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neulab

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conala

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How do I load a file into the python console?

load a file `file.py` into the python console

exec(compile(open('file.py').read(), 'file.py', 'exec'))

Get the number of rows in table using SQLAlchemy

SQLAlchemy count the number of rows in table `Congress`

rows = session.query(Congress).count()

Execute Shell Script from python with variable

subprocess.call(['test.sh', str(domid)])

How to read a .xlsx file using the pandas Library in iPython?

read excel file `file_name` using pandas

dfs = pd.read_excel(file_name, sheetname=None)

Reading hex to double-precision float python

unpack the binary data represented by the hexadecimal string '4081637ef7d0424a' to a float

struct.unpack('d', binascii.unhexlify('4081637ef7d0424a'))

Indexing numpy array with another numpy array

Get index of numpy array `a` with another numpy array `b`

a[tuple(b)]

How to find all possible sequences of elements in a list?

find all possible sequences of elements in a list `[2, 3, 4]`

map(list, permutations([2, 3, 4]))

Sort a list in python based on another sorted list

sort a list `unsorted_list` based on another sorted list `presorted_list`

sorted(unsorted_list, key=presorted_list.index)

How to get yesterday in python

datetime.datetime.now() - datetime.timedelta(days=1)

Creating a zero-filled pandas data frame

create a dataframe `d` filled with zeros with indices from 0 to length of `data` and column names from `feature_list`

d = pd.DataFrame(0, index=np.arange(len(data)), columns=feature_list)

string find

find the index of sub string 'World' in `x`

x.find('World')

string find

find the index of sub string 'Aloha' in `x`

x.find('Aloha')

string find

find the index of sub string 'cc' in string 'sdfasdf'

'sdfasdf'.index('cc')

string find

find the index of sub string 'df' in string 'sdfasdf'

'sdfasdf'.index('df')

string find

find the index of sub string 'a' in string `str`

str.find('a')

string find

find the index of sub string 'g' in string `str`

str.find('g')

string find

find the index of sub string 's' in string `str` starting from index 11

str.find('s', 11)

string find

find the index of sub string 's' in string `str` starting from index 15

str.find('s', 15)

string find

find the index of sub string 's' in string `str` starting from index 16

str.find('s', 16)

string find

find the index of sub string 's' in string `str` starting from index 11 and ending at index 14

str.find('s', 11, 14)

Sort list of date strings

sort list of date strings 'd'

sorted(d, key=lambda x: datetime.datetime.strptime(x, '%m-%Y'))

Regular expression in Python sentence extractor

Get all the sentences from a string `text` using regex

re.split('\\.\\s', text)

Regular expression in Python sentence extractor

re.split('\\.\\s', re.sub('\\.\\s*$', '', text))

Python - How to cut a string in Python?

get all characters in string 'foobar' up to the fourth index

"""foobar"""[:4]

Python - How to cut a string in Python?

cut a string by delimiter '&'

s.rfind('&')

Python - How to cut a string in Python?

cut a string using delimiter '&'

s[:s.rfind('&')]

Using a variable in xpath in Python Selenium

find a tag `option` whose `value` attribute is `state` in selenium

driver.find_element_by_xpath("//option[@value='" + state + "']").click()

append to a file

append line "appended text" to file "test.txt"

with open('test.txt', 'a') as myfile: myfile.write('appended text')

append to a file

append line "cool beans..." to file "foo"

with open('foo', 'a') as f: f.write('cool beans...')

append to a file

append to file 'test1' content 'koko'

with open('test1', 'ab') as f: pass

append to a file

append to file 'test' content 'koko'

open('test', 'a+b').write('koko')

How can I split a string into tokens?

split string 'x+13.5*10x-4e1' into tokens

print([i for i in re.split('([\\d.]+|\\W+)', 'x+13.5*10x-4e1') if i])

Python: Check if a string contains chinese character?

Find all Chinese characters in string `ipath`

re.findall('[\u4e00-\u9fff]+', ipath)

String splitting in Python

split string `s` by letter 's'

s.split('s')

How to start a background process in Python?

run shell command 'rm -r some.file' in the background

subprocess.Popen(['rm', '-r', 'some.file'])

Elegant way to transform a list of dict into a dict of dicts

convert a list of dictionaries `listofdict into a dictionary of dictionaries

dict((d['name'], d) for d in listofdict)

print date in a regular format

print current date and time in a regular format

datetime.datetime.now().strftime('%Y-%m-%d %H:%M')

print date in a regular format

print current date and time in a regular format

time.strftime('%Y-%m-%d %H:%M')

