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sorted(l, key=lambda x: (-int(x[1]), x[0]))

Sort a nested list by two elements

34705205_34705233_0

Sort a list l of tuples. Each tuple has 2 elements, and the sorting is done with respect to the second one and from the greatest to the lowest value.

[int(x) for x in str(num)]

converting integer to list in python

13905936_13905946_0

convert an integer num into a list of string digits

c.decode('unicode_escape')

Converting byte string in unicode string

13837848_13838041_0

convert a byte string c into an unicode string

mylist.sort(key=lambda d: (d['weight'], d['factor']))

Ordering a list of dictionaries in python

861190_861238_0

sort a list of dictionaries with respect to the keys 'weigth' and 'factor'.

print([l[i:i + n] for i in range(len(l)) for n in range(1, len(l) - i + 1)])

Two Combination Lists from One List

33361446_33361777_0

print a list of all the sublists of a list l.

max(min(my_value, max_value), min_value)

Clamping floating numbers in Python?

9775731_9775761_0

Return the value of a number my_value clipped between min_value and max_value

re.sub('[^A-Z]', '', s)

How to extract all UPPER from a string? Python

15886340_15886375_0

regex to remove all the upper case characters in a string s

[d['key'] for d in l]

Get a list of values from a list of dictionaries in python

25040875_25040901_0

For a list of dictionaries l, write a code snippet to return the list of values associated to the key 'key' for each of its element.

[x[1] for x in elements]

How to extract the n-th elements from a list of tuples in python?

3308102_3308117_0

Extract the list of second elements from a list of tuples elements

list.sort(key=lambda item: item['date'], reverse=True)

sorting a list of dictionary values by date in python

652291_652347_0

Reverse sort a list of dictionary list with respect to the value of the key 'date'.

[i for i, e in enumerate(a) if e != 0]

How do I get a list of indices of non zero elements in a list?

4111412_4111417_0

Get the list of indices of non zero elements in the list a

sorted(the_list, key=lambda x: int(x.split('_')[1]))

Sort list of strings by integer suffix in python

4287209_4287233_0

Sort a list of strings the_list with respect to the value of the suffix after the character '_'

r = int(''.join(map(str, x)))

How to convert a list of multiple integers into a single integer?

41067960_41067989_0

Convert a list of integers x into a string r

df['a'] = df['a'].apply(lambda x: x + 1)

Pandas: How can I use the apply() function for a single column?

34962104_34962199_0

Use the function apply to increment the values of the column 'a' of a pandas DataFrame df

{k: v for d in L for k, v in list(d.items())}

How do I merge a list of dicts into a single dict?

3494906_3495395_0

Merge a list of dictionaries L into a single dictionary

a.sort(key=lambda x: b.index(x))

How to sort a list according to another list?

12814667_12814719_0

Sort a list of elements a with respect to the index in a list b

li1.sort(key=lambda x: not x.startswith('b.'))

What is the best way to sort list with custom sorting parameters in Python?

7996940_7997011_0

Sort a list of strings li1 such that those starting with 'b.' come first.

int(num)

Python: Convert a string to an integer

2508861_2508940_0

convert a string num into an integer

[int(s[i:i + 3], 2) for i in range(0, len(s), 3)]

Convert binary string to list of integers using Python

1386811_1386828_0

Given a binary string s, divide it into blocks of size 3 and return a list containing the decimal value corresponding to each block.

indices = [i for i, x in enumerate(my_list) if x == 'whatever']

How to find all occurrences of an element in a list?

6294179_6294205_0

Given a list of string s, build the list of indices corresponding to the string 'whatever'.

sorted(list(data.items()), key=lambda x: x[1])

sort dict by value python

16772071_16772088_0

Sort the items of the dictionary data by value

df.sort_values(by='Date')

Sort Pandas Dataframe by Date

28161356_28161433_0

Sort a DataFrame df by the value of the column 'Date'

print(' '.join(set(s)))

How does this function to remove duplicate characters from a string in python work?

29360607_29360674_0

print the string obtained by removing all the duplicate in a string s.

