Python program to count the number of characters in a String

Python program to find the most occurring character and its count

Last Updated : 15 Mar, 2023

Given a string, write a python program to find the most occurrence character and its number of occurrences. Examples:

Input : hello
Output : ('l', 2)

Input : geeksforgeeks
Output : ('e', 4)

We can solve this problem quickly in python using Counter() method. Simple Approach is to 1) Create a dictionary using Counter method having strings as keys and their frequencies as values. 2) Find the maximum occurrence of a character i.e. value and get the index of it.

Python

# Python program to find the most occurring
# character and its count
from collections import Counter
 
def find_most_occ_char(input):
 
    # now create dictionary using counter method
    # which will have strings as key and their 
    # frequencies as value
    wc = Counter(input)
 
    # Finding maximum occurrence of a character 
        # and get the index of it.
    s = max(wc.values())
    i = wc.values().index(s)
     
    print wc.items()[i]
 
# Driver program
if __name__ == "__main__":
    input = 'geeksforgeeks'
    find_most_occ_char(input)

Output:

('e', 4)

Time Complexity: O(N) where N is the length of the input string
Auxiliary Space: O(1)

One more approach to find the most occurring character and its count in python3

Python3

# python code to find most occurring character in a string and its count
string1="geeksforgeeks"
list1=[]
list2=[]
for i in string1:
  if i not in list1:
    list1.append(i)#appending unique characters of string
    list2.append(string1.count(i))
#finding maximum in the list
occ=max(list2)
ele=list1[list2.index(occ)]
print(ele,occ)
    

Output

e 4

Time Complexity: O(N)
Auxiliary Space: O(N)

Approach : Using operator.countOf() and index() methods

Python3

# python code to find most occurring character in a string and its count
string1="geeksforgeeks"
list1=[]
list2=[]
for i in string1:
  if i not in list1:
    list1.append(i)#appending unique characters of string
    import operator
    list2.append(operator.countOf(string1,i))
#finding maximum in the list
occ=max(list2)
ele=list1[list2.index(occ)]
print(ele,occ)

Output

e 4

Time Complexity: O(N)
Auxiliary Space: O(N)

Approach: Using lambda function

This new approach uses a lambda function to count the occurrences of each character in the string, and then creates a list of tuples containing the character and its count. Finally, it finds the tuple with the maximum count and prints its character and counts.

Python3

# python code to find most occurring character in a string and its count
string1 = "geeksforgeeks"
 
# use a lambda function to count occurrences of each character in the string
count_char = lambda c: string1.count(c)
 
# create a list of tuples containing the character and its count
char_counts = [(c, count_char(c)) for c in set(string1)]
 
# find the tuple with the maximum count and print its character and count
most_common = max(char_counts, key=lambda x: x[1])
print(most_common[0], most_common[1])
 
# Contributed by adityasha4x71

Output

e 4

Time Complexity: O(N*N), due to count() function used in the lambda

Auxiliary Space: O(N), for creating a list of tuples containing the character and its count.

Python program to count the number of characters in a String

A

AFZAL ANSARI

News

Improve

Article Tags :

Similar Reads

Python program to find the most occurring character and its count

Given a string, write a python program to find the most occurrence character and its number of occurrences. Examples: Input : hello Output : ('l', 2) Input : geeksforgeeks Output : ('e', 4) We can solve this problem quickly in python using Counter() method. Simple Approach is to 1) Create a dictiona

Python program to count the number of characters in a String

In this article, we will see the program to count the number of characters in a String. In Python, the len() function is used to determine the length of an object. Example: [GFGTABS] Python s = "Geeks for Geeks!" # Count the characters using len() function count = len(s) print(count) [/GFG

Python Program to Count Vowels, Lines, Characters in Text File

In this article, we are going to create a python program that counts vowels, lines, and a number of characters present in a particular text file. ApproachWe have to open the file using open() function in python.Then make three variables, vowel, line and character to count the number of vowels, lines

Python program to count upper and lower case characters without using inbuilt functions

Given a string that contains both upper and lower case characters in it. The task is to count a number of upper and lower case characters in it. Examples :Input : Introduction to Python Output : Lower Case characters : 18 Upper case characters : 2 Input : Welcome to GeeksforGeeks Output : Lower Case

Python program to calculate the number of digits and letters in a string

In this article, we will check various methods to calculate the number of digits and letters in a string. Using a for loop to remove empty strings from a list involves iterating through the list, checking if each string is not empty, and adding it to a new list. [GFGTABS] Python s = "Hello123!

Python program to equal character frequencies

Given a String, ensure it has equal character frequencies, if not, equate by adding required characters. Input : test_str = 'geeksforgeeks' Output : geeksforgeeksggkkssfffooorrr Explanation : Maximum characters are 4 of 'e'. Other character are appended of frequency 4 - (count of chars). Input : tes

Python program to Count the Number of occurrences of a key-value pair in a text file

Given a text file of key-value pairs. The task is to count the number of occurrences of the key-value pairs in the file with Python Program to Count the occurrences of a key-value pairNaive Approach to Count the Occurrences of a key-value PairUsing Python built-in collections.CounterUsing regular ex

Python - Characters occurring in multiple Strings

Sometimes, while working with Python strings, we can have problem in which we need to extract the characters which have occurrences in more than one string in string list. This kind of problem usually occurs in web development and Data Science domains. Lets discuss certain ways in which this task ca

Python | Finding 'n' Character Words in a Text File

This article aims to find words with a certain number of characters. In the code mentioned below, a Python program is given to find the words containing three characters in the text file. Example Input: Hello, how are you ? , n=3 Output: how are you Explanation: Output contains every character of th

Python program to calculate the number of words and characters in the string

We are given a string we need to find the total number of words and total number of character in the given string. For Example we are given a string s = "Geeksforgeeks is best Computer Science Portal" we need to count the total words in the given string and the total characters in the given string.