Finding consecutive consonants in a word

find consecutive consonants in a word `CONCENTRATION` using regex

re.findall('[bcdfghjklmnpqrstvwxyz]+', 'CONCERTATION', re.IGNORECASE)

How do I get a list of indices of non zero elements in a list?

get a list of indices of non zero elements in a list `a`

[i for i, e in enumerate(a) if e != 0]

How to get integer values from a string in Python?

get multiple integer values from a string 'string1'

map(int, re.findall('\\d+', string1))

How can I know python's path under windows?

get the path of Python executable under windows

os.path.dirname(sys.executable)

Moving x-axis to the top of a plot in matplotlib

move an x-axis label to the top of a plot `ax` in matplotlib

ax.xaxis.set_label_position('top')

Moving x-axis to the top of a plot in matplotlib

move x-axis to the top of a plot `ax`

ax.xaxis.tick_top()

Moving x-axis to the top of a plot in matplotlib

Move x-axis of the pyplot object `ax` to the top of a plot in matplotlib

ax.xaxis.set_ticks_position('top')

Parsing non-zero padded timestamps in Python

parse string '2015/01/01 12:12am' to DateTime object using format '%Y/%m/%d %I:%M%p'

datetime.strptime('2015/01/01 12:12am', '%Y/%m/%d %I:%M%p')

Open images

Open image 'picture.jpg'

img = Image.open('picture.jpg') img.show()

Open images

Open image "picture.jpg"

img = Image.open('picture.jpg') Img.show

How do I abort the execution of a Python script?

terminate the script using status value 0

sys.exit(0)

How do I abort the execution of a Python script?

abort the execution of the script using message 'aa! errors!'

sys.exit('aa! errors!')

How do I abort the execution of a Python script?

abort the execution of a python script

sys.exit()

Find maximum with limited length in a list

find maximum with lookahead = 4 in a list `arr`

[max(abs(x) for x in arr[i:i + 4]) for i in range(0, len(arr), 4)]

How to set the current working directory in Python?

set the current working directory to 'c:\\Users\\uname\\desktop\\python'

os.chdir('c:\\Users\\uname\\desktop\\python')

How to set the current working directory in Python?

set the current working directory to path `path`

os.chdir(path)

How to remove all integer values from a list in python

get a list `no_integers` of all the items in list `mylist` that are not of type `int`

no_integers = [x for x in mylist if not isinstance(x, int)]

How do I match contents of an element in XPath (lxml)?

match contents of an element to 'Example' in xpath (lxml)

tree.xpath(".//a[text()='Example']")[0].tag

convert dictionaries into string python

concatenate key/value pairs in dictionary `a` with string ', ' into a single string

""", """.join([(str(k) + ' ' + str(v)) for k, v in list(a.items())])

Detecting non-ascii characters in unicode string

Strip all non-ASCII characters from a unicode string, `\xa3\u20ac\xa3\u20ac`

print(set(re.sub('[\x00-\x7f]', '', '\xa3\u20ac\xa3\u20ac')))

Detecting non-ascii characters in unicode string

Get all non-ascii characters in a unicode string `\xa3100 is worth more than \u20ac100`

print(re.sub('[\x00-\x7f]', '', '\xa3100 is worth more than \u20ac100'))

Convert a String representation of a Dictionary to a dictionary?

build a dict of key:value pairs from a string representation of a dict, `{'muffin' : 'lolz', 'foo' : 'kitty'}`

ast.literal_eval("{'muffin' : 'lolz', 'foo' : 'kitty'}")

Easiest way to remove unicode representations from a string in python 3?

Print string `t` with proper unicode representations

print(t.decode('unicode_escape'))

String encoding and decoding from possibly latin1 and utf8

Normalize string `str` from 'cp1252' code to 'utf-8' code

print(str.encode('cp1252').decode('utf-8').encode('cp1252').decode('utf-8'))

merge lists into a list of tuples

merge lists `list_a` and `list_b` into a list of tuples

zip(list_a, list_b)

merge lists into a list of tuples

merge lists `a` and `a` into a list of tuples

list(zip(a, b))

python pandas dataframe to dictionary

convert pandas DataFrame `df` to a dictionary using `id` field as the key

df.set_index('id').to_dict()

python pandas dataframe to dictionary

convert pandas dataframe `df` with fields 'id', 'value' to dictionary

df.set_index('id')['value'].to_dict()

Can I sort text by its numeric value in Python?

sorted(list(mydict.items()), key=lambda a: map(int, a[0].split('.')))

How can I remove text within parentheses with a regex?

remove parentheses and text within it in string `filename`

re.sub('\\([^)]*\\)', '', filename)

How can I tell if a string only contains letter AND spaces

Check if string 'a b' only contains letters and spaces

"""a b""".replace(' ', '').isalpha()

Add SUM of values of two LISTS into new LIST

sum each element `x` in list `first` with element `y` at the same index in list `second`.

