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Retrieving python module path

get the path of the current python module

print(os.getcwd())

Retrieving python module path

get the path of the python module `amodule`

path = os.path.abspath(amodule.__file__)

Padding a list in python with particular value

fill list `myList` with 4 0's

self.myList.extend([0] * (4 - len(self.myList)))

Fastest Way to Drop Duplicated Index in a Pandas DataFrame

drop duplicate indexes in a pandas data frame `df`

df[~df.index.duplicated()]

Is there a more pythonic way of exploding a list over a function's arguments?

unpack elements of list `i` as arguments into function `foo`

foo(*i)

Generate list of numbers in specific format

generate list of numbers in specific format using string formatting precision.

[('%.2d' % i) for i in range(16)]

Summarizing a dictionary of arrays in Python

sort dictionary `mydict` in descending order based on the sum of each value in it

sorted(iter(mydict.items()), key=lambda tup: sum(tup[1]), reverse=True)[:3]

Summarizing a dictionary of arrays in Python

get top `3` items from a dictionary `mydict` with largest sum of values

heapq.nlargest(3, iter(mydict.items()), key=lambda tup: sum(tup[1]))

get index of character in python list

get index of character 'b' in list '['a', 'b']'

['a', 'b'].index('b')

How to set font size of Matplotlib axis Legend?

set font size of axis legend of plot `plt` to 'xx-small'

plt.setp(legend.get_title(), fontsize='xx-small')

Python: Convert a string to an integer

int(' 23 ')

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

extract the 2nd elements from a list of tuples

[x[1] for x in elements]

getting the opposite diagonal of a numpy array

get the opposite diagonal of a numpy array `array`

np.diag(np.rot90(array))

Convert list of tuples to list?

flatten list of tuples `a`

list(chain.from_iterable(a))

Removing white space from txt with python

substitute two or more whitespace characters with character '|' in string `line`

re.sub('\\s{2,}', '|', line.strip())

Limiting floats to two decimal points

print float `a` with two decimal points

print(('%.2f' % a))

Limiting floats to two decimal points

print float `a` with two decimal points

print(('{0:.2f}'.format(a)))

Limiting floats to two decimal points

print float `a` with two decimal points

print(('{0:.2f}'.format(round(a, 2))))

Limiting floats to two decimal points

print float `a` with two decimal points

print(('%.2f' % round(a, 2)))

Limiting floats to two decimal points

limit float 13.9499999 to two decimal points

('%.2f' % 13.9499999)

Limiting floats to two decimal points

limit float 3.14159 to two decimal points

('%.2f' % 3.14159)

Limiting floats to two decimal points

limit float 13.949999999999999 to two decimal points

float('{0:.2f}'.format(13.95))

Limiting floats to two decimal points

limit float 13.949999999999999 to two decimal points

'{0:.2f}'.format(13.95)

How to I load a tsv file into a Pandas DataFrame?

load a tsv file `c:/~/trainSetRel3.txt` into a pandas data frame

DataFrame.from_csv('c:/~/trainSetRel3.txt', sep='\t')

How to set UTC offset for datetime?

set UTC offset by 9 hrs ahead for date '2013/09/11 00:17'

dateutil.parser.parse('2013/09/11 00:17 +0900')

Passing list of parameters to SQL in psycopg2

pass a list of parameters `((1, 2, 3),) to sql queue 'SELECT * FROM table WHERE column IN %s;'

cur.mogrify('SELECT * FROM table WHERE column IN %s;', ((1, 2, 3),))

How would I sum a multi-dimensional array in the most succinct python?

sum all elements of two-dimensions list `[[1, 2, 3, 4], [2, 4, 5, 6]]]`

sum([sum(x) for x in [[1, 2, 3, 4], [2, 4, 5, 6]]])

Access an arbitrary element in a dictionary in Python

Retrieve an arbitrary value from dictionary `dict`

next(iter(dict.values()))

Access an arbitrary element in a dictionary in Python

access an arbitrary value from dictionary `dict`

next(iter(list(dict.values())))

Pandas: aggregate based on filter on another column

group dataframe `df` by columns 'Month' and 'Fruit'

df.groupby(['Month', 'Fruit']).sum().unstack(level=0)

sorting list of tuples by arbitrary key

sort list `mylist` of tuples by arbitrary key from list `order`

sorted(mylist, key=lambda x: order.index(x[1]))

Python - Sort a list of dics by value of dict`s dict value

sort a list of dictionary `persons` according to the key `['passport']['birth_info']['date']`

sorted(persons, key=lambda x: x['passport']['birth_info']['date'])

How can I remove the fragment identifier from a URL?

