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shuffle a list within a specific range python,"random.sample(list(range(1, 10)), 5)" |
pandas: how can i use the apply() function for a single column?,df['a'] = df['a'].apply(lambda x: x + 1) |
secondary axis with twinx(): how to add to legend?,"ax.plot(np.nan, '-r', label='temp')" |
reading and running a mathematical expression in python,"eval(""__import__('sys').exit(1)"")" |
how to slice and extend a 2d numpy array?,"q.T.reshape(-1, k, n).swapaxes(1, 2).reshape(-1, k)" |
get full path of current directory,os.path.dirname(os.path.abspath(__file__)) |
get the dimensions of array `a`,N.shape(a) |
subtitles within matplotlib legend,plt.show() |
how do you extract a column from a multi-dimensional array?,[row[1] for row in A] |
how can i execute python code in a virtualenv from matlab,system('python myscript.py') |
twisted server for multiple clients,reactor.run() |
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] |
how to split a string into integers in python?,' \r 42\n\r \t\n \r0\n\r\n'.split() |
delete an item with key `key` from `mydict`,"try: |
del mydict[key] |
except KeyError: |
pass |
try: |
del mydict[key] |
except KeyError: |
pass" |
finding which rows have all elements as zeros in a matrix with numpy,np.where(~a.any(axis=1)) |
how to write unix end of line characters in windows using python,"f = open('file.txt', 'wb')" |
what's the best way to split a string into fixed length chunks and work with them in python?,"return (string[0 + i:length + i] for i in range(0, len(string), length))" |
how to create nested list from flatten list?,"[['a', 'b', 'c'], ['d', 'e', 'f', 'g'], ['d', 's', 'd', 'a']]" |
python: using a dictionary to count the items in a list,"Counter(['apple', 'red', 'apple', 'red', 'red', 'pear'])" |
what is the reason behind the advice that the substrings in regex should be ordered based on length?,regex.findall(string) |
get current requested url,self.request.url |
print number `value` as thousands separators,"'{:,}'.format(value)" |
python: make last item of array become the first,a[-1:] + a[:-1] |
empty a list `lst`,del lst1[:] |
how to check if all elements in a tuple or list are in another?,"all(i in (1, 2, 3, 4, 5) for i in (1, 6))" |
one-line expression to map dictionary to another,"[(m.get(k, k), v) for k, v in list(d.items())]" |
how to redirect stderr in python?,"sys.stderr = open('C:\\err.txt', 'w')" |
function to get the size of object,len() |
python: converting string into decimal number,"result = [float(x.strip(' ""')) for x in A1]" |
how to print a pdf file to stdout using python?,print(pdf_file.read()) |
python pandas - how to filter multiple columns by one value,"df[(df.iloc[:, -12:] == -1).all(axis=1)]" |
how to create a dataframe while preserving order of the columns?,"df = df[['foo', 'bar']]" |
matplotlib - hiding specific ticks on x-axis,plt.show() |
pandas - intersection of two data frames based on column entries,s1.dropna(inplace=True) |
insert string `foo` at position `0` of list `list`,"list.insert(0, 'foo')" |
how to clear the screen in python,os.system('clear') |
how do i transform a multi-level list into a list of strings in python?,"from functools import reduce |
[reduce(lambda x, y: x + y, i) for i in a]" |
python - insert numbers in string between quotes,"re.sub('(\\d+)', '""\\1""', 'This is number 1 and this is number 22')" |
mysql compress() with sqlalchemy,session.commit() |
how to remove the space between subplots in matplotlib.pyplot?,ax.set_xticklabels([]) |
splitting numpy array into 2 arrays,"np.hstack((A[:, :1], A[:, 3:]))" |
how to store os.system() output in a variable or a list in python,os.system('echo X') |
how do i get the name from a named tuple in python?,ham.__class__.__name__ |
"how do i sort a list with ""nones last""","sorted(lis, key=lambda a: Infinity() if a['name'] is None else a['name'])" |
django multidb: write to multiple databases,"super(MyUser, self).save(using='database_2')" |
how to shift a string to right in python?,print(' '.join([s.split()[-1]] + s.split()[:-1])) |
search for string 'blabla' in txt file 'example.txt',"if ('blabla' in open('example.txt').read()): |
