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How do I split a multi-line string into multiple lines? | ' a \n b \r\n c '.split('\n') |
How to join mixed list (array) (with integers in it) in Python? | """:""".join(str(x) for x in b) |
Fastest way to get the first object from a queryset in django? | Entry.objects.filter()[:1].get() |
How to calculate the sum of all columns of a 2D numpy array (efficiently) | a.sum(axis=1) |
Python, how to enable all warnings? | warnings.simplefilter('always') |
Python printing without commas | print(' '.join(map(str, l))) |
OSError: [WinError 193] %1 is not a valid Win32 application | subprocess.call(['python.exe', 'hello.py', 'htmlfilename.htm']) |
How can I parse a time string containing milliseconds in it with python? | time.strptime('30/03/09 16:31:32.123', '%d/%m/%y %H:%M:%S.%f') |
How can I convert a string with dot and comma into a float number in Python | my_float = float(my_string.replace(',', '')) |
How can I convert a string with dot and comma into a float number in Python | float('123,456.908'.replace(',', '')) |
In Python script, how do I set PYTHONPATH? | sys.path.append('/path/to/whatever') |
Determining the unmatched portion of a string using a regex in Python | re.split('(\\W+)', 'Words, words, words.') |
How to read data from Excel and write it to text file line by line? | file = open('Output.txt', 'a') |
download a file over HTTP | urllib.request.urlretrieve('http://www.example.com/songs/mp3.mp3', 'mp3.mp3') |
download a file over HTTP | u = urllib.request.urlopen(url) |
download a file over HTTP | response = urllib.request.urlopen('http://www.example.com/')
html = response.read() |
download a file over HTTP | r = requests.get(url) |
download a file over HTTP | response = requests.get(url, stream=True) |
Python's argparse to show program's version with prog and version string formatting | parser.add_argument('--version', action='version', version='%(prog)s 2.0') |
Remove key from dictionary in Python returning new dictionary | {i: d[i] for i in d if i != 'c'} |
Merging two pandas dataframes | pd.merge(split_df, csv_df, on=['key'], suffixes=('_left', '_right')) |
Python regular expression split() string | s.split(' ', 4) |
How to read keyboard-input? | input('Enter your input:') |
Auto reloading python Flask app upon code changes | app.run(debug=True) |
Python save list and read data from file | pickle.dump(mylist, open('save.txt', 'wb')) |
Numpy: Multiplying a matrix with a 3d tensor -- Suggestion | scipy.tensordot(P, T, axes=[1, 1]).swapaxes(0, 1) |
How to create nested lists in python? | numpy.zeros((3, 3, 3)) |
Python: Cut off the last word of a sentence? | """ """.join(content.split(' ')[:-1]) |
Numpy convert scalars to arrays | x = np.asarray(x).reshape(1, -1)[(0), :] |
Finding the sum of a nested list of ints | sum(sum(i) if isinstance(i, list) else i for i in L) |
Convert hex to float | struct.unpack('!f', '470FC614'.decode('hex'))[0] |
Python: Perform an operation on each dictionary value | my_dict.update((x, y * 2) for x, y in list(my_dict.items())) |
Running bash script from within python | subprocess.call('sleep.sh', shell=True) |
How would you make a comma-separated string from a list? | """,""".join(l) |
How would you make a comma-separated string from a list? | myList = ','.join(map(str, myList)) |
Print a list in reverse order with range()? | list(reversed(list(range(10)))) |
How can i subtract two strings in python? | print('lamp, bag, mirror'.replace('bag,', '')) |
python reverse tokens in a string | """.""".join(s.split('.')[::-1]) |
converting epoch time with milliseconds to datetime | datetime.datetime.fromtimestamp(s).strftime('%Y-%m-%d %H:%M:%S.%f') |
converting epoch time with milliseconds to datetime | time.strftime('%Y-%m-%d %H:%M:%S', time.gmtime(1236472051807 / 1000.0)) |
Getting the date of 7 days ago from current date in python | (datetime.datetime.now() - datetime.timedelta(days=7)).date() |
How can I sum a column of a list? | print(sum(row[column] for row in data)) |
How can I sum a column of a list? | [sum(row[i] for row in array) for i in range(len(array[0]))] |
How to encode text to base64 in python | base64.b64encode(bytes('your string', 'utf-8')) |
How can I combine dictionaries with the same keys in python? | dict((k, [d[k] for d in dicts]) for k in dicts[0]) |
How can I combine dictionaries with the same keys in python? | {k: [d[k] for d in dicts] for k in dicts[0]} |
How do I get the url parameter in a Flask view | request.args['myParam'] |
Identify duplicate values in a list in Python | [k for k, v in list(Counter(mylist).items()) if v > 1] |
How do you modify sys.path in Google App Engine (Python)? | sys.path.insert(1, os.path.join(os.path.dirname(__file__), 'apps')) |
How do you modify sys.path in Google App Engine (Python)? | sys.path.append(os.path.join(os.path.dirname(__file__), 'subdir')) |
Insert Null into SQLite3 in Python | db.execute("INSERT INTO present VALUES('test2', ?, 10)", (None,)) |
