Datasets:

neulab

/

conala

like 56

Pandas: How can I remove duplicate rows from DataFrame and calculate their frequency?

remove duplicate rows from dataframe `df1` and calculate their frequency

df1.groupby(['key', 'year']).size().reset_index()

How do I iterate over a Python dictionary, ordered by values?

sort dictionary `dictionary` in ascending order by its values

sorted(list(dictionary.items()), key=operator.itemgetter(1))

How do I iterate over a Python dictionary, ordered by values?

Iterate over dictionary `d` in ascending order of values

sorted(iter(d.items()), key=lambda x: x[1])

How do I iterate over a Python dictionary, ordered by values?

iterate over a python dictionary, ordered by values

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

How to split 1D array into 2D array in NumPy by splitting the array at the last element?

split 1d array `a` into 2d array at the last element

np.split(a, [-1])

Python pandas - grouping by and summarizing on a field

convert dataframe `df` into a pivot table using column 'order' as index and values of column 'sample' as columns

df.pivot(index='order', columns='sample')

selecting across multiple columns with python pandas?

select all rows from pandas DataFrame 'df' where the value in column 'A' is greater than 1 or less than -1 in column 'B'.

df[(df['A'] > 1) | (df['B'] < -1)]

Zip with list output instead of tuple

Get the zip output as list from the lists `[1, 2, 3]`, `[4, 5, 6]`, `[7, 8, 9]`

[list(a) for a in zip([1, 2, 3], [4, 5, 6], [7, 8, 9])]

Select rows from a DataFrame based on values in a column in pandas

select rows of dataframe `df` whose value for column `A` is `foo`

print(df.loc[df['A'] == 'foo'])

Select rows from a DataFrame based on values in a column in pandas

select rows whose column value in column `column_name` does not equal `some_value` in pandas data frame

df.loc[df['column_name'] != some_value]

Select rows from a DataFrame based on values in a column in pandas

select rows from a dataframe `df` whose value for column `column_name` is not in `some_values`

df.loc[~df['column_name'].isin(some_values)]

Select rows from a DataFrame based on values in a column in pandas

select all rows whose values in a column `column_name` equals a scalar `some_value` in pandas data frame object `df`

df.loc[df['column_name'] == some_value]

Select rows from a DataFrame based on values in a column in pandas

Select rows whose value of the "B" column is "one" or "three" in the DataFrame `df`

print(df.loc[df['B'].isin(['one', 'three'])])

How to repeat individual characters in strings in Python

repeat every character for 7 times in string 'map'

"""""".join(map(lambda x: x * 7, 'map'))

Delete a file or folder

delete an empty directory

os.rmdir()

Delete a file or folder

recursively delete all contents in directory `path`

shutil.rmtree(path, ignore_errors=False, onerror=None)

Delete a file or folder

recursively remove folder `name`

os.removedirs(name)

How to add an extra row to a pandas dataframe

Add row `['8/19/2014', 'Jun', 'Fly', '98765']` to dataframe `df`

df.loc[len(df)] = ['8/19/2014', 'Jun', 'Fly', '98765']

listing files from a directory using glob python

list all files in a current directory

glob.glob('*')

listing files from a directory using glob python

List all the files that doesn't contain the name `hello`

glob.glob('[!hello]*.txt')

listing files from a directory using glob python

List all the files that matches the pattern `hello*.txt`

glob.glob('hello*.txt')

test a boolean expression in a Python string

evaluate the expression '20<30'

eval('20<30')

Python copy a list of lists

Copy list `old_list` and name it `new_list`

new_list = [x[:] for x in old_list]

Convert scientific notation to decimal - python

convert scientific notation of variable `a` to decimal

"""{:.50f}""".format(float(a[0] / a[1]))

