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AhmedSSoliman

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CoNaLa-Large

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adding a string to a list

b.append(c)

pandas: best way to select all columns starting with x

df.columns.map(lambda x: x.startswith('foo'))

how to clip polar plot in pylab/pyplot

plt.show()

is it possible to tune parameters with grid search for custom kernels in scikit-learn?

model.fit(X_train, y_train)

how to make a log log histogram in python

plt.show()

how do you get the current text contents of a qcombobox?

text = str(combobox1.currentText())

how to make python format floats with certain amount of significant digits?

"""{0:.6g}""".format(3.539)

is there a way to suppress printing that is done within a unit test?

unittest.main()

python: how to sort a list of dictionaries by several values?

sorted(A, key=itemgetter('name', 'age'))

in python, how to display current time in readable format

time.strftime('%l:%M%p %z on %b %d, %Y')

extract elements at indices (1, 2, 5) from a list `a`

[a[i] for i in (1, 2, 5)]

for loop in python

list(range(1, 11))

how to extract tuple values in pandas dataframe for use of matplotlib?

pd.pivot(index=df['B1'], columns=df.index, values=df['B2']).plot()

count the number of true values associated with key 'success' in dictionary `d`

sum(1 if d['success'] else 0 for d in s)

how do i read the first line of a string?

my_string.split('\n', 1)[0]

creating link to an url of flask app in jinja2 template

{{url_for('static', filename='[filenameofstaticfile]')}}

how do i set permissions (attributes) on a file in a zip file using python's zipfile module?

zipfile.writestr(zipinfo, '')

how to get a list of all integer points in an n-dimensional cube using python?

list(itertools.product(list(range(-x, y)), repeat=dim))

how do i modify a single character in a string, in python?

print(''.join(a))

convert binary string '01010101111' to integer

int('01010101111', 2)

a list as a key for pyspark's reducebykey

rdd.map(lambda k_v: (set(k_v[0]), k_v[1])).groupByKey().collect()

python - differences between elements of a list

[(j - i) for i, j in zip(t[:-1], t[1:])]

rearrange tuple of tuples in python

tuple(zip(*t))

taking the results of a bash command and using it in python

os.system('top -d 30 | grep %d > test.txt' % pid)

how to unpack a dictionary of list (of dictionaries!) and return as grouped tuples?

[('A', 1, 2), ('B', 3, 4)]

how do i print the content of a .txt file in python?

f.close()

remove a specific column in numpy

np.delete(a, [1, 3], axis=1)

django-piston: how can i get app_label + model_name?

instance.__class__.__name__

histogram in matplotlib, time on x-axis

ax.xaxis.set_major_formatter(mdates.DateFormatter('%d.%m.%y'))

setting path to firefox binary on windows with selenium webdriver

driver = webdriver.Firefox()

pandas remove column by index

df = df.ix[:, 0:2]

rename index of a pandas dataframe

df.ix['c', '3']

django - filter queryset by charfield value length

MyModel.objects.filter(text__regex='^.{254}.*')

get keys and items of dictionary `d` as a list

list(d.items())

how to get every element in a list of list of lists?

[a for c in Cards for b in c for a in b]

extracting a region from an image using slicing in python, opencv

cv2.cvtColor(img, cv2.COLOR_BGR2RGB)

how to save pandas pie plot to a file

fig.savefig('~/Desktop/myplot.pdf')

convert a list of strings to either int or float

[(float(i) if '.' in i else int(i)) for i in s]

remove a level from a pandas multiindex

MultiIndex.from_tuples(index_3levels.droplevel('l3').unique())

python: how do i use itertools?

list(itertools.product(list(range(2)), repeat=3))

is there a way to split a string by every nth separator in python?

print(['-'.join(words[i:i + span]) for i in range(0, len(words), span)])

pandas subtract a row from dataframe `df2` from dataframe `df`

pd.DataFrame(df.values - df2.values, columns=df.columns)

how can i get dict from sqlite query?

cur.execute('select 1 as a')

correct code to remove the vowels from a string in python

"""""".join([l for l in c if l not in vowels])

compare two columns using pandas

df2 = df.astype(float)

how to create matplotlib colormap that treats one value specially?

plt.show()

get last day of the first month in year 2000

(datetime.date(2000, 2, 1) - datetime.timedelta(days=1))

combining rows in pandas

df.reset_index().groupby('city_id').sum()

pandas + dataframe - select by partial string

df[df['A'].str.contains('hello')]

how to get full path of current file's directory in python?

os.path.dirname(os.path.abspath(__file__))

additional empty elements when splitting a string with re.split

re.findall('\\w+=".*?"', comp)

how do you select choices in a form using python?

form['favorite_cheese'] = ['brie']

get a list of all the duplicate items in dataframe `df` using pandas

pd.concat(g for _, g in df.groupby('ID') if len(g) > 1)

how to get files in a directory, including all subdirectories

print(os.path.join(dirpath, filename))

fastest way to count number of occurrences in a python list

Counter({'1': 6, '2': 4, '7': 3, '10': 2})

python : how to remove duplicate lists in a list of list?

