In [1]:

    

import collections


    

In [2]:

    

l = ['a', 'a', 'a', 'a', 'b', 'c', 'c']
c = collections.Counter(l)


    

In [3]:

    

print(c)


    

    




Counter({'a': 4, 'c': 2, 'b': 1})

In [4]:

    

print(type(c))


    

    




<class 'collections.Counter'>

In [5]:

    

print(issubclass(type(c), dict))


    

    




True

In [6]:

    

print(c['a'])


    

    




4

In [7]:

    

print(c['b'])


    

    




1

In [8]:

    

print(c['c'])


    

    




2

In [9]:

    

print(c['d'])


    

    




0

In [10]:

    

print(c.keys())


    

    




dict_keys(['a', 'b', 'c'])

In [11]:

    

print(c.values())


    

    




dict_values([4, 1, 2])

In [12]:

    

print(c.items())


    

    




dict_items([('a', 4), ('b', 1), ('c', 2)])

In [13]:

    

print(c.most_common())


    

    




[('a', 4), ('c', 2), ('b', 1)]

In [14]:

    

print(c.most_common()[0])


    

    




('a', 4)

In [15]:

    

print(c.most_common()[-1])


    

    




('b', 1)

In [16]:

    

print(c.most_common()[0][0])


    

    




a

In [17]:

    

print(c.most_common()[0][1])


    

    




4

In [18]:

    

print(c.most_common()[::-1])


    

    




[('b', 1), ('c', 2), ('a', 4)]

In [19]:

    

print(c.most_common(2))


    

    




[('a', 4), ('c', 2)]

In [20]:

    

values, counts = zip(*c.most_common())


    

In [21]:

    

print(values)


    

    




('a', 'c', 'b')

In [22]:

    

print(counts)


    

    




(4, 2, 1)

In [23]:

    

l = ['a', 'a', 'a', 'a', 'b', 'c', 'c']
c = collections.Counter(l)


    

In [24]:

    

print(len(c))


    

    




3

In [25]:

    

print(set(l))


    

    




{'b', 'a', 'c'}

In [26]:

    

print(len(set(l)))


    

    




3

In [27]:

    

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


    

In [28]:

    

print([i for i in l if l.count(i) >= 2])


    

    




['a', 'a', 'a', 'a', 'c', 'c']

In [29]:

    

print(len([i for i in l if l.count(i) >= 2]))


    

    




6

In [30]:

    

c = collections.Counter(l)


    

In [31]:

    

print([i[0] for i in c.items() if i[1] >= 2])


    

    




['a', 'c']

In [32]:

    

print(len([i[0] for i in c.items() if i[1] >= 2]))


    

    




2

In [33]:

    

s = 'government of the people, by the people, for the people.'


    

In [34]:

    

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

print(s_remove)


    

    




government of the people by the people for the people

In [35]:

    

word_list = s_remove.split()

print(word_list)


    

    




['government', 'of', 'the', 'people', 'by', 'the', 'people', 'for', 'the', 'people']

In [36]:

    

print(word_list.count('people'))


    

    




3

In [37]:

    

print(len(set(word_list)))


    

    




6

In [38]:

    

c = collections.Counter(word_list)


    

In [39]:

    

print(c)


    

    




Counter({'the': 3, 'people': 3, 'government': 1, 'of': 1, 'by': 1, 'for': 1})

In [40]:

    

print(c.most_common()[0][0])


    

    




the

In [41]:

    

s = 'supercalifragilisticexpialidocious'


    

In [42]:

    

print(s.count('p'))


    

    




2

In [43]:

    

c = collections.Counter(s)


    

In [44]:

    

print(c)


    

    




Counter({'i': 7, 's': 3, 'c': 3, 'a': 3, 'l': 3, 'u': 2, 'p': 2, 'e': 2, 'r': 2, 'o': 2, 'f': 1, 'g': 1, 't': 1, 'x': 1, 'd': 1})

In [45]:

    

print(c.most_common(5))


    

    




[('i', 7), ('s', 3), ('c', 3), ('a', 3), ('l', 3)]

In [46]:

    

values, counts = zip(*c.most_common(5))

print(values)


    

    




('i', 's', 'c', 'a', 'l')