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Python – Element frequencies in percent range

  • Last Updated : 10 Sep, 2021

Given a list of elements, and percent ranges, the task is to write a python program to extract all the elements whose frequency is present in a given range. 

Input : test_list = [4, 6, 2, 4, 6, 7, 8, 4, 9, 1, 4, 6, 7, 8], strt, end = 13, 25

Output : [6, 7, 8]

Explanation : 21.4, 14.2, 14.2 is percentage presence of 6, 7, 8 respectively.

Input : test_list = [4, 6, 2, 4, 6, 7, 8, 4, 9, 1, 4, 6, 7, 8], strt, end = 13, 20

Output : [7, 8]

Explanation : 14.2, 14.2 is percentage presence of 7, 8 respectively.

Presence percentage can be simply computed by the below formula:

Frequency of the element present in the list/ total no. of elements in the list

Method #1 : Using Counter() + set() + loop + len()

In this, frequencies of all the elements are extracted using loop. Next step is to get the set of elements of list and check if frequencies are between range specified.

Python3




# Python3 code to demonstrate working of
# Element frequencies in percent range
# Using Counter() + set() + loop + len()
from collections import Counter
 
# initializing list
test_list = [4, 6, 2, 4, 6, 7, 8, 4, 9, 1, 4, 6, 7, 8]
 
# printing original list
print("The original list is : " + str(test_list))
 
# initializing percent ranges
strt, end = 13, 25
 
# getting frequencies
freqs = dict(Counter(test_list))
 
# computing percents and assigning
res = []
for ele in set(test_list):
    percent = (freqs[ele] / len(test_list)) * 100
    if percent >= strt and percent <= end:
        res.append(ele)
 
# printing result
print("Elements within range of frequencies : " + str(res))

Output:

The original list is : [4, 6, 2, 4, 6, 7, 8, 4, 9, 1, 4, 6, 7, 8]
Elements within range of frequencies : [6, 7, 8]

Method #2 : Using Counter() + loop + len()
This performs tasks in an almost similar manner, the key difference being the Counter keys are iterated rather than the list elements, as they’d provide similar output. 

Python3




# Python3 code to demonstrate working of
# Element frequencies in percent range
# Using Counter() + loop + len()
from collections import Counter
 
# initializing list
test_list = [4, 6, 2, 4, 6, 7, 8, 4, 9, 1, 4, 6, 7, 8]
 
# printing original list
print("The original list is : " + str(test_list))
 
# initializing percent ranges
strt, end = 13, 25
 
# getting frequencies
freqs = dict(Counter(test_list))
 
# computing percents and assigning
# iterating from dictionary
res = []
for ele in freqs:
    percent = (freqs[ele] / len(test_list)) * 100
    if percent >= strt and percent <= end:
        res.append(ele)
 
# printing result
print("Elements within range of frequencies : " + str(res))

Output:

The original list is : [4, 6, 2, 4, 6, 7, 8, 4, 9, 1, 4, 6, 7, 8]
Elements within range of frequencies : [6, 7, 8]

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