Vowel Encoding: Python 3: 'vowel encoding' changes vowels to numbers in order to obfuscate context

vowel_encoding.py

#!/bin/python3
'''Use encoding to disguise message by converting vowels to numbers.'''
# Permission granted under “The MIT License” (open source)


def encode(s: str) -> str:
    enc = { 'a': '1', 'e': '2', 'i': '3', 'o': '4', 'u': '5' }
    return ''.join(enc[x] if x in enc else x for x in s)


def decode(s: str) -> str:
    dec = { '1': 'a', '2': 'e', '3': 'i', '4': 'o', '5': 'u' }
    return ''.join(dec[x] if x in dec else x for x in s)

The script could be executed locally in a Python shell using requests.get():

>>> from requests import get
>>> url = 'https://gist.githubusercontent.com/nick3499/aa82c6704c2c889f26d69540f9338583/raw/dd83c9678b36fa68411da97e070108e68c8d286e/vowel_encoding.py'
>>> exec(get(url).text)
>>> encode('hello')
'h2ll4'
>>> decode('h2ll4')
'hello'