In this post, We will be going to see different ways to write a code in Python for counting number of letters in a word

Example:

Input: Word = "BioChemiThon"
Output:
B -> 1
i -> 2
o -> 2
C -> 1
h -> 2
e -> 1
m -> 1
T -> 1
n -> 1

Now, Let’s see the Codes:

Code 1: Using the concept of Dictionary.

# Given Word
word = "BioChemiThon"

# Take an empty dictionary
dictionary = {}

# loop through every letters of word
for character in word:
    
    # check for letter is already
    # present in a dictionary or not
    
    # if present then increment count by 1
    if character in dictionary:
        dictionary[character] += 1
    
    # otherwise assign 1 to it
    else:
        dictionary[character] = 1

print("Given Word:", word)
print("Count of each letters is:")

# print letter and its count together
for character, count in dictionary.items() :
    print(character,"->",count)

Output:

Given Word: BioChemiThon
Count of number of each letters is:
B -> 1
i -> 2
o -> 2
C -> 1
h -> 2
e -> 1
m -> 1
T -> 1
n -> 1

Code 2: Using the concept of Set and Dictionary.

# Given Word
word = "BioChemiThon"

# Set of characters of given word
character_set = set(word)

# Take an empty dictionary
dictionary = {}

# loop through every characters 
# of a character set
for character in character_set:
    
    # Count of character in a word
    dictionary[character] = word.count(character)
    

print("Given Word:", word)
print("Count of each letters is:")

# Print letter and its count together
for character in dictionary :
    print(character, "->", dictionary[character])

Output:

Given Word: BioChemiThon
Count of each letters is:
T -> 1
n -> 1
m -> 1
B -> 1
i -> 2
e -> 1
h -> 2
C -> 1
o -> 2

Code 3: Using the concept of list-comprehension.

# Given Word
word = "BioChemiThon"

# Set of characters of given word
character_set = set(word)

# list-comprehension
# list of tuples created
character_count_list = [ (char, word.count(char)) for char in character_set]

print("Given Word:", word)
print("Count of each letters is:")

# Print letter and its count together
for char_count in character_count_list :
    print(char_count[0], "->", char_count[1])

Output:

Given Word: BioChemiThon
Count of each letters is:
T -> 1
n -> 1
m -> 1
B -> 1
i -> 2
e -> 1
h -> 2
C -> 1
o -> 2

Code 4: Using the concept of Counter class.

# from collections library import Counter 
# to this program
from collections import Counter

# Given Word
word = "BioChemiThon"

# Counter class will return counter object
# contains key, value 
char_count_obj = Counter(word)

print(type(char_count_obj))
print(char_count_obj)

print("\nGiven Word:", word)
print("Count of each letters is:")

# Print letter and its count together
for char in char_count_obj:
    print(char, "->", char_count_obj[char])

Output:

Counter({'i': 2, 'o': 2, 'h': 2, 'B': 1, 'C': 1, 'e': 1, 'm': 1, 'T': 1, 'n': 1})

Given Word: BioChemiThon
Count of each letters is:
B -> 1
i -> 2
o -> 2
C -> 1
h -> 2
e -> 1
m -> 1
T -> 1
n -> 1