remove the fragment identifier `#something` from a url `http://www.address.com/something#something`

urlparse.urldefrag('http://www.address.com/something#something')

How to download to a specific directory with Python?

download to a directory '/path/to/dir/filename.ext' from source 'http://example.com/file.ext'

urllib.request.urlretrieve('http://example.com/file.ext', '/path/to/dir/filename.ext')

removing duplicates of a list of sets

remove all duplicates from a list of sets `L`

list(set(frozenset(item) for item in L))

removing duplicates of a list of sets

remove duplicates from a list of sets 'L'

[set(item) for item in set(frozenset(item) for item in L)]

How to terminate process from Python using pid?

terminate process `p`

p.terminate()

Delete all objects in a list

delete all values in a list `mylist`

del mylist[:]

How to throw an error window in Python in Windows

throw an error window in python in windows

ctypes.windll.user32.MessageBoxW(0, 'Error', 'Error', 0)

Remove empty strings from a list of strings

remove empty strings from list `str_list`

str_list = list([_f for _f in str_list if _f])

How to remove whitespace in BeautifulSoup

remove newlines and whitespace from string `yourstring`

re.sub('[\\ \\n]{2,}', '', yourstring)

Dot notation string manipulation

remove the last dot and all text beyond it in string `s`

re.sub('\\.[^.]+$', '', s)

Removing elements from an array that are in another array

remove elements from an array `A` that are in array `B`

A[np.all(np.any(A - B[:, (None)], axis=2), axis=0)]

write to csv from DataFrame python pandas

Write column 'sum' of DataFrame `a` to csv file 'test.csv'

a.to_csv('test.csv', cols=['sum'])

call a Python script from another Python script

call a Python script "test2.py"

exec(compile(open('test2.py').read(), 'test2.py', 'exec'))

call a Python script from another Python script

call a Python script "test1.py"

subprocess.call('test1.py', shell=True)

How do I sort a zipped list in Python?

sort a zipped list `zipped` using lambda function

sorted(zipped, key=lambda x: x[1])

How do I sort a zipped list in Python?

zipped.sort(key=lambda t: t[1])

Sorting a dictionary by value then by key

sort a dictionary `y` by value then by key

sorted(list(y.items()), key=lambda x: (x[1], x[0]), reverse=True)

Using BeautifulSoup to select div blocks within HTML

using beautifulsoup to select div blocks within html `soup`

soup.find_all('div', class_='crBlock ')

Remove list of indices from a list in Python

remove elements from list `centroids` the indexes of which are in array `index`

[element for i, element in enumerate(centroids) if i not in index]

Comparing two lists in Python

list duplicated elements in two lists `listA` and `listB`

list(set(listA) & set(listB))

http file downloading and saving

download "http://randomsite.com/file.gz" from http and save as "file.gz"

testfile = urllib.request.URLopener() testfile.retrieve('http://randomsite.com/file.gz', 'file.gz')

http file downloading and saving

download file from http url "http://randomsite.com/file.gz" and save as "file.gz"

urllib.request.urlretrieve('http://randomsite.com/file.gz', 'file.gz')

http file downloading and saving

download file from http url `file_url`

file_name = wget.download(file_url)

Accented characters in Matplotlib

set an array of unicode characters `[u'\xe9', u'\xe3', u'\xe2']` as labels in Matplotlib `ax`

ax.set_yticklabels(['\xe9', '\xe3', '\xe2'])

How to get a list of all integer points in an n-dimensional cube using python?

get a list of all integer points in a `dim` dimensional hypercube with coordinates from `-x` to `y` for all dimensions

list(itertools.product(list(range(-x, y)), repeat=dim))

How can I convert a unicode string into string literals in Python 2.7?

convert unicode string `s` into string literals

print(s.encode('unicode_escape'))

python - How to format variable number of arguments into a string?

how to format a list of arguments `my_args` into a string

'Hello %s' % ', '.join(my_args)

Python regex search AND split

search and split string 'aaa bbb ccc ddd eee fff' by delimiter '(ddd)'

re.split('(ddd)', 'aaa bbb ccc ddd eee fff', 1)

Python regex search AND split

regex search and split string 'aaa bbb ccc ddd eee fff' by delimiter '(d(d)d)'

re.split('(d(d)d)', 'aaa bbb ccc ddd eee fff', 1)

Convert list of dictionaries to Dataframe

convert a list of dictionaries `d` to pandas data frame

pd.DataFrame(d)

How to split string into words that do not contain whitespaces in python?

split string "This is a string" into words that do not contain whitespaces

"""This is a string""".split()

How to split string into words that do not contain whitespaces in python?

