Python/Pandas Some Tricks

Find empty index of a Series of list

df[df.str.len()==0].index

Return the longest string of each element

df.apply(lambda x:max(x, key=len))

Sort a dict

import operatorx = {1: 2, 3: 4, 4: 3, 2: 1, 0: 0}#sort by valuesorted_x = sorted(x.items(), key=operator.itemgetter(1))#sort by keysorted_x = sorted(x.items(), key=operator.itemgetter(0))

Sort a list of tuples

import operatorx = [(1,2), (3,4), (4,3), (2,1), (0,0)]sorted_x = sorted(x, key=operator.itemgetter(1))

Longest word in a list

max(lst, key=len)

List zip

list(zip(lstA, lstB))#out:[(lstA1, lstB1),      (lstA2, lstB2),      ....]

Map target into binary values

spam_data['target'] = np.where(spam_data['target']=='spam',1,0)

Sort the array and return the original index

arr.argsort()

see a Seaborn style

import seaborn as snssns.axes_style('white')

change the default style

stl_white1 = sns.axes_style('white', {'axes.labelcolor':'b', 'axes.linewidth': 0.5, 'xtick.major.size':3, 'ytick.major.size':3})sns.set(style=stl_white1,font='Comfortaa', font_scale=1.5)

font names

import matplotlib as mplfont_paths = mpl.font_manager.findSystemFonts()font_objects = mpl.font_manager.createFontList(font_paths)font_names = [f.name for f in font_objects]print (font_names)