How to remove 0's converting pandas dataframe to record

convert dataframe `df` to integer-type sparse object

df.to_sparse(0)

python - readable list of objects

display attribute `attr` for each object `obj` in list `my_list_of_objs`

print([obj.attr for obj in my_list_of_objs])

get count of values associated with key in dict python

count the number of True values associated with key 'success' in dictionary `d`

sum(1 if d['success'] else 0 for d in s)

get count of values associated with key in dict python

get the sum of values associated with the key ‘success’ for a list of dictionaries `s`

sum(d['success'] for d in s)

get path from a module name

get complete path of a module named `os`

imp.find_module('os')[1]

get the logical xor of two variables

get logical xor of `a` and `b`

(bool(a) != bool(b))

get the logical xor of two variables

get logical xor of `a` and `b`

((a and (not b)) or ((not a) and b))

get the logical xor of two variables

get logical xor of `a` and `b`

(bool(a) ^ bool(b))

get the logical xor of two variables

get logical xor of `a` and `b`

xor(bool(a), bool(b))

get the logical xor of two variables

get the logical xor of two variables `str1` and `str2`

return (bool(str1) ^ bool(str2))

How to alphabetically sort array of dictionaries on single key?

Sort list `my_list` in alphabetical order based on the values associated with key 'name' of each dictionary in the list

my_list.sort(key=operator.itemgetter('name'))

Python: Split string by list of separators

split a string `a , b; cdf` using both commas and semicolons as delimeters

re.split('\\s*,\\s*|\\s*;\\s*', 'a , b; cdf')

Python: Split string by list of separators

Split a string `string` by multiple separators `,` and `;`

[t.strip() for s in string.split(',') for t in s.split(';')]

lambda in python

make a function `f` that calculates the sum of two integer variables `x` and `y`

f = lambda x, y: x + y

Creating a list of objects in Python

Create list `instancelist` containing 29 objects of type MyClass

instancelist = [MyClass() for i in range(29)]

Python 2.7: making a dictionary object from a specially-formatted list object

Make a dictionary from list `f` which is in the format of four sets of "val, key, val"

{f[i + 1]: [f[i], f[i + 2]] for i in range(0, len(f), 3)}

Shortest way to convert these bytes to int in python?

convert bytes string `s` to an unsigned integer

struct.unpack('>q', s)[0]

How can I concatenate a Series onto a DataFrame with Pandas?

concatenate a series `students` onto a dataframe `marks` with pandas

pd.concat([students, pd.DataFrame(marks)], axis=1)

Custom Python list sorting

Sort list `alist` in ascending order based on each of its elements' attribute `foo`

alist.sort(key=lambda x: x.foo)

How to get only div with id ending with a certain value in Beautiful Soup?

BeautifulSoup select 'div' elements with an id attribute value ending with sub-string '_answer' in HTML parsed string `soup`

soup.select('div[id$=_answer]')

How can I solve system of linear equations in SymPy?

sympy solve matrix of linear equations `(([1, 1, 1, 1], [1, 1, 2, 3]))` with variables `(x, y, z)`

linsolve(Matrix(([1, 1, 1, 1], [1, 1, 2, 3])), (x, y, z))

best way to extract subset of key-value pairs from python dictionary object

best way to extract subset of key-value pairs with keys matching 'l', 'm', or 'n' from python dictionary object

{k: bigdict[k] for k in list(bigdict.keys()) & {'l', 'm', 'n'}}

best way to extract subset of key-value pairs from python dictionary object

extract subset of key-value pairs with keys as `('l', 'm', 'n')` from dictionary object `bigdict`

dict((k, bigdict[k]) for k in ('l', 'm', 'n'))

best way to extract subset of key-value pairs from python dictionary object

Get items from a dictionary `bigdict` where the keys are present in `('l', 'm', 'n')`

{k: bigdict.get(k, None) for k in ('l', 'm', 'n')}

best way to extract subset of key-value pairs from python dictionary object

Extract subset of key value pair for keys 'l', 'm', 'n' from `bigdict` in python 3

{k: bigdict[k] for k in ('l', 'm', 'n')}

Get contents of entire page using Selenium

Selenium get the entire `driver` page text

driver.page_source

Extracting specific columns in numpy array

extracting column `1` and `9` from array `data`

data[:, ([1, 9])]

