Datasets:

neulab

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conala

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check if a list is empty

check if list `a` is empty

if (not a): pass

check if a list is empty

check if list `seq` is empty

if (not seq): pass

check if a list is empty

check if list `li` is empty

if (len(li) == 0): pass

Find the indices of elements greater than x

create a list containing the indices of elements greater than 4 in list `a`

[i for i, v in enumerate(a) if v > 4]

sorting list of nested dictionaries in python

reverse list `yourdata`

sorted(yourdata, reverse=True)

sorting list of nested dictionaries in python

sort list of nested dictionaries `yourdata` in reverse based on values associated with each dictionary's key 'subkey'

sorted(yourdata, key=lambda d: d.get('key', {}).get('subkey'), reverse=True)

sorting list of nested dictionaries in python

sort list of nested dictionaries `yourdata` in reverse order of 'key' and 'subkey'

yourdata.sort(key=lambda e: e['key']['subkey'], reverse=True)

How to remove decimal points in pandas

remove decimal points in pandas data frame using round

df.round()

How to extract data from matplotlib plot

Get data from matplotlib plot

gca().get_lines()[n].get_xydata()

How to get the N maximum values per row in a numpy ndarray?

get the maximum 2 values per row in array `A`

A[:, -2:]

MultiValueDictKeyError in Django

Get value for "username" parameter in GET request in Django

request.GET.get('username', '')

Any way to properly pretty-print ordered dictionaries in Python?

pretty-print ordered dictionary `o`

pprint(dict(list(o.items())))

Django can't find URL pattern

Confirm urls in Django properly

url('^$', include('sms.urls')),

Django can't find URL pattern

Configure url in django properly

url('^', include('sms.urls')),

Pythonic way to get the largest item in a list

get the tuple in list `a_list` that has the largest item in the second index

max_item = max(a_list, key=operator.itemgetter(1))

Pythonic way to get the largest item in a list

find tuple in list of tuples `a_list` with the largest second element

max(a_list, key=operator.itemgetter(1))

How to iterate over time periods in pandas

resample series `s` into 3 months bins and sum each bin

s.resample('3M', how='sum')

how to extract elements from a list in python?

extract elements at indices (1, 2, 5) from a list `a`

[a[i] for i in (1, 2, 5)]

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

filter lines from a text file 'textfile' which contain a word 'apple'

[line for line in open('textfile') if 'apple' in line]

How to convert a Date string to a DateTime object?

convert a date string `s` to a datetime object

datetime.datetime.strptime(s, '%Y-%m-%dT%H:%M:%SZ')

Reading tab-delimited file with Pandas - works on Windows, but not on Mac

reading tab-delimited csv file `filename` with pandas on mac

pandas.read_csv(filename, sep='\t', lineterminator='\r')

Replace first occurence of string

replace only first occurence of string `TEST` from a string `longlongTESTstringTEST`

'longlongTESTstringTEST'.replace('TEST', '?', 1)

How can I zip file with a flattened directory structure using Zipfile in Python?

zip file `pdffile` using its basename as directory name

archive.write(pdffile, os.path.basename(pdffile))

Elegant way to create a dictionary of pairs, from a list of tuples?

create a dictionary of pairs from a list of tuples `myListOfTuples`

dict(x[1:] for x in reversed(myListOfTuples))

How to subtract two lists in python

subtract elements of list `List1` from elements of list `List2`

[(x1 - x2) for x1, x2 in zip(List1, List2)]

How to tell if string starts with a number?

check if string `string` starts with a number

string[0].isdigit()

How to tell if string starts with a number?

Check if string `strg` starts with any of the elements in list ('0', '1', '2', '3', '4', '5', '6', '7', '8', '9')

strg.startswith(('0', '1', '2', '3', '4', '5', '6', '7', '8', '9'))

How can I find script's directory with Python?

print script's directory

print(os.path.dirname(os.path.realpath(__file__)))

Finding the surrounding sentence of a char/word in a string

split string `text` by the occurrences of regex pattern '(?<=\\?|!|\\.)\\s{0,2}(?=[A-Z]|$)'

re.split('(?<=\\?|!|\\.)\\s{0,2}(?=[A-Z]|$)', text)

Plotting a list of (x, y) coordinates in python matplotlib

Make a scatter plot using unpacked values of list `li`

plt.scatter(*zip(*li))

Rearrange tuple of tuples in Python

rearrange tuple of tuples `t`

tuple(zip(*t))

Find Average of Every Three Columns in Pandas dataframe

Get average for every three columns in `df` dataframe

df.groupby(np.arange(len(df.columns)) // 3, axis=1).mean()

How do I convert a list of ascii values to a string in python?

convert a list `L` of ascii values to a string

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

Python 2.7 Counting number of dictionary items with given value

count the number of pairs in dictionary `d` whose value equal to `chosen_value`

sum(x == chosen_value for x in list(d.values()))

