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)
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)
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
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.
Find the most occurring character and its count
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