Check whether a character is an alphabet or not in Python

Understanding Alphabets

An alphabet is any letter from A to Z (both uppercase and lowercase). Any other character is not considered an alphabet.

We will explore three different methods to check whether a character is an alphabet or not in Python.

Method 1: Using if-else

This method checks if the character falls within the range of alphabets.

ch = input("Enter a character: ")
if ('a' <= ch <= 'z') or ('A' <= ch <= 'Z'):
    print(f"{ch} is an alphabet")
else:
    print(f"{ch} is not an alphabet")
            

Method 2: Using ASCII Values

This method checks the ASCII values of the character.

ch = input("Enter a character: ")
if (65 <= ord(ch) <= 90) or (97 <= ord(ch) <= 122):
    print(f"{ch} is an alphabet")
else:
    print(f"{ch} is not an alphabet")
            

Method 3: Using a Function

This method defines a function to check if a character is an alphabet.

def is_alphabet(ch):
    return ('a' <= ch <= 'z') or ('A' <= ch <= 'Z')

def check_alphabet(ch):
    if is_alphabet(ch):
        print(f"{ch} is an alphabet")
    else:
        print(f"{ch} is not an alphabet")

ch = input("Enter a character: ")
check_alphabet(ch)