[x for x in my_list if not x.startswith('#')]

What is the most pythonic way to exclude elements of a list that start with a specific character?

11791568_11791601_0

Remove the elements that start with '#' in the list my_list.

newstr = oldstr.replace('M', '')

How to delete a character from a string using python?

3559559_3559600_0

Delete all the occurrence of the character 'M' in oldstr and store the result in the variable newstr.

sum(d.values())

Sum of all values in a Python dict

4880960_4880971_0

Sum all the values of a python dict d

pandas.concat([df1, df2], axis=1)

Combine two Pandas dataframes with the same index

28773683_28773733_0

Combine 2 pandas dataframes df1 and df2 with the same index.

list(s)

How do I convert user input into a list?

35582959_35582986_0

Convert a string s into a list of characters.

int(s.split('.')[0])

Convert a string to integer with decimal in Python

1094717_1094721_0

Convert a string s representing representing a decimal number to an integer.

[(x, y) for x, y in a if x == 1]

Find an element in a list of tuples

2191699_2191712_0

Given a list of 2D tuples a, return the list of tuples for whom the first element is equal to 1.

len(li) - 1 - li[::-1].index('a')

How to find the last occurrence of an item in a Python list

6890170_6890255_0

Find the index of the last occurrence of 'a' in the string li.

xs.sort(key=lambda s: len(s))

Sorting Python list based on the length of the string

2587402_2587419_0

Sort a list of strings xs based on the length.

len(set(mylist)) == 1

How do I check if all elements in a list are the same?

22240602_22240612_0

Check if all the elements of the list mylist are the same.

hex(ord(c))

convert string to hex in python

21669374_21669393_0

Convert the char c into hex

[len(x) for x in s.split()]

How to get the length of words in a sentence?

22749706_22749723_0

Get the length of each word in a sentence s

[(k, v) for k, v in a.items()]

How can I convert a Python dictionary to a list of tuples?

674519_674536_0

Convert a Python dictionary a into a list of tuples

my_list[-10:]

Python - How to extract the last x elements from a list

8556076_8556080_0

Extract the last 10 elements of the python list my_list

itertools.permutations(s)

How to generate all permutations of a list in Python

104420_104471_0

Get all the permutations of a list s in python.

sum(your_list)

Summing elements in a list

11344827_11344839_0

Sum elements of a list your_list

df['a'].tolist()

Pandas DataFrame to list

23748995_23749057_0

Return the values of the column 'a' of the pandas DataFrame df into a list

df.dropna(subset=['city', 'latitude', 'longitude'], how='all')

Delete row based on nulls in certain columns (pandas)

42125131_42125197_0

Delete null in the columns 'city', 'longitude' and 'latitude' of the dataframe df.

[k for k, v in dictA.items() if v.count('duck') > 1]

Counting values in dictionary

14743454_14743473_0

Given a dictionary dictA return the list of keys whose values contain at least 2 occurrences of 'duck'

sum(map(lambda x: x * x, l))

sum of squares in a list in one line?

26894227_26894268_0

Sum of squares in the list l

all(isinstance(x, int) for x in lst)

Python check if all elements of a list are the same type

13252333_13252348_1

Check if all elements of a list lst are of type int.

isinstance(s, str)

How to check if type of a variable is string?

4843173_4843178_0

Check if a variable s is a string.

mystring.split(',')

How can I split this comma-delimited string in Python?

5864485_5864507_0

Split the string mystring by comma

f = open('example.txt', 'r')

How do I print the content of a .txt file in Python?

18256363_18256476_1

Read a .txt file example.txt and store it into the variable f

datetime.datetime.today().strftime('%Y-%m-%d')

Getting today's date in YYYY-MM-DD in Python?

32490629_32490661_0

Getting today's date in YYYY-MM-DD in Python with datetime

datetime.datetime.now() - datetime.timedelta(days=1)

How to get yesterday in python

19779790_19779811_0

How to get yesterday's data in python with datetime?

instance.__class__.__name__

How to get the concrete class name as a string?

