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restart a computer after `900` seconds using subprocess | subprocess.call(['shutdown', '/r', '/t', '900']) |
shutdown a computer using subprocess | subprocess.call(['shutdown', '/s']) |
abort a computer shutdown using subprocess | subprocess.call(['shutdown', '/a ']) |
logoff computer having windows operating system using python | subprocess.call(['shutdown', '/l ']) |
shutdown and restart a computer running windows from script | subprocess.call(['shutdown', '/r']) |
erase the contents of a file `filename` | open('filename', 'w').close() |
convert dataframe `df` to list of dictionaries including the index values | df.to_dict('index') |
Create list of dictionaries from pandas dataframe `df` | df.to_dict('records') |
Group a pandas data frame by monthly frequenct `M` using groupby | df.groupby(pd.TimeGrouper(freq='M')) |
divide the members of a list `conversions` by the corresponding members of another list `trials` | [(c / t) for c, t in zip(conversions, trials)] |
sort dict `data` by value | sorted(data, key=data.get) |
Sort a dictionary `data` by its values | sorted(data.values()) |
Get a list of pairs of key-value sorted by values in dictionary `data` | sorted(list(data.items()), key=lambda x: x[1]) |
display current time | now = datetime.datetime.now().strftime('%H:%M:%S') |
find the index of the second occurrence of the substring `bar` in string `foo bar bar bar` | """foo bar bar bar""".replace('bar', 'XXX', 1).find('bar') |
check if key 'stackoverflow' and key 'google' are presented in dictionary `sites` | set(['stackoverflow', 'google']).issubset(sites) |
replace string ' and ' in string `stuff` with character '/' | stuff.replace(' and ', '/') |
Save array at index 0, index 1 and index 8 of array `np` to tmp file `tmp` | np.savez(tmp, *[getarray[0], getarray[1], getarray[8]]) |
current time | t = datetime.datetime.now() |
subtract 1 hour and 10 minutes from time object `t` | (t - datetime.timedelta(hours=1, minutes=10)) |
add 1 hour and 2 minutes to time object `t` | dt = datetime.datetime.combine(datetime.date.today(), t) |
subtract 5 hours from the time object `dt` | dt -= datetime.timedelta(hours=5) |
encode string `data` using hex 'hex' encoding | print(data.encode('hex')) |
Return the decimal value for each hex character in data `data` | print(' '.join([str(ord(a)) for a in data])) |
Get all the items from a list of tuple 'l' where second item in tuple is '1'. | [x for x in l if x[1] == 1] |
Create array `a` containing integers from stdin | a.fromlist([int(val) for val in stdin.read().split()]) |
place '\' infront of each non-letter char in string `line` | print(re.sub('[_%^$]', '\\\\\\g<0>', line)) |
Get all `a` tags where the text starts with value `some text` using regex | doc.xpath("//a[starts-with(text(),'some text')]") |
convert a list of lists `a` into list of tuples of appropriate elements form nested lists | zip(*a) |
convert a list of strings `lst` to list of integers | [map(int, sublist) for sublist in lst] |
convert strings in list-of-lists `lst` to ints | [[int(x) for x in sublist] for sublist in lst] |
get index of elements in array `A` that occur in another array `B` | np.where(np.in1d(A, B))[0] |
create a list where each element is a dictionary with keys 'key1' and 'key2' and values corresponding to each value in the lists referenced by keys 'key1' and 'key2' in dictionary `d` | [{'key1': a, 'key2': b} for a, b in zip(d['key1'], d['key2'])] |
Get Last Day of the first month in 2002 | calendar.monthrange(2002, 1) |
Get Last Day of the second month in 2002 | calendar.monthrange(2008, 2) |
Get Last Day of the second month in 2100 | calendar.monthrange(2100, 2) |
Get Last Day of the month `month` in year `year` | calendar.monthrange(year, month)[1] |
Get Last Day of the second month in year 2012 | monthrange(2012, 2) |
Get Last Day of the first month in year 2000 | (datetime.date(2000, 2, 1) - datetime.timedelta(days=1)) |
Calling an external command "ls -l" | from subprocess import call |
Calling an external command "some_command with args" | os.system('some_command with args') |
Calling an external command "some_command < input_file | another_command > output_file" | os.system('some_command < input_file | another_command > output_file') |
Calling an external command "some_command with args" | stream = os.popen('some_command with args') |
Calling an external command "echo Hello World" | print(subprocess.Popen('echo Hello World', shell=True, stdout=subprocess.PIPE).stdout.read()) |
Calling an external command "echo Hello World" | print(os.popen('echo Hello World').read()) |
Calling an external command "echo Hello World" | return_code = subprocess.call('echo Hello World', shell=True) |
Calling an external command "ls -l" | call(['ls', '-l']) |
decode url `url` with utf8 and print it | print(urllib.parse.unquote(url).decode('utf8')) |
decode a urllib escaped url string `url` with `utf8` | url = urllib.parse.unquote(url).decode('utf8') |
delete letters from string '12454v' | """""".join(filter(str.isdigit, '12454v')) |
Update row values for a column `Season` using vectorized string operation in pandas | df['Season'].str.split('-').str[0].astype(int) |
sort a list of tuples `my_list` by second parameter in the tuple | my_list.sort(key=lambda x: x[1]) |