Python 2.7 Counting number of dictionary items with given value

count the number of values in `d` dictionary that are predicate to function `some_condition`

sum(1 for x in list(d.values()) if some_condition(x))

convert double to float in Python

convert double 0.00582811585976 to float

struct.unpack('f', struct.pack('f', 0.00582811585976))

Converting datetime.date to UTC timestamp in Python

convert datetime.date `dt` to utc timestamp

timestamp = (dt - datetime(1970, 1, 1)).total_seconds()

Custom sorting in pandas dataframe

sort column `m` in panda dataframe `df`

df.sort('m')

How to sort with lambda in Python

Sort a data `a` in descending order based on the `modified` attribute of elements using lambda function

a = sorted(a, key=lambda x: x.modified, reverse=True)

How can I print the Truth value of a variable?

print the truth value of `a`

print(bool(a))

How can I change a specific row label in a Pandas dataframe?

rename `last` row index label in dataframe `df` to `a`

df = df.rename(index={last: 'a'})

Scikit-learn: How to run KMeans on a one-dimensional array?

Fit Kmeans function to a one-dimensional array `x` by reshaping it to be a multidimensional array of single values

km.fit(x.reshape(-1, 1))

sorting a list in python

Sort a list of strings 'words' such that items starting with 's' come first.

sorted(words, key=lambda x: 'a' + x if x.startswith('s') else 'b' + x)

login to a site using python and opening the login site in the browser

open the login site 'http://somesite.com/adminpanel/index.php' in the browser

webbrowser.open('http://somesite.com/adminpanel/index.php')

Pythonic way to fetch all elements in a dictionary, falling between two keys?

fetch all elements in a dictionary `parent_dict`, falling between two keys 2 and 4

dict((k, v) for k, v in parent_dict.items() if 2 < k < 4)

Pythonic way to fetch all elements in a dictionary, falling between two keys?

fetch all elements in a dictionary 'parent_dict' where the key is between the range of 2 to 4

dict((k, v) for k, v in parent_dict.items() if k > 2 and k < 4)

python sorting two lists

sort two lists `list1` and `list2` together using lambda function

[list(x) for x in zip(*sorted(zip(list1, list2), key=lambda pair: pair[0]))]

number of values in a list greater than a certain number

get the number of values in list `j` that is greater than 5

sum(((i > 5) for i in j))

number of values in a list greater than a certain number

get the number of values in list `j` that is greater than 5

len([1 for i in j if (i > 5)])

number of values in a list greater than a certain number

get the number of values in list `j` that is greater than `i`

j = np.array(j) sum((j > i))

Python: elegant way of creating a list of tuples?

zip list `a`, `b`, `c` into a list of tuples

[(x + tuple(y)) for x, y in zip(zip(a, b), c)]

Changing file permission in python

changing permission of file `path` to `stat.S_IRUSR | stat.S_IRGRP | stat.S_IROTH`

os.chmod(path, stat.S_IRUSR | stat.S_IRGRP | stat.S_IROTH)

Multiple files for one argument in argparse Python 2.7

argparse associate zero or more arguments with flag 'file'

parser.add_argument('file', nargs='*')

Comparing values in two lists in Python

get a list of booleans `z` that shows wether the corresponding items in list `x` and `y` are equal

z = [(i == j) for i, j in zip(x, y)]

Comparing values in two lists in Python

create a list which indicates whether each element in `x` and `y` is identical

[(x[i] == y[i]) for i in range(len(x))]

Python: Extract numbers from a string

[int(s) for s in re.findall('\\b\\d+\\b', "he33llo 42 I'm a 32 string 30")]

Create an empty data frame with index from another data frame

create an empty data frame `df2` with index from another data frame `df1`

df2 = pd.DataFrame(index=df1.index)

How do I convert a string 2 bytes long to an integer in python

unpack first and second bytes of byte string `pS` into integer

struct.unpack('h', pS[0:2])

Printing lists onto tables in python

print list `t` into a table-like shape

print('\n'.join(' '.join(map(str, row)) for row in t))

Sort Pandas Dataframe by Date

df.sort_values(by='Date')

How can I check if a checkbox is checked in Selenium Python Webdriver?

check if a checkbox is checked in selenium python webdriver

driver.find_element_by_name('<check_box_name>').is_selected()

How can I check if a checkbox is checked in Selenium Python Webdriver?

determine if checkbox with id '<check_box_id>' is checked in selenium python webdriver

driver.find_element_by_id('<check_box_id>').is_selected()

Is it possible to use 'else' in a python list comprehension?

replace `0` with `2` in the list `[0, 1, 0, 3]`

[(a if a else 2) for a in [0, 1, 0, 3]]

Parsing string containing Unicode character names

Produce a string that is suitable as Unicode literal from string 'M\\N{AMPERSAND}M\\N{APOSTROPHE}s'

'M\\N{AMPERSAND}M\\N{APOSTROPHE}s'.encode().decode('unicode-escape')

Parsing string containing Unicode character names

Parse a unicode string `M\\N{AMPERSAND}M\\N{APOSTROPHE}s`

'M\\N{AMPERSAND}M\\N{APOSTROPHE}s'.decode('unicode-escape')

Convert unicode codepoint to UTF8 hex in python

convert Unicode codepoint to utf8 hex

chr(int('fd9b', 16)).encode('utf-8')

How can I get Python to use upper case letters to print hex values?

use upper case letters to print hex value `value`

print('0x%X' % value)

How to remove empty string in a list?

get a list `cleaned` that contains all non-empty elements in list `your_list`

cleaned = [x for x in your_list if x]

Python: Want to use a string as a slice specifier

create a slice object using string `string_slice`

slice(*[(int(i.strip()) if i else None) for i in string_slice.split(':')])

Beautiful Soup Using Regex to Find Tags?

