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access item in a list of lists

list1[0][2]

load csv into 2d matrix with numpy for plotting

numpy.loadtxt(open('test.csv', 'rb'), delimiter=',', skiprows=1)

how to delete an object using django rest framework

url('^delete/(?P<pk>\\d+)', views.EventDetail.as_view(), name='delete_event'),

get data from the meta tags using beautifulsoup

soup.findAll(attrs={'name': 'description'})

numpy array assignment using slicing

values = np.array([i for i in range(100)], dtype=np.float64)

how to add a second x-axis in matplotlib

plt.show()

how do i remove identical items from a list and sort it in python?

sorted(set(my_list))

insert string `string1` after each character of `string2`

string2.replace('', string1)[len(string1):-len(string1)]

find indices of large array if it contains values in smaller array

np.where(np.in1d(a, b))

how do i slice a numpy array to get both the first and last two rows

x[[0, 1, -2, -1]]

sort a list of tuples `my_list` by second parameter in the tuple

my_list.sort(key=lambda x: x[1])

sorting list in python

l.sort(key=alphanum_key)

convert rows in pandas data frame `df` into list

df.apply(lambda x: x.tolist(), axis=1)

best way to delete a django model instance after a certain date

print(Event.objects.filter(date__lt=datetime.datetime.now()).delete())

apply logical operator 'and' to all elements in list `a_list`

all(a_list)

apply multiple functions to multiple groupby columns

df.groupby('GRP').agg(f)

reverse sort items in dictionary `mydict` by value

sorted(iter(mydict.items()), key=itemgetter(1), reverse=True)

django database query: how to filter objects by date range?

Sample.objects.filter(date__year='2011', date__month='01')

python regular expression matching a multiline block of text

re.compile('^(.+)\\n((?:\\n.+)+)', re.MULTILINE)

access index of last element in data frame

df['date'][df.index[-1]]

how to convert triangle matrix to square in numpy?

np.where(np.eye(A.shape[0], dtype=bool), A, A.T + A)

get a list `c` by subtracting values in one list `b` from corresponding values in another list `a`

C = [(a - b) for a, b in zip(A, B)]

lowercase keys and values in dictionary `{'my key': 'my value'}`

{k.lower(): v.lower() for k, v in list({'My Key': 'My Value'}.items())}

how to "scale" a numpy array?

np.kron(a, np.ones((n, n)))

beautiful soup [python] and the extracting of text in a table

table = soup.find('table', attrs={'class': 'bp_ergebnis_tab_info'})

regex to match 'lol' to 'lolllll' and 'omg' to 'omggg', etc

re.sub('g+', 'g', 'omgggg')

in python how can i declare a dynamic array

lst = [1, 2, 3]

sort a list in python based on another sorted list

sorted(unsorted_list, key=presorted_list.index)

mmap file inquiry for a blank file in python

sys.stdout.flush()

python list of dictionaries[int : tuple] sum

sum(v[1] for d in myList for v in d.values())

find the mean of elements in list `l`

sum(l) / float(len(l))

convert strings to int or float in python 3?

print('2 + ' + str(integer) + ' = ' + str(rslt))

interleaving lists in python

[x for t in zip(list_a, list_b) for x in t]

is it possible to run pygame as a cronjob?

pygame.display.set_mode((1, 1))

using regular expression to split string in python

[i[0] for i in re.findall('((\\d)(?:[()]*\\2*[()]*)*)', s)]

read a single character from stdin

sys.stdin.read(1)

trimming a string " hello"

' Hello'.strip()

array in python with arbitrary index

[100, None, None, None, None, None, None, None, None, None, 200]

rendering text with multiple lines in pygame

pygame.display.update()

execute a file with arguments in python shell

subprocess.call(['./abc.py', arg1, arg2])

add single element to array in numpy

numpy.append(a, a[0])

how to generate all permutations of a list in python

print(list(itertools.permutations([1, 2, 3, 4], 2)))

get a unique computer id in python on windows and linux

subprocess.Popen('dmidecode.exe -s system-uuid'.split())

efficiently construct pandas dataframe from large list of tuples/rows

pandas.DataFrame(initialload, columns=list_of_column_names)

how to use jenkins environment variables in python script

qualifier = os.environ['QUALIFIER']

what is the best way to convert a printed list in python back into an actual list

ast.literal_eval(a)

getting today's date in yyyy-mm-dd in python?

datetime.datetime.today().strftime('%Y-%m-%d')

drawing a rectangle or bar between two points in a 3d scatter plot in python and matplotlib

matplotlib.pyplot.show()

best way to extract subset of key-value pairs from python dictionary object

{k: bigdict[k] for k in ('l', 'm', 'n')}

how to split a string into integers in python?

l = [int(x) for x in s.split()]

what's the usage to add a comma after self argument in a class method?