Remove string between 2 characters from text string

remove all square brackets from string 'abcd[e]yth[ac]ytwec'

re.sub('\\[.*?\\]', '', 'abcd[e]yth[ac]ytwec')

How can I resize the root window in Tkinter?

root.geometry('500x500')

How to capture the entire string while using 'lookaround' with chars in regex?

find all substrings in string `mystring` composed only of letters `a` and `b` where each `a` is directly preceded and succeeded by `b`

re.findall('\\b(?:b+a)+b+\\b', mystring)

in Python, how to convert list of float numbers to string with certain format?

convert list `lst` of tuples of floats to list `str_list` of tuples of strings of floats in scientific notation with eight decimal point precision

str_list = [tuple('{0:.8e}'.format(flt) for flt in sublist) for sublist in lst]

in Python, how to convert list of float numbers to string with certain format?

convert list of sublists `lst` of floats to a list of sublists `str_list` of strings of integers in scientific notation with 8 decimal points

str_list = [['{0:.8e}'.format(flt) for flt in sublist] for sublist in lst]

Getting the first elements per row in an array in Python?

Create a tuple `t` containing first element of each tuple in tuple `s`

t = tuple(x[0] for x in s)

How to obtain the day of the week in a 3 letter format from a datetime object in python?

obtain the current day of the week in a 3 letter format from a datetime object

datetime.datetime.now().strftime('%a')

get the <a href="http://en.wikipedia.org/wiki/ASCII" rel="nofollow noreferrer">ASCII</a> value of a character as an int

get the ASCII value of a character 'a' as an int

ord('a')

get the <a href="http://en.wikipedia.org/wiki/ASCII" rel="nofollow noreferrer">ASCII</a> value of a character as an int

get the ASCII value of a character u'あ' as an int

ord('\u3042')

get the <a href="http://en.wikipedia.org/wiki/ASCII" rel="nofollow noreferrer">ASCII</a> value of a character as an int

get the ASCII value of a character as an int

ord()

decode JSON

decode JSON string `u` to a dictionary

json.load(u)

Deleting mulitple columns in Pandas

Delete mulitple columns `columnheading1`, `columnheading2` in pandas data frame `yourdf`

yourdf.drop(['columnheading1', 'columnheading2'], axis=1, inplace=True)

How to read formatted input in python?

get a list of of elements resulting from splitting user input by commas and stripping white space from each resulting string `s`

[s.strip() for s in input().split(',')]

Convert binary to list of digits Python

create a list containing the digits values from binary string `x` as elements

[int(d) for d in str(bin(x))[2:]]

How to get a max string length in nested lists

get the max string length in list `i`

max(len(word) for word in i)

How to get a max string length in nested lists

get the maximum string length in nested list `i`

len(max(i, key=len))

Python: How to Redirect Output with Subprocess?

execute os command `my_cmd`

os.system(my_cmd)

How do I sort a list of strings in Python?

sort list `mylist` alphabetically

mylist.sort(key=lambda x: x.lower())

How do I sort a list of strings in Python?

sort list `mylist` in alphabetical order

mylist.sort(key=str.lower)

How do I sort a list of strings in Python?

sort a list of strings 'mylist'.

mylist.sort()

How do I sort a list of strings in Python?

sort a list of strings `list`

list.sort()

set multi index of an existing data frame in pandas

Set multi index on columns 'Company' and 'date' of data frame `df` in pandas.

df.set_index(['Company', 'date'], inplace=True)

How can I use a string with the same name of an object in Python to access the object itself?

get the attribute `x` from object `your_obj`

getattr(your_obj, x)

Remove the first word in a Python string?

remove first word in string `s`

s.split(' ', 1)[1]

How to save Xlsxwriter file in certain path?

save xlsxwriter file in 'app/smth1/smth2/Expenses01.xlsx' path and assign to variable `workbook`

workbook = xlsxwriter.Workbook('app/smth1/smth2/Expenses01.xlsx')

How to save Xlsxwriter file in certain path?

save xlsxwriter file to 'C:/Users/Steven/Documents/demo.xlsx' path

workbook = xlsxwriter.Workbook('C:/Users/Steven/Documents/demo.xlsx')

