frequency

frequency.py

from collections import Counter
from collections import defaultdict


def frequency1(lst):
    return [(lst.count(s), s) for s in set(lst)]

def frequency2(lst):
    return dict((s, lst.count(s)) 
                for s in set(lst))   
                                          
def frequency3(lst):
    d = defaultdict(int)
    for s in lst:
        d[s] += 1
    return d 

def frequency4(lst):
    return Counter(lst)