521502_521510_0

Given an object named instance of a given class, get the class name as a string

max(abs(x - y) for x, y in zip(values[1:], values[:-1]))

Finding the largest delta between two integers in a list in python

3428769_3428785_0

Find the largest delta between two integers in the list values in python

df.to_xml('foo.xml')

How do convert a pandas/dataframe to XML?

18574108_18579083_0

Save the content of the pandas dataframe df into a file 'foo.xml'.

s.replace(' ', '')

How to strip all whitespace from string

3739909_3739939_0

Strip all whitespace from a string s

[line for line in open('text.txt') if 'apple' in line]

Python: Filter lines from a text file which contain a particular word

5245058_5245216_0

read the file 'text.txt' and store all the lines which contain the word 'apple' in a list.

df.drop(['col1', 'col2'], axis=1, inplace=True)

Deleting mulitple columns in Pandas

28538536_37069701_0

Delete columns 'col1' and 'col2' from pandas dataframe df.

np.savetxt('test.txt', data)

Write multiple numpy arrays to file

3419082_3419189_0

Save the numpy array data into a file 'test.txt'.

df.set_index('month')

Python Pandas - Date Column to Column index

15752422_15752582_0

Find common elements to 2 lists x and y.

np.isnan(a).sum()

How to calculate percentage of sparsity for a numpy array/matrix?

38708621_38709042_0

Find the number of NaN values in a numpy array a.

os.listdir(path)

How can I list the contents of a directory in Python?

2759323_2759331_0

List the content of a directory given its path path.

a = a[-1:] + a[:-1]

How do I move the last item in a list to the front in python?

6490560_6490586_0

Move the last item of the list a to the front in python

arr[arr != 0].min()

How to find the minimum value in a numpy matrix?

11764260_11764285_0

Minimum non zero element in the numpy matrix arr

x = [[] for i in range(3)]

Python initializing a list of lists

12791501_12791510_0

Create an list of 3 empty lists and store it in the variable x

set(a).intersection(b)

compare if an element exists in two lists

14352621_14352657_0

Find the set of elements that are common to two lists a and b

Y = X - X.mean(axis=1).reshape(-1, 1)

subtracting the mean of each row in numpy with broadcasting

32030343_32030456_0

Subtract the mean of each row from a numpy array X with broadcasting and store the result in a matrix Y.

del l[-n:]

Remove the last N elements of a list

15715912_15716103_0

Delete the last n elements of a list l

a.insert(0, a.pop())

How do I move the last item in a list to the front in python?

6490560_6490608_0

Given a python list a, move its last item to the front.

s.find('r')

How to get the position of a character in Python?

2294493_2294510_0

Find the position of the character 'r' in the string s.

print(s[1:])

Remove the first character of a string

4945548_4945558_0

print the string s but ommit the first character.

math.sqrt(x)

How to calc square root in python?

9595135_9595161_0

compute the square root of x by using the module math.

[s[i:i + 2] for i in range(0, len(s), 2)]

Splitting a string into 2-letter segments

12491537_12491575_0

Split the string s into a list of 2-letter segments with contiguous letters.

a = set()

python: append values to a set

3392354_31972583_1

Create a variable a and initialize it as an empty set.

chr(ord('a') + i)

How could I print out the nth letter of the alphabet in Python?

1724473_1724485_0

Given an index i such that 0 <= i < 26, how to find the letter of the alphabet with that index?

e / e.sum(axis=1, keepdims=True)

numpy divide row by row sum

16202348_16202486_0

Divide each row of a numpy array e by the row's sum.

print('Hello, world!')

How do I create a webpage with buttons that invoke various Python scripts on the system serving the webpage?

448837_448901_0

Print 'Hello, world' in python.

numpy.linalg.lstsq(a, b)

Is there a python module to solve linear equations?

6789927_9262736_0

Use numpy to computes the vector x that solves the equation ax = b

a.shape

size of NumPy array

11125429_11125452_0

Get the shape of a numpy array a.

dict(y, **x)

Union of dict objects in Python

9819602_9819617_1

Merge 2 dictionnaries x and y.

np.multiply(a, b)

How to get element-wise matrix multiplication (Hadamard product) in numpy?