pass" |
extracting date from a string in python,"date = datetime.strptime(match.group(), '%Y-%m-%d').date()" |
implementing breadcrumbs in python using flask?,app.run() |
get the absolute path of a running python script,os.path.abspath(__file__) |
matplotlib change marker size to 500,"scatter(x, y, s=500, color='green', marker='h')" |
how to make arrow that loops in matplotlib?,plt.show() |
how to change the layout of a gtk application on fullscreen?,win.show_all() |
local import statements in python,"foo = __import__('foo', globals(), locals(), [], -1)" |
accessing jvm from python,ctypes.CDLL('C:\\Program Files (x86)\\Java\\jre1.8.0_40\\bin\\client\\jvm.dll') |
django rest framework: basic auth without debug,ALLOWED_HOSTS = ['*'] |
how to access pandas groupby dataframe by key,df.loc[gb.groups['foo']] |
how to draw line inside a scatter plot,ax.set_xlabel('FPR or (1 - specificity)') |
how to group similar items in a list?,"[list(g) for _, g in itertools.groupby(test, lambda x: x.split('_')[0])]" |
count the number of non-nan elements in a numpy ndarray matrix `data`,np.count_nonzero(~np.isnan(data)) |
split a string `42 0` by white spaces.,"""""""42 0"""""".split()" |
python: fetch first 10 results from a list,"[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]" |
how to convert this list into dictionary in python?,"dict_list = {'a': 1, 'b': 2, 'c': 3, 'd': 4}" |
efficient python array with 100 million zeros?,a[i] += 1 |
can i export a python pandas dataframe to ms sql?,conn.commit() |
how to copy a file to a remote server in python using scp or ssh?,ssh.close() |
scatter plot in matplotlib,"matplotlib.pyplot.scatter(x, y)" |
how to do this join query in django,products = Product.objects.filter(categories__pk=1).select_related() |
correctly reading text from windows-1252(cp1252) file in python,print('J\xe2nis'.encode('utf-8')) |
remove all square brackets from string 'abcd[e]yth[ac]ytwec',"re.sub('\\[.*?\\]', '', 'abcd[e]yth[ac]ytwec')" |
match regex '[a-za-z][\\w-]*$' on string '!a_b',"re.match('[a-zA-Z][\\w-]*$', '!A_B')" |
how to create a filename with a trailing period in windows?,"open('\\\\?\\C:\\whatever\\test.', 'w')" |
is it possible to plot timelines with matplotlib?,ax.yaxis.set_visible(False) |
converting a list of strings in a numpy array in a faster way,"map(float, i.split()[:2])" |
using session in flask app,app.run() |
parse string `s` to int when string contains a number,int(''.join(c for c in s if c.isdigit())) |
sort list `a` in ascending order based on its elements' float values,"a = sorted(a, key=lambda x: float(x))" |
how to re.sub() a optional matching group using regex in python?,"re.sub('url(#*.*)', 'url\\1', test1)" |
finding the biggest key in a python dictionary,"sorted(list(things.keys()), key=lambda x: things[x]['weight'], reverse=True)[:2]" |
nonlinear colormap with matplotlib,plt.show() |
"split string with comma (,) and remove whitespace from a string 'my_string'","[item.strip() for item in my_string.split(',')]" |
python regex to find a string in double quotes within a string,"""""""String 1,String 2,String3""""""" |
understanding list comprehension for flattening list of lists in python,[item for sublist in list_of_lists for item in sublist if valid(item)] |
construct single numpy array from smaller arrays of different sizes,"np.hstack([np.arange(i, j) for i, j in zip(start, stop)])" |
how to index a pandas dataframe using locations wherever the data changes,"df.drop_duplicates(keep='last', subset=['valueA', 'valueB'])" |
split python flask app into multiple files,app.run() |
how to fill missing values with a tuple,"df[0].apply(lambda x: (0, 0) if x is np.nan else x)" |
construct pandas dataframe from a list of tuples,"df = pandas.DataFrame(data, columns=['R_Number', 'C_Number', 'Avg', 'Std'])" |
"in django, check if a user is in a group 'member'",return user.groups.filter(name='Member').exists() |
random list with replacement from python list of lists,[random.choice(list_of_lists) for _ in range(sample_size)] |
get a list of all items in list `j` with values greater than `5`,[x for x in j if x >= 5] |
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