b.sort(key=lambda x: a.index(x))

lambda in python

f = lambda x, y: x + y

technique to remove common words(and their plural versions) from a string

'all', 'just', 'being', 'over', 'both', 'through', 'yourselves', 'its', 'before', 'herself', 'had', 'should', 'to', 'only', 'under', 'ours', 'has', 'do', 'them', 'his', 'very', 'they', 'not', 'during', 'now', 'him', 'nor', 'did', 'this', 'she', 'each', 'further', 'where', 'few', 'because', 'doing', 'some', 'are', 'our', 'ourselves', 'out', 'what', 'for', 'while', 'does', 'above', 'between', 't', 'be', 'we', 'who', 'were', 'here', 'hers', 'by', 'on', 'about', 'of', 'against', 's', 'or', 'own', 'into', 'yourself', 'down', 'your', 'from', 'her', 'their', 'there', 'been', 'whom', 'too', 'themselves', 'was', 'until', 'more', 'himself', 'that', 'but', 'don', 'with', 'than', 'those', 'he', 'me', 'myself', 'these', 'up', 'will', 'below', 'can', 'theirs', 'my', 'and', 'then', 'is', 'am', 'it', 'an', 'as', 'itself', 'at', 'have', 'in', 'any', 'if', 'again', 'no', 'when', 'same', 'how', 'other', 'which', 'you', 'after', 'most', 'such', 'why', 'a', 'off', 'i', 'yours', 'so', 'the', 'having', 'once'

heap sort: how to sort?

sort()

how to write unicode strings into a file?

f.write(s)

create a regular expression object with a pattern that will match nothing

re.compile('a^')

how can i order a list of connections

[4, 6, 5, 3, 7, 8], [1, 2]

plotting within a for loop, with 'hold on' effect in matplotlib?

plt.show()

create new column `a_perc` in dataframe `df` with row values equal to the value in column `a` divided by the value in column `sum`

df['A_perc'] = df['A'] / df['sum']

creating an empty list

list()

converting from a string to boolean in python?

str2bool('1')

how to iterate over time periods in pandas

s.resample('3M', how='sum')

appending to dict of lists adds value to every key

d = {k: [] for k in keys}

python convert list to dictionary

l = [['a', 'b'], ['c', 'd'], ['e']]

display maximum output data of columns in dataframe `pandas` that will fit into the screen

pandas.set_option('display.max_columns', None)

insert element in python list after every nth element

['a', 'b', 'c', 'x', 'd', 'e', 'f', 'x', 'g', 'h', 'i', 'x', 'j']

sorting a list of dictionary values by date in python

list.sort(key=lambda item: item['date'], reverse=True)

python pandas - how to flatten a hierarchical index in columns

pd.DataFrame(df.to_records())

how to plot a wav file

plt.show()

how to multiply all integers inside list

l = list(map(lambda x: 2 * x, l))

reverse a string `a_string`

def reversed_string(a_string): return a_string[::(-1)]

how to add a new div tag in an existing html file after a h1 tag using python

htmlFile = open('path to html file').read()

split a list `l` into evenly sized chunks `n`

[l[i:i + n] for i in range(0, len(l), n)]

get the first element of each tuple in a list `rows`

[x[0] for x in rows]

what is the best way to sort list with custom sorting parameters in python?

li1.sort(key=lambda x: not x.startswith('b.'))

drawing a huge graph with networkx and matplotlib

plt.savefig('graph.pdf')

print 'here is your checkmark: ' plus unicode character u'\u2713'

print('here is your checkmark: ' + '\u2713')

list manipulation in python

var1, var2, var3 = (ll + [None] * 3)[:3]

php to python pack('h')

binascii.hexlify('Dummy String')

how to use applymap, lambda and dataframe together to filter / modify dataframe in python?

df.fillna('o')

specifying and saving a figure with exact size in pixels

plt.savefig('myfig.png', dpi=1000)

convert column of date objects in pandas dataframe to strings

df['A'].apply(lambda x: x.strftime('%d%m%Y'))

how to use ax.get_ylim() in matplotlib

ax.axhline(1, color='black', lw=2)

how do you check if a string contains only numbers - python

str.isdigit()

adding calculated column(s) to a dataframe in pandas

d['A'][1:] < d['C'][:-1]

most pythonic way to print *at most* some number of decimal places

format(f, '.2f').rstrip('0').rstrip('.')

indexerror when trying to read_table with pandas

len(['DATE', 'TIME', 'DLAT', 'DLON', 'SLAT', 'SLON', 'SHGT', 'HGT', 'N', 'E'])

slicing a multidimensional list

[x[0] for x in listD[2]]

get a list of booleans `z` that shows wether the corresponding items in list `x` and `y` are equal

z = [(i == j) for i, j in zip(x, y)]

how to give a pandas/matplotlib bar graph custom colors

df.plot(kind='bar', stacked=True, color=my_colors)

changing line properties in matplotlib pie chart

plt.rcParams['line.color'] = 'white'

how to swap a group of column headings with their values in pandas

df = df.assign(a5=['Foo', 'Bar', 'Baz'])

convert scientific notation to decimal - python

print('Number is: %.8f' % float(a[0] / a[1]))

adding new key inside a new key and assigning value in python dictionary

dic['Test'].update({'class': {'section': 5}})

how to get every single permutation of a string?

print([''.join(p) for i in range(1, len(s) + 1) for p in permutations(s, i)])