caesar_en.py

def encrypt(text, s):
    result = ""
    # traverse text
    for i in range(len(text)):
        char = text[i]
        if char.isupper():
            # Encrypt uppercase characters
            result += chr((ord(char) + s - 65) % 26 + 65)
        else:
            # Encrypt lowercase characters
            result += chr((ord(char) + s - 97) % 26 + 97)
    return result


def decrypt(text, s):
    result = ""
    # traverse text
    for i in range(len(text)):
        char = text[i]
        if char.isupper():
            # Decrypt uppercase characters
            result += chr((ord(char) - s - 65) % 26 + 65)
        else:
            # Decrypt lowercase characters
            result += chr((ord(char) - s - 97) % 26 + 97)
    return result


while True:
    print()
    t = input(
        """Enter e for encrypting a text using Caesar Cipher Encryption
Enter d for decrypting a text using Caesar Cipher Encryption method
Enter any other key for exit"""
    )
    if t == "e":
        text = input("Enter the text for Encrypting: ")
        shift = int(input("Enter the value of shift: "))
        print("After Encryption the text is " + encrypt(text, shift))
        print("\n")
    elif t == "d":
        text = input("Enter the text for Decrypting: ")
        shift = int(input("Enter the value of shift: "))
        print("After Decryption the text is " + decrypt(text, shift))
        print("\n")
    else:
        print("Application is aborted.")
        break

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