Python program to count characters of string

In this post, we write a python program to count characters of a string with proper explanation.

We are writing this python program in four different ways:

1. Simple way (by taking user input)
2. Using function
3. Using a python dictionary
4. Using python dictionary comprehension

So let’s write a program to count characters of the string in all 4 ways one by one.

A simple way (by taking user input)

This program may ask like:

Write a python program to count characters of string by taking user input.

But before writing this program you should know about:

1. How to take user input in python
2. If-else
3. for loop
4. .count() method (count is built-in function in python)

Source code

My_string = input('ENter your string: ')

check_empty = '' 
for i in My_string:
    if i not in check_empty: # this help you to count unique characters of the string
        check_empty += i
        string_count = My_string.count(i) # count a character 
        print(f'{i}: {string_count}') 

Output

ENter your string: Ssaurabh
S: 1
s: 1
a: 2
u: 1
r: 1
b: 1
h: 1

Using function

This program may ask like:

Write a python program to count characters of string by using a user-defined function.

But before writing this program you should know about:

1. how to take user input
2. If-else
3. for loop
4. .count() method
5. Python function

Source code

def count_string(my_string): #define a function
    check_present = ''
    for character  in my_string:
        if character not in check_present: #avoid to count a character more than once 
            check_present+=character
            character_count = my_string.count(character) #count a character
            print(f'{character}: {character_count}') 

my_input = input('ENter your string: ')
count_string(my_input)

Output

 ENter your string: hiiiiiiinaaaaaa
h: 1
i: 7
n: 1
a: 6

Using python Dictionary

This program may ask like:

Write a python program to count characters of strings using Dictionary.

But before writing this program you should know about:

1. how to take user input
2. for loop
3. .count() method
4. python Dictionary

Source code

word = input('ENter your word for count: ')
d = {} #empty dictionary
for i in word:
    d[i] = word.count(i) #count and add to dictionary
print(d)

Output

ENter your word for count: roose
{'r': 1, 'o': 2, 's': 1, 'e': 1}

Using python dictionary comprehension

this program may ask like:

Count characters of string using dictionary comprehension in python.

But before writing this program you should know about Dictionary comprehension.

Source code

my_string = input('ENter your world: ')
counting = {i : my_string.count(i) for i in my_string}
print(counting)

Output

ENter your world: jennifer
{'j': 1, 'e': 2, 'n': 2, 'i': 1, 'f': 1, 'r': 1}

Hope this post adds some value to your life – thank you.