[(x + y) for x, y in zip(first, second)]

How to sort a Python dictionary by value?

sort a python dictionary `a_dict` by element `1` of the value

sorted(list(a_dict.items()), key=lambda item: item[1][1])

How to exclude a character from a regex group?

re.compile('[^a-zA-Z0-9-]+')

Get index of the top n values of a list in python

get index of the biggest 2 values of a list `a`

sorted(list(range(len(a))), key=lambda i: a[i])[-2:]

Get index of the top n values of a list in python

get indexes of the largest `2` values from a list `a` using itemgetter

zip(*sorted(enumerate(a), key=operator.itemgetter(1)))[0][-2:]

Get index of the top n values of a list in python

get the indexes of the largest `2` values from a list of integers `a`

sorted(list(range(len(a))), key=lambda i: a[i], reverse=True)[:2]

How to get the index with the key in Python dictionary?

get index of key 'c' in dictionary `x`

list(x.keys()).index('c')

How to print +1 in Python, as +1 (with plus sign) instead of 1?

Print +1 using format '{0:+d}'

print('{0:+d}'.format(score))

Remove adjacent duplicate elements from a list

remove adjacent duplicate elements from a list `[1, 2, 2, 3, 2, 2, 4]`

[k for k, g in itertools.groupby([1, 2, 2, 3, 2, 2, 4])]

Converting a String to List in Python

split string "0,1,2" based on delimiter ','

"""0,1,2""".split(',')

Converting a String to List in Python

convert the string '0,1,2' to a list of integers

[int(x) for x in '0,1,2'.split(',')]

Python: Convert list of key-value tuples into dictionary?

convert list of key-value tuples `[('A', 1), ('B', 2), ('C', 3)]` into dictionary

dict([('A', 1), ('B', 2), ('C', 3)])

How to write a multidimensional array to a text file?

save numpy array `x` into text file 'test.txt'

np.savetxt('test.txt', x)

How to store os.system() output in a variable or a list in python

store the output of command 'ls' in variable `direct_output`

direct_output = subprocess.check_output('ls', shell=True)

Select everything but a list of columns from pandas dataframe

get all column name of dataframe `df` except for column 'T1_V6'

df[df.columns - ['T1_V6']]

How to count values in a certain range in a Numpy array?

get count of values in numpy array `a` that are between values `25` and `100`

((25 < a) & (a < 100)).sum()

how to get day name in datetime in python

Get day name from a datetime object

date.today().strftime('%A')

Python regular expression match whole word

re.search('\\bis\\b', your_string)

Python: How do I format a date in Jinja2?

Jinja parse datetime object `car.date_of_manufacture` to use format pattern `datetime`

{{car.date_of_manufacture | datetime}}

Python: How do I format a date in Jinja2?

Get the date object `date_of_manufacture` of object `car` in string format '%Y-%m-%d'

{{car.date_of_manufacture.strftime('%Y-%m-%d')}}

Making a flat list out of list of lists

make a flat list from list of lists `sublist`

[item for sublist in l for item in sublist]

Making a flat list out of list of lists

make a flat list from list of lists `list2d`

list(itertools.chain(*list2d))

Making a flat list out of list of lists

make a flat list from list of lists `list2d`

list(itertools.chain.from_iterable(list2d))

Convert int to ASCII and back in Python

convert ascii value 'a' to int

ord('a')

Python: use regular expression to remove the white space from all lines

replace white spaces in string ' a\n b\n c\nd e' with empty string ''

re.sub('(?m)^[^\\S\\n]+', '', ' a\n b\n c\nd e')

Python: use regular expression to remove the white space from all lines

remove white spaces from all the lines using a regular expression in string 'a\n b\n c'

re.sub('(?m)^\\s+', '', 'a\n b\n c')

Python: Assign each element of a List to a separate Variable

destruct elements of list `[1, 2, 3]` to variables `a`, `b` and `c`

a, b, c = [1, 2, 3]

Python split a list into subsets based on pattern

split list `mylist` into a list of lists whose elements have the same first five characters

[list(v) for k, v in itertools.groupby(mylist, key=lambda x: x[:5])]

Regular expression substitution in Python

remove all instances of parenthesesis containing text beginning with `as ` from string `line`

line = re.sub('\\(+as .*?\\) ', '', line)

How to skip the extra newline while printing lines read from a file?

skip the newline while printing `line`

print(line.rstrip('\n'))

Get index values of Pandas DataFrame as list?

get index values of pandas dataframe `df` as list

df.index.values.tolist()