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Removing control characters from a string in python

removing control characters from a string `s`

return ''.join(ch for ch in s if unicodedata.category(ch)[0] != 'C')

How to compare two lists in python

Compare if each value in list `a` is less than respective index value in list `b`

all(i < j for i, j in zip(a, b))

python selenium click on button

python selenium click on button '.button.c_button.s_button'

driver.find_element_by_css_selector('.button.c_button.s_button').click()

python selenium click on button

driver.find_element_by_css_selector('.button .c_button .s_button').click()

Is it possible to kill a process on Windows from within Python?

kill a process `make.exe` from python script on windows

os.system('taskkill /im make.exe')

How to get current date and time from DB using SQLAlchemy

SQLAlchemy select records of columns of table `my_table` in addition to current date column

print(select([my_table, func.current_date()]).execute())

Remove duplicate chars using regex?

remove duplicate characters from string 'ffffffbbbbbbbqqq'

re.sub('([a-z])\\1+', '\\1', 'ffffffbbbbbbbqqq')

Regex to remove periods in acronyms?

remove periods inbetween capital letters that aren't immediately preceeded by word character(s) in a string `s` using regular expressions

re.sub('(?<!\\w)([A-Z])\\.', '\\1', s)

how to parse a list or string into chunks of fixed length

Get a list of strings `split_text` with fixed chunk size `n` from a string `the_list`

split_list = [the_list[i:i + n] for i in range(0, len(the_list), n)]

replacing all regex matches in single line

match string 'this is my string' with regex '\\b(this|string)\\b' then replace it with regex '<markup>\\1</markup>'

re.sub('\\b(this|string)\\b', '<markup>\\1</markup>', 'this is my string')

Output data from all columns in a dataframe in pandas

output data of the first 7 columns of Pandas dataframe

pandas.set_option('display.max_columns', 7)

Output data from all columns in a dataframe in pandas

Display maximum output data of columns in dataframe `pandas` that will fit into the screen

pandas.set_option('display.max_columns', None)

Modifying a subset of rows in a pandas dataframe

set the value in column 'B' to NaN if the corresponding value in column 'A' is equal to 0 in pandas dataframe `df`

df.ix[df.A == 0, 'B'] = np.nan

Selecting Element followed by text with Selenium WebDriver

Selecting Element "//li/label/input" followed by text "polishpottery" with Selenium WebDriver `driver`

driver.find_element_by_xpath("//li/label/input[contains(..,'polishpottery')]")

Ordering a list of dictionaries in python

Sort a list of dictionaries `mylist` by keys "weight" and "factor"

mylist.sort(key=operator.itemgetter('weight', 'factor'))

Ordering a list of dictionaries in python

ordering a list of dictionaries `mylist` by elements 'weight' and 'factor'

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

From a list of lists to a dictionary

Convert a list of lists `lol` to a dictionary with key as second value of a list and value as list itself

{x[1]: x for x in lol}

Sorting dictionary keys based on their values

sort keys of dictionary 'd' based on their values

sorted(d, key=lambda k: d[k][1])

Python: How to round 123 to 100 instead of 100.0?

round 123 to 100

int(round(123, -2))

How do I create a file in python without overwriting an existing file

create file 'x' if file 'x' does not exist

fd = os.open('x', os.O_WRONLY | os.O_CREAT | os.O_EXCL)

How to slice a list of strings with space delimiter?

get a list of last trailing words from another list of strings`Original_List`

new_list = [x.split()[-1] for x in Original_List]

Reverse a string

Reverse a string 'hello world'

'hello world'[::(-1)]

Reverse a string

Reverse list `s`

s[::(-1)]

Reverse a string

Reverse string 'foo'

''.join(reversed('foo'))

Reverse a string

Reverse a string `string`

''.join(reversed(string))

Reverse a string

Reverse a string "foo"

'foo'[::(-1)]

Reverse a string

Reverse a string `a_string`

a_string[::(-1)]

Reverse a string

Reverse a string `a_string`

def reversed_string(a_string): return a_string[::(-1)]

Reverse a string

Reverse a string `s`

''.join(reversed(s))

Generate a sequence of numbers in Python

generate a string of numbers separated by comma which is divisible by `4` with remainder `1` or `2`.