How to change legend size with matplotlib.pyplot

change legend size to 'x-small' in upper-left location

pyplot.legend(loc=2, fontsize='x-small')

How to change legend size with matplotlib.pyplot

change legend font size with matplotlib.pyplot to 6

plot.legend(loc=2, prop={'size': 6})

How do you split a list into evenly sized chunks?

split list `l` into `n` sized lists

[l[i:i + n] for i in range(0, len(l), n)]

How do you split a list into evenly sized chunks?

split a list `l` into evenly sized chunks `n`

[l[i:i + n] for i in range(0, len(l), n)]

How to check if character exists in DataFrame cell

check if character '-' exists in a dataframe `df` cell 'a'

df['a'].str.contains('-')

Python Regex - Remove special characters but preserve apostraphes

remove all non -word, -whitespace, or -apostrophe characters from string `doesn't this mean it -technically- works?`

re.sub("[^\\w' ]", '', "doesn't this mean it -technically- works?")

find all digits between a character in python

find all digits between two characters `\xab` and `\xbb`in a string `text`

print(re.findall('\\d+', '\n'.join(re.findall('\xab([\\s\\S]*?)\xbb', text))))

Use index in pandas to plot data

plot data of column 'index' versus column 'A' of dataframe `monthly_mean` after resetting its index

monthly_mean.reset_index().plot(x='index', y='A')

How to get data from command line from within a Python program?

get the output of a subprocess command `echo "foo"` in command line

subprocess.check_output('echo "foo"', shell=True)

Easy way to convert a unicode list to a list containing python strings?

Encode each value to 'UTF8' in the list `EmployeeList`

[x.encode('UTF8') for x in EmployeeList]

pandas: combine two columns in a DataFrame

combine two columns `foo` and `bar` in a pandas data frame

pandas.concat([df['foo'].dropna(), df['bar'].dropna()]).reindex_like(df)

How can I generate a list of consecutive numbers?

generate a list of consecutive integers from 0 to 8

list(range(9))

How to make a Python string out of non-ascii "bytes"

convert list `myintegers` into a unicode string

"""""".join(chr(i) for i in myintegers)

Using inheritance in python

inherit from class `Executive`

super(Executive, self).__init__(*args)

Removing items from unnamed lists in Python

Remove the string value `item` from a list of strings `my_sequence`

[item for item in my_sequence if item != 'item']

randomly select an item from a list

randomly select an item from list `foo`

random.choice(foo)

Python Check if all of the following items is in a list

check if all of the following items in list `['a', 'b']` are in a list `['a', 'b', 'c']`

set(['a', 'b']).issubset(['a', 'b', 'c'])

Python Check if all of the following items is in a list

Check if all the items in a list `['a', 'b']` exists in another list `l`

set(['a', 'b']).issubset(set(l))

pass a string into subprocess.Popen

set the stdin of the process 'grep f' to be b'one\ntwo\nthree\nfour\nfive\nsix\n'

p = Popen(['grep', 'f'], stdout=PIPE, stdin=PIPE, stderr=STDOUT) grep_stdout = p.communicate(input='one\ntwo\nthree\nfour\nfive\nsix\n')[0]

pass a string into subprocess.Popen

set the stdin of the process 'grep f' to be 'one\ntwo\nthree\nfour\nfive\nsix\n'

p = subprocess.Popen(['grep', 'f'], stdout=subprocess.PIPE, stdin=subprocess.PIPE) p.stdin.write('one\ntwo\nthree\nfour\nfive\nsix\n') p.communicate()[0] p.stdin.close()

Most pythonic way to convert a list of tuples

to convert a list of tuples `list_of_tuples` into list of lists

[list(t) for t in zip(*list_of_tuples)]

Most pythonic way to convert a list of tuples

group a list `list_of_tuples` of tuples by values

zip(*list_of_tuples)

simple/efficient way to expand a pandas dataframe

merge pandas dataframe `x` with columns 'a' and 'b' and dataframe `y` with column 'y'

pd.merge(y, x, on='k')[['a', 'b', 'y']]