In [1]:

    

import collections


    

In [2]:

    

l_100 = list(range(100))


    

In [3]:

    

%%timeit
collections.Counter(l_100)


    

    




7.36 µs ± 205 ns per loop (mean ± std. dev. of 7 runs, 100000 loops each)

In [4]:

    

l_10000 = list(range(10000))


    

In [5]:

    

%%timeit
collections.Counter(l_10000)


    

    




435 µs ± 22.8 µs per loop (mean ± std. dev. of 7 runs, 1000 loops each)

In [6]:

    

l_10000_2 = list(range(100)) * 100
print(len(l_10000_2))


    

    




10000

In [7]:

    

%%timeit
collections.Counter(l_10000_2)


    

    




366 µs ± 3.86 µs per loop (mean ± std. dev. of 7 runs, 1000 loops each)