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Python - find digits in a string

get digits in string `my_string`

"""""".join(c for c in my_string if c.isdigit())

python split string based on regular expression

split string `str1` on one or more spaces with a regular expression

re.split(' +', str1)

python split string based on regular expression

re.findall('\\S+', str1)

Python: How to get attribute of attribute of an object with getattr?

Evaluate a nested dictionary `myobject.id.number` to get `number` if `myobject` is present with getattr

getattr(getattr(myobject, 'id', None), 'number', None)

Convert generator object to a dictionary

convert generator object to a dictionary

{i: (i * 2) for i in range(10)}

Convert generator object to a dictionary

convert generator object to a dictionary

dict((i, i * 2) for i in range(10))

How do I tell matplotlib that I am done with a plot?

Matplotlib clear the current axes.

plt.cla()

Python Convert String Literal to Float

split string `s` into float values and write sum to `total`

total = sum(float(item) for item in s.split(','))

Python ASCII to binary

Convert ascii value 'P' to binary

bin(ord('P'))

Get a string after a specific substring

print a string after a specific substring ', ' in string `my_string `

print(my_string.split(', ', 1)[1])

Python Accessing Nested JSON Data

get value of key `post code` associated with first index of key `places` of dictionary `data`

print(data['places'][0]['post code'])

Python RegEx using re.sub with multiple patterns

remove colon character surrounded by vowels letters in string `word`

word = re.sub('([aeiou]):(([aeiou][^aeiou]*){3})$', '\\1\\2', word)

How to extract data from JSON Object in Python?

extract data field 'bar' from json object

json.loads('{"foo": 42, "bar": "baz"}')['bar']

Convert JSON array to Python list

Convert JSON array `array` to Python object

data = json.loads(array)

Convert JSON array to Python list

Convert JSON array `array` to Python object

data = json.loads(array)

Parsing a tweet to extract hashtags into an array in Python

pars a string 'http://example.org/#comments' to extract hashtags into an array

re.findall('#(\\w+)', 'http://example.org/#comments')

Python - Fastest way to check if a string contains specific characters in any of the items in a list

do a boolean check if a string `lestring` contains any of the items in list `lelist`

any(e in lestring for e in lelist)

How to plot two columns of a pandas data frame using points?

df.plot(x='col_name_1', y='col_name_2', style='o')

Parsing HTML

Parsing HTML string `html` using BeautifulSoup

parsed_html = BeautifulSoup(html) print(parsed_html.body.find('div', attrs={'class': 'container', }).text)

Parsing HTML

Parsing webpage 'http://www.google.com/' using BeautifulSoup

page = urllib.request.urlopen('http://www.google.com/') soup = BeautifulSoup(page)

change figure size and figure format in matplotlib

change figure size to 3 by 4 in matplotlib

plt.figure(figsize=(3, 4))

Best way to strip punctuation from a string in Python

Strip punctuation from string `s`

s.translate(None, string.punctuation)

Django urlsafe base64 decoding with decryption

django urlsafe base64 decode string `uenc` with decryption

base64.urlsafe_b64decode(uenc.encode('ascii'))

Get the number of all keys in a dictionary of dictionaries in Python

get the number of all keys in the nested dictionary `dict_list`

len(dict_test) + sum(len(v) for v in dict_test.values())

Python convert decimal to hex

return the conversion of decimal `d` to hex without the '0x' prefix

hex(d).split('x')[1]

converting integer to list in python

create a list containing digits of number 123 as its elements

list(str(123))

converting integer to list in python

converting integer `num` to list

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

Python Mechanize select a form with no name

select a first form with no name in mechanize

br.select_form(nr=0)

Python load json file with UTF-8 BOM header

Open file 'sample.json' in read mode with encoding of 'utf-8-sig'

json.load(codecs.open('sample.json', 'r', 'utf-8-sig'))

Python load json file with UTF-8 BOM header

load json file 'sample.json' with utf-8 bom header

json.loads(open('sample.json').read().decode('utf-8-sig'))

Issue sending email with python?

setup a smtp mail server to `smtp.gmail.com` with port `587`

server = smtplib.SMTP('smtp.gmail.com', 587)

Reversing bits of Python integer

revers correlating bits of integer `n`

int('{:08b}'.format(n)[::-1], 2)

Pandas DataFrame Add column to index without resetting

add column `d` to index of dataframe `df`

df.set_index(['d'], append=True)

Iterating over dictionaries using for loops

Iterating over a dictionary `d` using for loops

for (key, value) in d.items(): pass

Iterating over dictionaries using for loops

Iterating over a dictionary `d` using for loops

for (key, value) in list(d.items()): pass

Iterating over dictionaries using for loops

Iterating key and items over dictionary `d`

for (letter, number) in list(d.items()): pass

Iterating over dictionaries using for loops

Iterating key and items over dictionary `d`

for (k, v) in list(d.items()): pass

Iterating over dictionaries using for loops

get keys and items of dictionary `d`

list(d.items())