40034993_40035266_1

Write the element-wise matrix multiplication (Hadamard product) of 2 numpy arrays a and b.

(s + mystring for s in mylist)

Appending the same string to a list of strings in Python

2050637_2050649_1

Given a list of strings stored as the variable mylist, append to each of its element the string mystring.

s[-1].isdigit()

Python - Check if the last characters in a string are numbers

14471177_14471204_0

Check is the last element of the string s is a digit.

width, height = img.size

How do I get the picture size with PIL?

6444548_34704661_1

Get the width and the height of the image image with the help of PIL.

name += ' ' * (length - len(name))

How to pad a string to a fixed length with spaces in Python?

20309255_20309271_0

Pad the string name to length with spaces in Python.

def square(arr): return [(i ** 2) for i in arr]

Squaring all elements in a list

12555443_12555492_2

Write a function square_list which takes a list arr as argument and return the list obtained by squaring each of its elements.

try : my_dict[k] += 1 except : my_dict[k] = 1

Check if a given key already exists in a dictionary and increment it

473099_473108_0

Given a dictionary my_dict, increment of the value of the key k if it exists. Otherwise set it to 1.

d = dict(l)

Creating a Dictionary from a List of 2-Tuples

6072470_6072496_0

Create a dictionary d from a list of 2-Tuples l.

json.dumps(my_dict)

Convert Python dictionary to JSON array

14661051_14661482_1

Convert the python dictionary my_dict to a JSON array.

len(df.columns)

Python pandas dataframe: retrieve number of columns

20297332_20297639_0

Get the number of columns of a pandas dataframe df.

(np.abs(x) + x) / 2

How to implement the ReLU function in Numpy

32109319_32109519_0

How to compute ReLU(x) where x is a numpy array?

scipy.sparse.csr_matrix([column['rating'], column['user'], column['movie']])

How to create a ratings csr_matrix in scipy?

40587251_40587319_0

You are given a pandas dataframe column. Use scipy to build a csr_matrix out of the columns 'rating', 'user' and 'movie'.

print(random.choice(words))

Return a random word from a word list in python

1456617_1456645_0

Given a list of string words, choose randomly one of them by using the module random in python.

df.fillna(method='ffill', inplace=True)

How to replace NaNs by preceding values in pandas DataFrame?

27905295_27905350_0

Replace NaNs in the pandas dataframe df by using preceding values. Do it in place.

df.to_xml('foo.xml')

How do convert a pandas/dataframe to XML?

18574108_18579083_0

Save the pandas dataframe df in a xml file 'foo.xml'.

X_train = scaler.fit(X_train).transform(X_train)

How to apply standardization to SVMs in scikit-learn?

14688391_14693358_0

With scikit-learn you have an variable scaler that is a StandardScaler, used it to apply standardization to the matrix X_train.

df['a'].tolist()

Pandas DataFrame to list

23748995_23749057_0

Convert the column 'a' of the pandas dataframe df to a python list.

sum(x * y for x, y in list(zip(a, b)))

How can I sum the product of two list items using for loop in python?

41821112_41821169_0

Sum the product of 2 list items x and y which have the same length.

numpy.prod(a)

How can I get the product of all elements in a one dimensional numpy array

5349570_5349616_0

Get the product of all elements in a one dimensional numpy array a.

dist = sqrt((x2 - x1) ** 2 + (y2 - y1) ** 2)

How do I find the distance between two points?

5228383_5228392_0

You have 2 points (x1, y1) and (x2, y2) in 2D, compute the distance between them.

np.hstack([X, Y])

joining two numpy matrices

12246680_12246720_0

Merge two numpy arrays X and Y horizontally.

scipy.sparse.csr_matrix(df.values)

Convert Pandas dataframe to Sparse Numpy Matrix directly

20459536_20459839_0

Convert pandas dataframe df to scipy sparse matrix.

max(n for n in range(1000) if str(n) == str(n)[::-1] and is_prime(n))

Max Prime Palindrome in Python

29774964_29776004_0

You are provided with a function is_prime which takes a number as input and return True if it is prime and False otherwise. Return the biggest number < 1000 which is a prime numnber and a palindrome.