{'top': ['foo', 'bar', 'baz'], 'bottom': ['qux']}

plotting dates on the x-axis with python's matplotlib

plt.gca().xaxis.set_major_formatter(mdates.DateFormatter('%m/%d/%Y'))

get all combination of n binary values

lst = map(list, itertools.product([0, 1], repeat=n))

how to check if all elements of a list matches a condition?

[x for x in items if x[2] == 0]

how to check if all values in the columns of a numpy matrix are the same?

a == a[(0), :]

is there a way to know if a list of elements is on a larger list without using 'in' keyword?

print(in_list([1, 2, 3], [1, 2, 4]))

converting timezone-aware datetime to local time in python

datetime.datetime.fromtimestamp(calendar.timegm(d.timetuple()))

equivalent of objects.latest() in app engine

MyObject.all().order('-time')[0]

pandas: selection with multiindex

df[pd.Series(df.index.get_level_values('A')).isin(vals[vals['values']].index)]

read a file from redirected stdin with python

result = sys.stdin.read()

how to change [1,2,3,4] to '1234' using python

"""""".join(map(str, [1, 2, 3, 4]))

add a new filter into sld

fts.Rules[1].create_filter('name_1', '>=', '0')

how to filter files (with known type) from os.walk?

files = [fi for fi in files if not fi.endswith('.dat')]

replace nan values in a pandas data frame with the average of columns

df.apply(lambda x: x.fillna(x.mean()), axis=0)

why does a python bytearray work with value >= 256

bytearray('\xff')

utf-16 codepoint counting in python

len(text.encode('utf-16-le')) // 2

delete character "m" from a string `s` using python

s = s.replace('M', '')

how to insert current_timestamp into postgres via python

cur.execute('INSERT INTO some_table (somecol) VALUES (%s)', (dt,))

python max function using 'key' and lambda expression

max(lis, key=lambda x: int(x))

how to get the number of <p> tags inside div in scrapy?

len(response.xpath('//div[@class="entry-content"]/p'))

confusing with the usage of regex in python

re.search('[a-z]*', '1234')

python finding index of maximum in list

max(enumerate(a), key=lambda x: x[1])[0]

regex match even number of letters

re.compile('(.)\\1')

store return value of a python script in a bash script

sys.exit(1)

convert `a` to string

str(a)

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))

how to check is a string is a valid regex - python?

re.compile('[')

how can i plot a mathematical expression of two variables in python?

plt.show()

how to urlencode a querystring in python?

urllib.parse.quote_plus('string_of_characters_like_these:$#@=?%^Q^$')

how to generate all permutations of a list in python

print(list(itertools.product([1, 2], repeat=3)))

in python, how to join a list of tuples into one list?

list(itertools.chain(*a))

how do i check if an insert was successful with mysqldb in python?

conn.commit()

django-rest-swagger: how to group endpoints?

url('^api/', include('api.tasks.urls'), name='my-api-root'),

flattening a list of numpy arrays?

out = np.concatenate(input_list).ravel().tolist()

subtract 1 hour and 10 minutes from time object `t`

(t - datetime.timedelta(hours=1, minutes=10))

reverse all x-axis points in pyplot

plt.gca().invert_xaxis()

reverse list `yourdata`

sorted(yourdata, reverse=True)

how to show pil image in ipython notebook

pil_im.show()

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

ax.xaxis.set_label_position('top')

find out how many times a regex matches in a string in python

len(re.findall(pattern, string_to_search))

python: lambda function in list comprehensions

[(lambda x: x * i) for i in range(4)]

remove dollar sign '$' from second to last column data in dataframe 'df' and convert the data into floats

df[df.columns[1:]].replace('[\\$,]', '', regex=True).astype(float)

how to generate random numbers that are different?

random.sample(range(1, 50), 6)

removing vowel characters 'aeiouaeiou' from string `text`

"""""".join(c for c in text if c not in 'aeiouAEIOU')

how to group dataframe by a period of time?

df.groupby(df.index.map(lambda t: t.minute))

how to convert the following string in python?

print('/'.join(new))

swap each pair of characters in string `s`

"""""".join([s[x:x + 2][::-1] for x in range(0, len(s), 2)])

how to get a max string length in nested lists

len(max(i, key=len))

how to append rows in a pandas dataframe in a for loop?

print('{}\n'.format(df))

print a emoji from a string `\\ud83d\\ude4f` having surrogate pairs

"""\\ud83d\\ude4f""".encode('utf-16', 'surrogatepass').decode('utf-16')