Caesar Cipher Implementation in Python.py

# Caesar Cipher Implementation in Python
# Menu Initialization
print("Caesar Cipher Program")
print("Encrypt - 1")
print("Decrypt - 2")

# input from user
choice = int(input("Enter your choice of action: "))
if choice == 1:
    text = input("Enter text to be encrypted: ")
    shift = input("Enter shift for encryption (or leave blank) : ")
else:
    text = input("Enter text to be decrypted: ")
    shift = input("Enter shift for decryption (or leave blank) : ")

# Default value of Shifter
if shift == "":
    shift = 13

# Initialization of resultant string
result = ""

# Conditional & Iterational Statements
for i in text:
    if i.isalpha(): # Segregation of alphabets & other characters
        if i.isupper(): # Segregation of upper & lowercase alphabets
            base = ord("A")
        else:
            base = ord("a")
        result += chr((ord(i) - base + shift) % 26 + base)
    else:
        result += i

# Output to user
if choice == 1:
    print(f"Encrypted Text : {result}")
else:
    print(f"Decrypted Text : {result}")

# End