g<0>', line)) |
2,755,950 | How to use regular expression in lxml xpath? | Get all `a` tags where the text starts with value `some text` using regex | doc.xpath("//a[starts-with(text(),'some text')]") |
35,017,035 | Compare elements of a list of lists and return a list | convert a list of lists `a` into list of tuples of appropriate elements form nested lists | zip(*a) |
34,696,853 | Convert list of strings to int | convert a list of strings `lst` to list of integers | [map(int, sublist) for sublist in lst] |
34,696,853 | Convert list of strings to int | convert strings in list-of-lists `lst` to ints | [[int(x) for x in sublist] for sublist in lst] |
28,901,311 | Numpy: find index of elements in one array that occur in another array | get index of elements in array `A` that occur in another array `B` | np.where(np.in1d(A, B))[0] |
1,780,174 | Split dictionary of lists into list of dictionaries | create a list where each element is a dictionary with keys 'key1' and 'key2' and values corresponding to each value in the lists referenced by keys 'key1' and 'key2' in dictionary `d` | [{'key1': a, 'key2': b} for a, b in zip(d['key1'], d['key2'])] |
1,780,174 | Split dictionary of lists into list of dictionaries | null | map(dict, zip(*[[(k, v) for v in value] for k, value in list(d.items())])) |
42,950 | Get Last Day of the Month | Get Last Day of the first month in 2002 | calendar.monthrange(2002, 1) |
42,950 | Get Last Day of the Month | Get Last Day of the second month in 2002 | calendar.monthrange(2008, 2) |
42,950 | Get Last Day of the Month | Get Last Day of the second month in 2100 | calendar.monthrange(2100, 2) |
42,950 | Get Last Day of the Month | Get Last Day of the month `month` in year `year` | calendar.monthrange(year, month)[1] |
42,950 | Get Last Day of the Month | Get Last Day of the second month in year 2012 | monthrange(2012, 2) |
42,950 | Get Last Day of the Month | Get Last Day of the first month in year 2000 | (datetime.date(2000, 2, 1) - datetime.timedelta(days=1)) |
89,228 | Calling an external command | Calling an external command "ls -l" | from subprocess import call |
89,228 | Calling an external command | Calling an external command "some_command with args" | os.system('some_command with args') |
89,228 | Calling an external command | Calling an external command "some_command < input_file | another_command > output_file" | os.system('some_command < input_file | another_command > output_file') |
89,228 | Calling an external command | Calling an external command "some_command with args" | stream = os.popen('some_command with args') |
89,228 | Calling an external command | Calling an external command "echo Hello World" | print(subprocess.Popen('echo Hello World', shell=True, stdout=subprocess.PIPE).stdout.read()) |
89,228 | Calling an external command | Calling an external command "echo Hello World" | print(os.popen('echo Hello World').read()) |
89,228 | Calling an external command | Calling an external command "echo Hello World" | return_code = subprocess.call('echo Hello World', shell=True) |
89,228 | Calling an external command | Calling an external command "ls" | p = subprocess.Popen('ls', shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
for line in p.stdout.readlines():
print(line, end=' ')
retval = p.wait() |
89,228 | Calling an external command | Calling an external command "ls -l" | call(['ls', '-l']) |
16,566,069 | Url decode UTF-8 in Python | decode url `url` with utf8 and print it | print(urllib.parse.unquote(url).decode('utf8')) |
16,566,069 | Url decode UTF-8 in Python | decode a urllib escaped url string `url` with `utf8` | url = urllib.parse.unquote(url).decode('utf8') |
14,750,675 | Delete letters from string | delete letters from string '12454v' | """""".join(filter(str.isdigit, '12454v')) |
25,292,838 | applying regex to a pandas dataframe | Update row values for a column `Season` using vectorized string operation in pandas | df['Season'].str.split('-').str[0].astype(int) |
8,459,231 | Sort tuples based on second parameter | sort a list of tuples `my_list` by second parameter in the tuple | my_list.sort(key=lambda x: x[1]) |
4,664,850 | Find all occurrences of a substring in Python | find indexes of all occurrences of a substring `tt` in a string `ttt` | [m.start() for m in re.finditer('(?=tt)', 'ttt')] |
4,664,850 | Find all occurrences of a substring in Python | find all occurrences of a substring in a string | [m.start() for m in re.finditer('test', 'test test test test')] |
35,005,907 | re.split with spaces in python | split string `s` based on white spaces | re.findall('\\s+|\\S+', s) |
18,071,222 | Working with set_index in Pandas DataFrame | set columns `['race_date', 'track_code', 'race_number']` as indexes in dataframe `rdata` | rdata.set_index(['race_date', 'track_code', 'race_number']) |
13,571,134 | recursively go through all subdirectories and read files | recursively go through all subdirectories and files in `rootdir` | for (root, subFolders, files) in os.walk(rootdir):
pass |
652,291 | sorting a list of dictionary values by date in python | sort a list of dictionary values by 'date' in reverse order | list.sort(key=lambda item: item['date'], reverse=True) |