Iterating over dictionaries using for loops

get keys and items of dictionary `d` as a list

list(d.items())

Iterating over dictionaries using for loops

Iterating key and items over dictionary `d`

for (k, v) in list(d.items()): pass

Iterating over dictionaries using for loops

Iterating key and items over dictionary `d`

for (letter, number) in list(d.items()): pass

Iterating over dictionaries using for loops

Iterating key and items over dictionary `d`

for (letter, number) in list(d.items()): pass

How do I implement a null coalescing operator in SQLAlchemy?

query all data from table `Task` where the value of column `time_spent` is bigger than 3 hours

session.query(Task).filter(Task.time_spent > timedelta(hours=3)).all()

How do I compile a Visual Studio project from the command-line?

compile Visual Studio project `project.sln` from the command line through python

os.system('msbuild project.sln /p:Configuration=Debug')

Get max key in dictionary

get max key in dictionary `MyCount`

max(list(MyCount.keys()), key=int)

Can I use an alias to execute a program from a python script

execute command 'source .bashrc; shopt -s expand_aliases; nuke -x scriptPath' from python script

os.system('source .bashrc; shopt -s expand_aliases; nuke -x scriptPath')

How to get a function name as a string in Python?

get a name of function `my_function` as a string

my_function.__name__

How to get a function name as a string in Python?

my_function.__name__

How to check if all values in the columns of a numpy matrix are the same?

check if all values in the columns of a numpy matrix `a` are same

np.all(a == a[(0), :], axis=0)

Sorting a list of tuples by the addition of second and third element of the tuple

sort list `a` in ascending order based on the addition of the second and third elements of each tuple in it

sorted(a, key=lambda x: (sum(x[1:3]), x[0]))

Sorting a list of tuples by the addition of second and third element of the tuple

sort a list of tuples `a` by the sum of second and third element of each tuple

sorted(a, key=lambda x: (sum(x[1:3]), x[0]), reverse=True)

Sorting a list of tuples by the addition of second and third element of the tuple

sorting a list of tuples `lst` by the sum of the second elements onwards, and third element of the tuple

sorted(lst, key=lambda x: (sum(x[1:]), x[0]))

Sorting a list of tuples by the addition of second and third element of the tuple

sort the list of tuples `lst` by the sum of every value except the first and by the first value in reverse order

sorted(lst, key=lambda x: (sum(x[1:]), x[0]), reverse=True)

Add headers in a Flask app with unicode_literals

add header 'WWWAuthenticate' in a flask app with value 'Basic realm="test"'

response.headers['WWW-Authenticate'] = 'Basic realm="test"'

In Django, how do I clear a sessionkey?

clear session key 'mykey'

del request.session['mykey']

Python date string to date object

convert date string '24052010' to date object in format '%d%m%Y'

datetime.datetime.strptime('24052010', '%d%m%Y').date()

Replace non-ASCII characters with a single space

Replace non-ASCII characters in string `text` with a single space

re.sub('[^\\x00-\\x7F]+', ' ', text)

List of lists into numpy array

numpy.array([[1, 2], [3, 4]])

What does a for loop within a list do in Python?

Get a list `myList` from 1 to 10

myList = [i for i in range(10)]

using regular expression to split string in python

use regex pattern '((.+?)\\2+)' to split string '44442(2)2(2)44'

[m[0] for m in re.compile('((.+?)\\2+)').findall('44442(2)2(2)44')]

using regular expression to split string in python

use regular expression '((\\d)(?:[()]*\\2*[()]*)*)' to split string `s`

[i[0] for i in re.findall('((\\d)(?:[()]*\\2*[()]*)*)', s)]

How to remove the space between subplots in matplotlib.pyplot?

remove the space between subplots in matplotlib.pyplot

fig.subplots_adjust(wspace=0, hspace=0)

How to reverse tuples in Python?

Reverse list `x`

x[::-1]

Python JSON encoding

json.dumps({'apple': 'cat', 'banana': 'dog', 'pear': 'fish'})

Writing List of Strings to Excel CSV File in Python

write a list of strings `row` to csv object `csvwriter`

csvwriter.writerow(row)

How to convert datetime to string in python in django

Jinja2 formate date `item.date` accorto pattern 'Y M d'

{{(item.date | date): 'Y M d'}}

Non-consuming regular expression split in Python

Split a string `text` with comma, question mark or exclamation by non-consuming regex using look-behind

re.split('(?<=[\\.\\?!]) ', text)

UTF in Python Regex

create a regular expression object with the pattern '\xe2\x80\x93'

re.compile('\xe2\x80\x93')

declare an array

declare an array `variable`

variable = []

declare an array

declare an array with element 'i'

intarray = array('i')