find indexes of all occurrences of a substring `tt` in a string `ttt` | [m.start() for m in re.finditer('(?=tt)', 'ttt')] |
find all occurrences of a substring in a string | [m.start() for m in re.finditer('test', 'test test test test')] |
split string `s` based on white spaces | re.findall('\\s+|\\S+', s) |
set columns `['race_date', 'track_code', 'race_number']` as indexes in dataframe `rdata` | rdata.set_index(['race_date', 'track_code', 'race_number']) |
recursively go through all subdirectories and files in `rootdir` | for (root, subFolders, files) in os.walk(rootdir):
pass |
sort a list of dictionary values by 'date' in reverse order | list.sort(key=lambda item: item['date'], reverse=True) |
display first 5 characters of string 'aaabbbccc' | """{:.5}""".format('aaabbbccc') |
unpack hexadecimal string `s` to a list of integer values | struct.unpack('11B', s) |
finding the index of an item 'foo' given a list `['foo', 'bar', 'baz']` containing it | [i for i, j in enumerate(['foo', 'bar', 'baz']) if j == 'foo'] |
generate all permutations of list `[1, 2, 3]` and list `[4, 5, 6]` | print(list(itertools.product([1, 2, 3], [4, 5, 6]))) |
generate all permutations of a list `[1, 2, 3]` | itertools.permutations([1, 2, 3]) |
substitute occurrences of unicode regex pattern u'\\p{P}+' with empty string '' in string `text` | return re.sub('\\p{P}+', '', text) |
manually throw/raise a `ValueError` exception with the message 'A very specific bad thing happened' | raise ValueError('A very specific bad thing happened') |
throw an exception "I know Python!" | raise Exception('I know Python!') |
Manually throw an exception "I know python!" | raise Exception('I know python!') |
throw a ValueError with message 'represents a hidden bug, do not catch this' | raise ValueError('represents a hidden bug, do not catch this') |
throw an Exception with message 'This is the exception you expect to handle' | raise Exception('This is the exception you expect to handle') |
throw a value error with message 'A very specific bad thing happened', 'foo', 'bar', 'baz' | raise ValueError('A very specific bad thing happened') |
throw a runtime error with message 'specific message' | raise RuntimeError('specific message') |
throw an assertion error with message "Unexpected value of 'distance'!", distance | raise AssertionError("Unexpected value of 'distance'!", distance) |
if Selenium textarea element `foo` is not empty, clear the field | driver.find_element_by_id('foo').clear() |
clear text from textarea 'foo' with selenium | driver.find_element_by_id('foo').clear() |
convert a number 2130706433 to ip string | socket.inet_ntoa(struct.pack('!L', 2130706433)) |
Rearrange the columns 'a','b','x','y' of pandas DataFrame `df` in mentioned sequence 'x' ,'y','a' ,'b' | df = df[['x', 'y', 'a', 'b']] |
call base class's __init__ method from the child class `ChildClass` | super(ChildClass, self).__init__(*args, **kwargs) |
sum of all values in a python dict `d` | sum(d.values()) |
convert python dictionary `your_data` to json array | json.dumps(your_data, ensure_ascii=False) |
assign an array of floats in range from 0 to 100 to a variable `values` | values = np.array([i for i in range(100)], dtype=np.float64) |
sort a list of dictionaries `list_of_dct` by values in an order `order` | sorted(list_of_dct, key=lambda x: order.index(list(x.values())[0])) |
change the case of the first letter in string `s` | return s[0].upper() + s[1:] |
join list of numbers `[1,2,3,4] ` to string of numbers. | """""".join([1, 2, 3, 4]) |
delete every non `utf-8` characters from a string `line` | line = line.decode('utf-8', 'ignore').encode('utf-8') |
execute a command `command ` in the terminal from a python script | os.system(command) |
MySQL execute query 'SELECT * FROM foo WHERE bar = %s AND baz = %s' with parameters `param1` and `param2` | c.execute('SELECT * FROM foo WHERE bar = %s AND baz = %s', (param1, param2)) |
Parse string `datestr` into a datetime object using format pattern '%Y-%m-%d' | dateobj = datetime.datetime.strptime(datestr, '%Y-%m-%d').date() |
How can I send a signal from a python program? | os.kill(os.getpid(), signal.SIGUSR1) |
Decode Hex String in Python 3 | bytes.fromhex('4a4b4c').decode('utf-8') |
check if all elements in a list are identical | all(x == myList[0] for x in myList) |
Format string dynamically | print('%*s : %*s' % (20, 'Python', 20, 'Very Good')) |
How to convert a string from CP-1251 to UTF-8? | d.decode('cp1251').encode('utf8') |
How I can get rid of None values in dictionary? | res = {k: v for k, v in list(kwargs.items()) if v is not None} |
How I can get rid of None values in dictionary? | res = dict((k, v) for k, v in kwargs.items() if v is not None) |
Python: how to get the final output of multiple system commands? | subprocess.check_output('ps -ef | grep something | wc -l', shell=True) |
splitting and concatenating a string | """""".join(['a', 'b', 'c']) |
Finding the intersection between two series in Pandas | pd.Series(list(set(s1).intersection(set(s2)))) |
Sending http headers with python | client.send('HTTP/1.0 200 OK\r\n') |
Python -Remove Time from Datetime String | then = datetime.datetime.strptime(when, '%Y-%m-%d').date() |
How do I split a multi-line string into multiple lines? | inputString.split('\n') |
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