24,076,297 | How to truncate a string using str.format in Python? | display first 5 characters of string 'aaabbbccc' | """{:.5}""".format('aaabbbccc') |
14,961,562 | How do I convert a string of hexadecimal values to a list of integers? | unpack hexadecimal string `s` to a list of integer values | struct.unpack('11B', s) |
176,918 | Finding the index of an item given a list containing it in Python | finding the index of an item 'foo' given a list `['foo', 'bar', 'baz']` containing it | [i for i, j in enumerate(['foo', 'bar', 'baz']) if j == 'foo'] |
104,420 | How to generate all permutations of a list in Python | generate all permutations of list `[1, 2, 3]` and list `[4, 5, 6]` | print(list(itertools.product([1, 2, 3], [4, 5, 6]))) |
104,420 | How to generate all permutations of a list in Python | generate all permutations of a list `[1, 2, 3]` | itertools.permutations([1, 2, 3]) |
11,066,400 | Remove punctuation from Unicode formatted strings | substitute occurrences of unicode regex pattern u'\\p{P}+' with empty string '' in string `text` | return re.sub('\\p{P}+', '', text) |
2,052,390 | manually throw/raise an exception | manually throw/raise a `ValueError` exception with the message 'A very specific bad thing happened' | raise ValueError('A very specific bad thing happened') |
2,052,390 | Manually raising (throwing) an exception | throw an exception "I know Python!" | raise Exception('I know Python!') |
2,052,390 | Manually raising (throwing) an exception | Manually throw an exception "I know python!" | raise Exception('I know python!') |
2,052,390 | Manually raising (throwing) an exception | throw a ValueError with message 'represents a hidden bug, do not catch this' | raise ValueError('represents a hidden bug, do not catch this') |
2,052,390 | Manually raising (throwing) an exception | throw an Exception with message 'This is the exception you expect to handle' | raise Exception('This is the exception you expect to handle') |
2,052,390 | Manually raising (throwing) an exception | throw a value error with message 'A very specific bad thing happened', 'foo', 'bar', 'baz' | raise ValueError('A very specific bad thing happened') |
2,052,390 | Manually raising (throwing) an exception | throw a runtime error with message 'specific message' | raise RuntimeError('specific message') |
2,052,390 | Manually raising (throwing) an exception | throw an assertion error with message "Unexpected value of 'distance'!", distance | raise AssertionError("Unexpected value of 'distance'!", distance) |
7,732,125 | Clear text from textarea with selenium | if Selenium textarea element `foo` is not empty, clear the field | driver.find_element_by_id('foo').clear() |
7,732,125 | Clear text from textarea with selenium | clear text from textarea 'foo' with selenium | driver.find_element_by_id('foo').clear() |
9,590,965 | Convert an IP string to a number and vice versa | convert a number 2130706433 to ip string | socket.inet_ntoa(struct.pack('!L', 2130706433)) |
12,329,853 | How to rearrange Pandas column sequence? | Rearrange the columns 'a','b','x','y' of pandas DataFrame `df` in mentioned sequence 'x' ,'y','a' ,'b' | df = df[['x', 'y', 'a', 'b']] |
19,205,916 | How to call Base Class's __init__ method from the child class? | call base class's __init__ method from the child class `ChildClass` | super(ChildClass, self).__init__(*args, **kwargs) |
4,880,960 | Sum of all values in a Python dict | sum of all values in a python dict `d` | sum(d.values()) |
4,880,960 | Sum of all values in a Python dict | null | sum(d.values()) |
14,661,051 | Convert Python dictionary to JSON array | convert python dictionary `your_data` to json array | json.dumps(your_data, ensure_ascii=False) |
23,638,638 | numpy array assignment using slicing | assign an array of floats in range from 0 to 100 to a variable `values` | values = np.array([i for i in range(100)], dtype=np.float64) |
35,078,261 | Sort a list of dictionary provided an order | sort a list of dictionaries `list_of_dct` by values in an order `order` | sorted(list_of_dct, key=lambda x: order.index(list(x.values())[0])) |
4,223,923 | how to change the case of first letter of a string? | change the case of the first letter in string `s` | return s[0].upper() + s[1:] |
2,597,932 | how to change [1,2,3,4] to '1234' using python | join list of numbers `[1,2,3,4] ` to string of numbers. | """""".join([1, 2, 3, 4]) |
26,541,968 | Delete every non utf-8 symbols froms string | delete every non `utf-8` characters from a string `line` | line = line.decode('utf-8', 'ignore').encode('utf-8') |
33,065,588 | How to execute a command in the terminal from a Python script? | execute a command `command ` in the terminal from a python script | os.system(command) |
775,296 | Python MySQL Parameterized Queries | MySQL execute query 'SELECT * FROM foo WHERE bar = %s AND baz = %s' with parameters `param1` and `param2` | c.execute('SELECT * FROM foo WHERE bar = %s AND baz = %s', (param1, param2)) |
5,868,374 | Convert a string to datetime object in python | Parse string `datestr` into a datetime object using format pattern '%Y-%m-%d' | dateobj = datetime.datetime.strptime(datestr, '%Y-%m-%d').date() |