Python – Fractional Frequency of elements in List

Given a List, get fractional frequency of each element at each position.

Input : test_list = [4, 5, 4, 6, 7, 5, 4, 5, 4]
Output : [‘1/4’, ‘1/3’, ‘2/4’, ‘1/1’, ‘1/1’, ‘2/3’, ‘3/4’, ‘3/3’, ‘4/4’]
Explanation : 4 occurs 1/4th of total occurrences till 1st index, and so on.

Input : test_list = [4, 5, 4, 6, 7, 5]
Output : [‘1/2’, ‘1/2’, ‘2/2’, ‘1/1’, ‘1/1’, ‘2/2’]
Explanation : 4 occurs 1/2th of total occurrences till 1st index, and so on.

Method : Using Counter() + loop + dictionary comprehension

In this, we use Counter() to get the frequency of each element in list and to form denominator part of fraction. Numerator is initialized to 0 for each element. Then loop is used to add the elements in numberator and join with total frequency in denominator.

Python3

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# Python3 code to demonstrate working of 
# Fractional Frequency of elements in List
# Using Counter() + loop + dictionary comprehension
from collections import Counter
  
# initializing list
test_list = [4, 5, 4, 6, 7, 5, 4, 5, 4, 6, 4, 6]
  
# printing original list
print("The original list is : " + str(test_list))
  
# initializing numerator
numer = {idx : 0 for idx in set(test_list)}
  
# initializing denominator
denom = Counter(test_list)
  
res = []
for ele in test_list:
      
    # increasing counter 
    numer[ele] += 1
    res.append(str(numer[ele]) + '/' + str(denom[ele]))
  
# printing result 
print("Fractional Frequency List : " + str(res))

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Output

The original list is : [4, 5, 4, 6, 7, 5, 4, 5, 4, 6, 4, 6]
Fractional Frequency List : ['1/5', '1/3', '2/5', '1/3', '1/1', '2/3', '3/5', '3/3', '4/5', '2/3', '5/5', '3/3']

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