Python – Specific Characters Frequency in String List

Given String list, extract frequency of specific characters in whole strings list.

Input : test_list = [“geeksforgeeks is best for geeks”], chr_list = [‘e’, ‘b’, ‘g’, ‘f’]
Output : {‘g’: 3, ‘e’: 7, ‘b’: 1, ‘f’ : 1}
Explanation : Frequency of certain characters extracted.

Input : test_list = [“geeksforgeeks], chr_list = [‘e’, ‘g’]
Output : {‘g’: 2, ‘e’: 4}
Explanation : Frequency of certain characters extracted.

Method #1 : Using join() + Counter()

In this, we concatenate all the strings, and then Counter() performs task of getting all frequencies. Last step is to get only specific characters from List in dictionary using dictionary comprehension.

The original list : ['geeksforgeeks is best for geeks']
Specific Characters Frequencies : {'g': 3, 'e': 7, 'b': 1}

Method #2 : Using chain.from_iterable() + Counter() + dictionary comprehension

In this, task of concatenation is done using chain.from_iterable() rather than join(). Rest all tasks are done as above method.

The original list : ['geeksforgeeks is best for geeks']
Specific Characters Frequencies : {'g': 3, 'e': 7, 'b': 1}