How to reverse the elements in a sublist?

given list `to_reverse`, reverse the all sublists and the list itself

[sublist[::-1] for sublist in to_reverse[::-1]]

Replace all non-alphanumeric characters in a string

re.sub('[^0-9a-zA-Z]+', '*', 'h^&ell`.,|o w]{+orld')

Python: unescape special characters without splitting data

unescape special characters without splitting data in array of strings `['I ', u'<', '3s U ', u'&', ' you luvz me']`

"""""".join(['I ', '<', '3s U ', '&', ' you luvz me'])

How can I disable logging while running unit tests in Python Django?

disable logging while running unit tests in python django

logging.disable(logging.CRITICAL)

Adding url to mysql row in python

adding url `url` to mysql row

cursor.execute('INSERT INTO index(url) VALUES(%s)', (url,))

Convert column of date objects in Pandas DataFrame to strings

convert column of date objects 'DateObj' in pandas dataframe `df` to strings in new column 'DateStr'

df['DateStr'] = df['DateObj'].dt.strftime('%d%m%Y')

python regex get first part of an email address

split string `s` by '@' and get the first element

s.split('@')[0]

Python Pandas: drop rows of a timeserie based on time range

drop rows of dataframe `df` whose index is smaller than the value of `start_remove` or bigger than the value of`end_remove`

df.query('index < @start_remove or index > @end_remove')

Python Pandas: drop rows of a timeserie based on time range

Drop the rows in pandas timeseries `df` from the row containing index `start_remove` to the row containing index `end_remove`

df.loc[(df.index < start_remove) | (df.index > end_remove)]

How to count the Nan values in the column in Panda Data frame

Get the number of NaN values in each column of dataframe `df`

df.isnull().sum()

Turn Pandas Multi-Index into column

reset index of dataframe `df`so that existing index values are transferred into `df`as columns

df.reset_index(inplace=True)

python getting a list of value from list of dict

generate a list containing values associated with the key 'value' of each dictionary inside list `list_of_dicts`

[x['value'] for x in list_of_dicts]

python getting a list of value from list of dict

[d['value'] for d in l]

python getting a list of value from list of dict

[d['value'] for d in l if 'value' in d]

Converting NumPy array into Python List structure?

convert numpy array into python list structure

np.array([[1, 2, 3], [4, 5, 6]]).tolist()

Converting string to tuple and adding to tuple

converting string '(1,2,3,4)' to a tuple

ast.literal_eval('(1,2,3,4)')

How to keep a list of lists sorted as it is created

keep a list `dataList` of lists sorted as it is created by second element

dataList.sort(key=lambda x: x[1])

Python: Uniqueness for list of lists

remove duplicated items from list of lists `testdata`

list(map(list, set(map(lambda i: tuple(i), testdata))))

Python: Uniqueness for list of lists

uniqueness for list of lists `testdata`

[list(i) for i in set(tuple(i) for i in testdata)]

In Django, how do I check if a user is in a certain group?

in django, check if a user is in a group 'Member'

return user.groups.filter(name='Member').exists()

In Django, how do I check if a user is in a certain group?

check if a user `user` is in a group from list of groups `['group1', 'group2']`

return user.groups.filter(name__in=['group1', 'group2']).exists()

Dynamically changing log level in python without restarting the application

Change log level dynamically to 'DEBUG' without restarting the application

logging.getLogger().setLevel(logging.DEBUG)

How to transform a tuple to a string of values without comma and parentheses

Concat each values in a tuple `(34.2424, -64.2344, 76.3534, 45.2344)` to get a string

"""""".join(str(i) for i in (34.2424, -64.2344, 76.3534, 45.2344))

What is the simplest way to swap char in a string with Python?

swap each pair of characters in string `s`

"""""".join([s[x:x + 2][::-1] for x in range(0, len(s), 2)])

Drawing a huge graph with networkX and matplotlib

save current figure to file 'graph.png' with resolution of 1000 dpi

plt.savefig('graph.png', dpi=1000)

delete items from list of list: pythonic way

delete items from list `my_list` if the item exist in list `to_dell`

my_list = [[x for x in sublist if x not in to_del] for sublist in my_list]

Find an element in a list of tuples

find all the elements that consists value '1' in a list of tuples 'a'

[item for item in a if 1 in item]

Find an element in a list of tuples

find all elements in a list of tuples `a` where the first element of each tuple equals 1

[item for item in a if item[0] == 1]

How can I get the index value of a list comprehension?

Get the index value in list `p_list` using enumerate in list comprehension

{p.id: {'id': p.id, 'position': ind} for ind, p in enumerate(p_list)}

how to uniqify a list of dict in python

[dict(y) for y in set(tuple(x.items()) for x in d)]