pl4a.py

#!/usr/bin/env python3

# Pielang
# Public domain

import sys, traceback
import re

def chop(thestring, ending):
  if thestring.startswith(ending):
    return thestring[len(ending):]
  return thestring

def rchop(thestring, ending):
  if thestring.endswith(ending):
    return thestring[:-len(ending)]
  return thestring

replacement_table = {"a": "on",
                     "b": "c",
                     "c": "va",
                     "d": "t",
                     "e": "i",
                     "f": "g",
                     "g": "h",
                     "h": "y",
                     "i": "e",
                     "j": "k",
                     "k": "li",
                     "l": "p",
                     "m": "n",
                     "n": "m",
                     "o": "a",
                     "p": "q",
                     "q": "x",
                     "r": "sh",
                     "s": "z",
                     "t": "d",
                     "u": "u",
                     "v": "w",
                     "w": "r",
                     "x": "j",
                     "y": "ie",
                     "z": "f"}

def decode(string):
    nstring = string.split()
    brf = []
    for string in nstring:
        lstring = list(string)
        for index in range(0, len(lstring)):
            char = lstring[index]
            if char in replacement_table.keys():
                lstring[index] = replacement_table[char]
            elif char.lower() in replacement_table.keys():
                lstring[index] = replacement_table[char.lower()].title()
        brf.append("".join(lstring))
    return " ".join(brf)

def main(argv=[]):
    x = " ".join(argv)
    if len(x) == 0:
        x = input("Enter string here: ")
    print(decode(x))

if __name__ == "__main__":
    main(sys.argv[1::])