""",""".join(str(i) for i in range(100) if i % 4 in (1, 2))

How to convert this list into a dictionary

convert list `lst` of key, value pairs into a dictionary

dict([(e[0], int(e[1])) for e in lst])

sorting a list of tuples in Python

sorting a list of tuples `list_of_tuples` where each tuple is reversed

sorted(list_of_tuples, key=lambda tup: tup[::-1])

sorting a list of tuples in Python

sorting a list of tuples `list_of_tuples` by second key

sorted(list_of_tuples, key=lambda tup: tup[1])

Concatenating two one-dimensional NumPy arrays

Concatenating two one-dimensional NumPy arrays 'a' and 'b'.

numpy.concatenate([a, b])

Writing a list to a file with Python

writing items in list `thelist` to file `thefile`

for item in thelist: thefile.write(('%s\n' % item))

Writing a list to a file with Python

writing items in list `thelist` to file `thefile`

for item in thelist: pass

Writing a list to a file with Python

serialize `itemlist` to file `outfile`

pickle.dump(itemlist, outfile)

Writing a list to a file with Python

writing items in list `itemlist` to file `outfile`

outfile.write('\n'.join(itemlist))

SQLAlchemy: a better way for update with declarative?

Update a user's name as `Bob Marley` having id `123` in SQLAlchemy

session.query(User).filter_by(id=123).update({'name': 'Bob Marley'})

How to send cookies in a post request with the Python Requests library?

send cookies `cookie` in a post request to url 'http://wikipedia.org' with the python requests library

r = requests.post('http://wikipedia.org', cookies=cookie)

How to include third party Python libraries in Google App Engine?

insert directory 'libs' at the 0th index of current directory

sys.path.insert(0, 'libs')

get current time

get current date and time

datetime.datetime.now()

get current time

get current time

datetime.datetime.now().time()

get current time

get current time in pretty format

strftime('%Y-%m-%d %H:%M:%S', gmtime())

get current time

get current time in string format

str(datetime.now())

get current time

get current time

datetime.datetime.time(datetime.datetime.now())

Converting hex to int in python

convert hex '\xff' to integer

ord('\xff')

Python Pandas Identify Duplicated rows with Additional Column

identify duplicated rows in columns 'PplNum' and 'RoomNum' with additional column in dataframe `df`

df.groupby(['PplNum', 'RoomNum']).cumcount() + 1

How to get UTC time in Python?

get current utc time

datetime.utcnow()

Python: Make last item of array become the first

move last item of array `a` to the first position

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

pandas: how to run a pivot with a multi-index?

Convert dataframe `df` to a pivot table using column 'year', 'month', and 'item' as indexes

df.set_index(['year', 'month', 'item']).unstack(level=-1)

pandas: how to run a pivot with a multi-index?

run a pivot with a multi-index `year` and `month` in a pandas data frame

df.pivot_table(values='value', index=['year', 'month'], columns='item')

How to print/show an expression in rational number form in python

print a rational number `3/2`

print('\n\x1b[4m' + '3' + '\x1b[0m' + '\n2')

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

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

How to loop backwards in python?

iterate backwards from 10 to 0

range(10, 0, -1)

Get Element value with minidom with Python

get value of first child of xml node `name`

name[0].firstChild.nodeValue

Simple threading in Python 2.6 using thread.start_new_thread()

start a new thread for `myfunction` with parameters 'MyStringHere' and 1

thread.start_new_thread(myfunction, ('MyStringHere', 1))

Simple threading in Python 2.6 using thread.start_new_thread()

start a new thread for `myfunction` with parameters 'MyStringHere' and 1

thread.start_new_thread(myfunction, ('MyStringHere', 1))

How to find all positions of the maximum value in a list?

get index of the first biggest element in list `a`

a.index(max(a))

Regex add character to matched string

replace periods `.` that are not followed by periods or spaces with a period and a space `. `

re.sub('\\.(?=[^ .])', '. ', para)

how to turn a string of letters embedded in squared brackets into embedded lists

convert a string `a` of letters embedded in squared brackets into embedded lists

[i.split() for i in re.findall('\\[([^\\[\\]]+)\\]', a)]

extract item from list of dictionaries

extract dictionary `d` from list `a` where the value associated with the key 'name' of dictionary `d` is equal to 'pluto'

[d for d in a if d['name'] == 'pluto']

extract item from list of dictionaries

extract dictionary from list of dictionaries based on a key's value.

[d for d in a if d['name'] == 'pluto']

Python: simplest way to get list of values from dict?

