frequency of element in list python code example

Example 1: list count frequency python

import collections
a = [1,1,1,1,2,2,2,2,3,3,4,5,5]
counter=collections.Counter(a)
print(counter)
# Counter({1: 4, 2: 4, 3: 2, 5: 2, 4: 1})
print(counter.values())
# [4, 4, 2, 1, 2]
print(counter.keys())
# [1, 2, 3, 4, 5]
print(counter.most_common(3))
# [(1, 4), (2, 4), (3, 2)]

Example 2: how to get frequency of each elements in a python list

# easiest way to count the frequency of all elements in a list
lst = ['Sam', 'Sam', 'Tim', 'Tim', 'Tim', 'r', 'l']

freq = {} # stores the frequency of elements
counting = [freq.update({x: lst.count(x)}) for x in lst]

# output of freq 
{'Sam': 2, 'Tim': 3, 'r': 1, 'l': 1}

#credit: buggyprogrammer.com
#Note: if you print "counting" it will return a list full of None so ignore it.

Example 3: freq count in python

freq = {} 
    for item in my_list: 
        if (item in freq): 
            freq[item] += 1
        else: 
            freq[item] = 1

Example 4: find frequency of numbers in list python

from collections import Counter

def frequency_table(n):
    table = Counter(n)
    print('Number\tFrequency')
    for number in table.most_common() :
        print('{0}\t{1}'.format(number[0], number[1]))
        
# src : Doing Math With Python