split string "This is a string" into words that does not contain whitespaces

"""This is a string""".split()

python pandas: apply a function with arguments to a series

my_series.apply(your_function, args=(2, 3, 4), extra_kw=1)

Python: How to remove all duplicate items from a list

remove all duplicate items from a list `lseperatedOrblist`

woduplicates = list(set(lseperatedOrblist))

Sum of product of combinations in a list

sum of product of combinations in a list `l`

sum([(i * j) for i, j in list(itertools.combinations(l, 2))])

Using variables in Python regular expression

regular expression for validating string 'user' containing a sequence of characters ending with '-' followed by any number of digits.

re.compile('{}-\\d*'.format(user))

In Python, how do I convert all of the items in a list to floats?

convert all of the items in a list `lst` to float

[float(i) for i in lst]

How can I multiply all items in a list together with Python?

multiply all items in a list `[1, 2, 3, 4, 5, 6]` together

from functools import reduce reduce(lambda x, y: x * y, [1, 2, 3, 4, 5, 6])

How to write a tuple of tuples to a CSV file using Python

write a tuple of tuples `A` to a csv file using python

writer.writerow(A)

How to write a tuple of tuples to a CSV file using Python

Write all tuple of tuples `A` at once into csv file

writer.writerows(A)

python, format string

python, format string "{} %s {}" to have 'foo' and 'bar' in the first and second positions

"""{} %s {}""".format('foo', 'bar')

Replace a string in list of lists

Truncate `\r\n` from each string in a list of string `example`

example = [x.replace('\r\n', '') for x in example]

Python: split elements of a list

split elements of a list `l` by '\t'

[i.partition('\t')[-1] for i in l if '\t' in i]

Splitting a string by using two substrings in Python

search for regex pattern 'Test(.*)print' in string `testStr` including new line character '\n'

re.search('Test(.*)print', testStr, re.DOTALL)

python, locating and clicking a specific button with selenium

find button that is in li class `next` and assign it to variable `next`

next = driver.find_element_by_css_selector('li.next>a')

Getting file size in Python?

get the size of file 'C:\\Python27\\Lib\\genericpath.py'

os.stat('C:\\Python27\\Lib\\genericpath.py').st_size

how do i return a string from a regex match in python

return a string from a regex match with pattern '<img.*?>' in string 'line'

imtag = re.match('<img.*?>', line).group(0)

How to change folder names in python?

Rename a folder `Joe Blow` to `Blow, Joe`

os.rename('Joe Blow', 'Blow, Joe')

How to find overlapping matches with a regexp?

find overlapping matches from a string `hello` using regex

re.findall('(?=(\\w\\w))', 'hello')

express binary literals

convert 173 to binary string

bin(173)

express binary literals

convert binary string '01010101111' to integer

int('01010101111', 2)

express binary literals

convert binary string '010101' to integer

int('010101', 2)

express binary literals

convert binary string '0b0010101010' to integer

int('0b0010101010', 2)

express binary literals

convert 21 to binary string

bin(21)

express binary literals

convert binary string '11111111' to integer

int('11111111', 2)

Delete digits in Python (Regex)

delete all digits in string `s` that are not directly attached to a word character

re.sub('$\\d+\\W+|\\b\\d+\\b|\\W+\\d+$', '', s)

Delete digits in Python (Regex)

delete digits at the end of string `s`

re.sub('\\b\\d+\\b', '', s)

Delete digits in Python (Regex)

Delete self-contained digits from string `s`

s = re.sub('^\\d+\\s|\\s\\d+\\s|\\s\\d+$', ' ', s)

Python Split String

truncate string `s` up to character ':'

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

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

print a string `s` by splitting with comma `,`

print(s.split(','))

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

Create list by splitting string `mystring` using "," as delimiter

mystring.split(',')

How to remove parentheses only around single words in a string

remove parentheses only around single words in a string `s` using regex

re.sub('\\((\\w+)\\)', '\\1', s)

how to open a url in python

webbrowser open url `url`

webbrowser.open_new(url)

how to open a url in python

webbrowser open url 'http://example.com'

webbrowser.open('http://example.com')

PyQt QPushButton Background color

change the background colour of the button `pushbutton` to red

self.pushButton.setStyleSheet('background-color: red')

Zip and apply a list of functions over a list of values in Python

apply a list of functions named 'functions' over a list of values named 'values'

[x(y) for x, y in zip(functions, values)]

How do I modify the width of a TextCtrl in wxPython?

modify the width of a text control as `300` keeping default height in wxpython

wx.TextCtrl(self, -1, size=(300, -1))

Displaying a grayscale Image

display a grayscale image from array of pixels `imageArray`

imshow(imageArray, cmap='Greys_r')