Find all the tags `a` and `div` from Beautiful Soup object `soup`

soup.find_all(['a', 'div'])

Get function name as a string in python

get the name of function `func` as a string

print(func.__name__)

How to convert dictionary into string

convert dictionary `adict` into string

"""""".join('{}{}'.format(key, val) for key, val in sorted(adict.items()))

How to convert dictionary into string

convert dictionary `adict` into string

"""""".join('{}{}'.format(key, val) for key, val in list(adict.items()))

copy a list

copy list `old_list` as `new_list`

new_list = old_list[:]

copy a list

copy list `old_list` as `new_list`

new_list = list(old_list)

copy a list

copy list `old_list` as `new_list`

new_list = copy.copy(old_list)

copy a list

deep copy list `old_list` as `new_list`

new_list = copy.deepcopy(old_list)

copy a list

make a copy of list `old_list`

[i for i in old_list]

Remove or adapt border of frame of legend using matplotlib

remove frame of legend in plot `plt`

plt.legend(frameon=False)

How to work with surrogate pairs in Python?

Print a emoji from a string `\\ud83d\\ude4f` having surrogate pairs

"""\\ud83d\\ude4f""".encode('utf-16', 'surrogatepass').decode('utf-16')

Calling a function of a module from a string with the function's name in Python

calling a function named 'myfunction' in the module

globals()['myfunction']()

Checking if a website is up

Check the status code of url "http://www.stackoverflow.com"

urllib.request.urlopen('http://www.stackoverflow.com').getcode()

Checking if a website is up

Check the status code of url "www.python.org"

conn = httplib.HTTPConnection('www.python.org') conn.request('HEAD', '/') r1 = conn.getresponse() print(r1.status, r1.reason)

Checking if a website is up

Check the status code of url `url`

r = requests.head(url) return (r.status_code == 200)

Checking if a website is up

Checking if website "http://www.stackoverflow.com" is up

print(urllib.request.urlopen('http://www.stackoverflow.com').getcode())

Selenium open pop up window [Python]

Selenium `driver` click a hyperlink with the pattern "a[href^='javascript']"

driver.find_element_by_css_selector("a[href^='javascript']").click()

How to store data frame using PANDAS, Python

store data frame `df` to file `file_name` using pandas, python

df.to_pickle(file_name)

Pandas: Mean of columns with the same names

calculate the mean of columns with same name in dataframe `df`

df.groupby(by=df.columns, axis=1).mean()

How to perform double sort inside an array?

sort list `bar` by each element's attribute `attrb1` and attribute `attrb2` in reverse order

bar.sort(key=lambda x: (x.attrb1, x.attrb2), reverse=True)

How to get alpha value of a PNG image with PIL?

get alpha value `alpha` of a png image `img`

alpha = img.split()[-1]

How to get the length of words in a sentence?

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

Find a specific tag with BeautifulSoup

BeautifulSoup find tag 'div' with styling 'width=300px;' in HTML string `soup`

soup.findAll('div', style='width=300px;')

Using a Python dict for a SQL INSERT statement

Execute SQL statement `sql` with values of dictionary `myDict` as parameters

cursor.execute(sql, list(myDict.values()))

Preserving Column Order - Python Pandas and Column Concat

Convert CSV file `Result.csv` to Pandas dataframe using separator ' '

df.to_csv('Result.csv', index=False, sep=' ')

Python: Extract variables out of namespace

update the `globals()` dictionary with the contents of the `vars(args)` dictionary

globals().update(vars(args))

Regular expression to return all characters between two special characters

find all substrings in `mystring` beginning and ending with square brackets

re.findall('\\[(.*?)\\]', mystring)

Python, print all floats to 2 decimal places in output

Format all floating variables `var1`, `var2`, `var3`, `var1` to print to two decimal places.

print('%.2f kg = %.2f lb = %.2f gal = %.2f l' % (var1, var2, var3, var4))

The best way to filter a dictionary in Python

Remove all items from a dictionary `d` where the values are less than `1`

d = dict((k, v) for k, v in d.items() if v > 0)

The best way to filter a dictionary in Python

Filter dictionary `d` to have items with value greater than 0

d = {k: v for k, v in list(d.items()) if v > 0}

In Pandas how do I convert a string of date strings to datetime objects and put them in a DataFrame?

convert a string of date strings `date_stngs ` to datetime objects and put them in a dataframe

pd.to_datetime(pd.Series(date_stngs))