encrypt_shift_left_trans.py

def encrypt_shift_left_trans(decode_str):
    """encode the given string (a step down to next alphabest)
    a <- c
    b <- d
    ...
    k <- m
    o <- q
    e <- g
    ..
    z <- b
    """

    decode_str = decode_str.lower()
    trasn_from = "cdefghijklmnopqrstuvwxyzab"
    trasn_to = "abcdefghijklmnopqrstuvwxyz"
    table_string = decode_str.maketrans(trasn_from, trasn_to)
    return decode_str.translate(table_string)


print(encrypt_shift_left_trans("Hello Welcome to Python..!!"))
print(encrypt_shift_left_trans("I am Ramesh..."))
print(encrypt_shift_left_trans("You're reading in Medium"))
print(encrypt_shift_left_trans("Please subscribe to my stories"))