Flattening a shallow list in Python | [image for menuitem in list_of_menuitems for image in menuitem] |
Append elements of a set to a list in Python | a.extend(b) |
Append elements of a set to a list in Python | a.extend(list(b)) |
Python, Pandas : write content of DataFrame into text File | np.savetxt('c:\\data\\np.txt', df.values, fmt='%d') |
Python, Pandas : write content of DataFrame into text File | df.to_csv('c:\\data\\pandas.txt', header=None, index=None, sep=' ', mode='a') |
how to get the last part of a string before a certain character? | print(x.rpartition('-')[0]) |
how to get the last part of a string before a certain character? | print(x.rsplit('-', 1)[0]) |
FTP upload files Python | ftp.storlines('STOR ' + filename, open(filename, 'r')) |
Write value to hidden element with selenium python script | browser.execute_script("document.getElementById('XYZ').value+='1'") |
Combining two numpy arrays to form an array with the largest value from each array | np.maximum([2, 3, 4], [1, 5, 2]) |
How to print an entire list while not starting by the first item | print(l[3:] + l[:3]) |
loop over files | for fn in os.listdir('.'):
if os.path.isfile(fn):
pass |
loop over files | for (root, dirs, filenames) in os.walk(source):
for f in filenames:
pass |
Create random list of integers in Python | [int(1000 * random.random()) for i in range(10000)] |
Using %f with strftime() in Python to get microseconds | datetime.datetime.now().strftime('%H:%M:%S.%f') |
Build a GQL query (for Google App Engine) that has a condition on ReferenceProperty | db.GqlQuery('SELECT * FROM Schedule WHERE station = $1', foo.key()) |
How to filter rows in pandas by regex | df.b.str.contains('^f') |
What is the best way to print a table with delimiters in Python | print('\n'.join('\t'.join(str(col) for col in row) for row in tab)) |
Pandas: Delete rows based on multiple columns values | df.set_index(list('BC')).drop(tuples, errors='ignore').reset_index() |
String Formatting in Python 3 | """({:d} goals, ${:d})""".format(self.goals, self.penalties) |
String Formatting in Python 3 | """({} goals, ${})""".format(self.goals, self.penalties) |
String Formatting in Python 3 | """({0.goals} goals, ${0.penalties})""".format(self) |
Convert list of lists to list of integers | [int(''.join(str(d) for d in x)) for x in L] |
Convert list of lists to list of integers | [''.join(str(d) for d in x) for x in L] |
Convert list of lists to list of integers | L = [int(''.join([str(y) for y in x])) for x in L] |
How to write a list to a file with newlines in Python3 | myfile.write('\n'.join(lines)) |
Removing an element from a list based on a predicate | [x for x in ['AAT', 'XAC', 'ANT', 'TTA'] if 'X' not in x and 'N' not in x] |
python regular expression to remove repeated words | text = re.sub('\\b(\\w+)( \\1\\b)+', '\\1', text) |
Counting non zero values in each column of a dataframe in python | df.astype(bool).sum(axis=1) |
Python match string if it does not start with X | re.search('(?<!Distillr)\\\\AcroTray\\.exe', 'C:\\SomeDir\\AcroTray.exe') |
String to list in Python | """QH QD JC KD JS""".split() |
Parsing XML in Python with regex | print(re.search('>.*<', line).group(0)) |
How to empty a file using Python | open(filename, 'w').close() |
how to convert a string date into datetime format in python? | datetime.datetime.strptime(string_date, '%Y-%m-%d %H:%M:%S.%f') |
What's the fastest way to locate a list element within a list in python? | [index for index, item in enumerate(thelist) if item[0] == '332'] |
Python: trying to lower a string and remove non-alphanumeric characters aside from space | re.sub('[^\\sa-zA-Z0-9]', '', text).lower().strip() |
Python: trying to lower a string and remove non-alphanumeric characters aside from space | re.sub('(?!\\s)[\\W_]', '', text).lower().strip() |
Subscripting text in matplotlib labels | plt.plot(x, y, label='H\u2082O') |
Subscripting text in matplotlib labels | plt.plot(x, y, label='$H_2O$') |
Looping over a list in Python | [x for x in mylist if len(x) == 3] |
Initialize a list of objects in Python | lst = [Object() for _ in range(100)] |
Initialize a list of objects in Python | lst = [Object() for i in range(100)] |
selenium how to get the content of href within some targeted class | self.driver.find_element_by_css_selector('.someclass a').get_attribute('href') |
Joining Table/DataFrames with common Column in Python | df1.merge(df2, on='Date_Time') |
insert variable values into a string in python | 'first string is: %s, second one is: %s' % (str1, 'geo.tif') |
Split a string by a delimiter in python | [x.strip() for x in '2.MATCHES $$TEXT$$ STRING'.split('$$TEXT$$')] |
check if a directory exists and create it if necessary | if (not os.path.exists(directory)):
os.makedirs(directory) |
check if a directory exists and create it if necessary | os.makedirs(path) |
check if a directory exists and create it if necessary | distutils.dir_util.mkpath(path) |
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