Retrieve list of values from dictionary 'd'

list(d.values())

String manipulation in Cython

replace occurrences of two whitespaces or more with one whitespace ' ' in string `s`

re.sub(' +', ' ', s)

Set execute bit for a file using python

Change the mode of file 'my_script.sh' to permission number 484

os.chmod('my_script.sh', 484)

Pandas to_csv call is prepending a comma

write pandas dataframe `df` to the file 'c:\\data\\t.csv' without row names

df.to_csv('c:\\data\\t.csv', index=False)

Python regex to remove all words which contains number

remove all words which contains number from a string `words` using regex

re.sub('\\w*\\d\\w*', '', words).strip()

How can I control the keyboard and mouse with Python?

control the keyboard and mouse with dogtail in linux

dogtail.rawinput.click(100, 100)

How to parse dates with -0400 timezone string in python?

parse date string '2009/05/13 19:19:30 -0400' using format '%Y/%m/%d %H:%M:%S %z'

datetime.strptime('2009/05/13 19:19:30 -0400', '%Y/%m/%d %H:%M:%S %z')

Python - Locating the position of a regex match in a string?

Get the position of a regex match for word `is` in a string `String`

re.search('\\bis\\b', String).start()

Python - Locating the position of a regex match in a string?

Get the position of a regex match `is` in a string `String`

re.search('is', String).start()

How to input an integer tuple from user?

input an integer tuple from user

tuple(map(int, input().split(',')))

How to input an integer tuple from user?

input a tuple of integers from user

tuple(int(x.strip()) for x in input().split(','))

How to replace unicode characters in string with something else python?

replace unicode character '\u2022' in string 'str' with '*'

str.decode('utf-8').replace('\u2022', '*').encode('utf-8')

How to replace unicode characters in string with something else python?

replace unicode characters ''\u2022' in string 'str' with '*'

str.decode('utf-8').replace('\u2022', '*')

How to convert ndarray to array?

convert ndarray with shape 3x3 to array

np.zeros((3, 3)).ravel()

What OS am I running on

get os name

import platform platform.system()

What OS am I running on

get os version

import platform platform.release()

What OS am I running on

get the name of the OS

print(os.name)

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

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

Python string formatting when string contains "%s" without escaping

replace fields delimited by braces {} in string "Day old bread, 50% sale {0}" with string 'today'

"""Day old bread, 50% sale {0}""".format('today')

List of Tuples (string, float)with NaN How to get the min value?

Get a minimum value from a list of tuples `list` with values of type `string` and `float` with nan

min(list, key=lambda x: float('inf') if math.isnan(x[1]) else x[1])

Python: Finding average of a nested list

Find average of a nested list `a`

a = [(sum(x) / len(x)) for x in zip(*a)]

How do I add custom field to Python log format string?

Log info message 'Log message' with attributes `{'app_name': 'myapp'}`

logging.info('Log message', extra={'app_name': 'myapp'})

finding non-numeric rows in dataframe in pandas?

replace values of dataframe `df` with True if numeric

df.applymap(lambda x: isinstance(x, (int, float)))

Sort list of mixed strings based on digits

sort list `l` based on its elements' digits

sorted(l, key=lambda x: int(re.search('\\d+', x).group(0)))

Function to close the window in Tkinter

close the window in tkinter

self.root.destroy()

Calcuate mean for selected rows for selected columns in pandas data frame

get mean of columns `2, 5, 6, 7, 8` for all rows in dataframe `df`

df.iloc[:, ([2, 5, 6, 7, 8])].mean(axis=1)

How to filter by sub-level index in Pandas

filter dataframe `df` by sub-level index '0630' in pandas

df[df.index.map(lambda x: x[1].endswith('0630'))]

Deleting row with Flask-SQLAlchemy

flask-sqlalchemy delete row `page`

db.session.delete(page)

How do I convert a unicode to a string at the Python level?

Format a string `u'Andr\xc3\xa9'` that has unicode characters

"""""".join(chr(ord(c)) for c in 'Andr\xc3\xa9')

How do I convert a unicode to a string at the Python level?

convert a unicode 'Andr\xc3\xa9' to a string

"""""".join(chr(ord(c)) for c in 'Andr\xc3\xa9').decode('utf8')

Directory listing

list all files in directory "."

for (dirname, dirnames, filenames) in os.walk('.'): for subdirname in dirnames: print(os.path.join(dirname, subdirname)) for filename in filenames: pass

Directory listing

list all files in directory `path`

os.listdir(path)

How to rename all folders?

rename file `dir` to `dir` + '!'

os.rename(dir, dir + '!')

Pythonic way to insert every 2 elements in a string

Insert a character `-` after every two elements in a string `s`

"""-""".join(a + b for a, b in zip(s[::2], s[1::2]))

Printing numbers in python

printing numbers rounding up to third decimal place

print('%.3f' % 3.1415)

Add element to a json in python

add variable `var` to key 'f' of first element in JSON data `data`

data[0]['f'] = var

Retrieving python module path

get the path of module `a_module`

print(a_module.__file__)