9.1_std_lib_collection

from collections import Counter as cr

x = [1, 5, 'a', 'b', 'c', 1, 'b', 'a', 'c', 'c', 1, 1, 1]
words = cr(x)  # which element how much time

#--------------------------------

c = cr()   # intialize counter
c.update('xyzzzzxy')  # update c

#--------------------------------

c1 = cr('abcdaab')
for l in 'abcde':
    print('{} : {} '.format(l, c1[l]), end=' ')

print('\n')
# element:
# -------------

c2 = cr('extreme')
c2['z'] = 0
# print(c2)
# print(list(c2.elements()))  # only key elements


# get most common
#---------------------

print('\n')
dummyList = [1, 11, 1, 2, 4, 8, 'a', 'x', 'w',
             5, 9, 'o', 'o', 10, 11, 11, 1, 1]
c3 = cr()
c3.update(dummyList)
print(c3.most_common(3))   # most common words