Generates spongebob meme text.

spongebob.py

#!/usr/bin/env python3
"""
About -
=======
Generates a randomly upper/lowercased
text from a given input. For example -
Input  : Hello World
Output : hEllO wORld

Input  : Spam and Eggs
Output : SPAm And eggS

API Usage -
===========
import spongebob as sponge
text = "Hello world"
meme_text = sponge.gen_random_str_upper(text)
print(meme_text)

CLI Usage -
===========
$ ./spongebob.py Hello world
HeLLO wOrLD

Interactive Usage -
===================
$ ./spongebob.py
> Hello world
HelLO wOrLd
> exit
bye
"""
import sys
import random


def generate_random_char_upper(s: str) -> str:
    """
    Takes in a string and returns with
    a random character uppercased.
    """
    char_index = random.randint(0, len(s)-1)
    if s[char_index].isupper():
        s = s.replace(s[char_index], s[char_index].lower())
    else:
        s = s.replace(s[char_index], s[char_index].upper())
    return s


def gen_random_str_upper(s: str) -> str:
    """
    Goes over a string exactly half + 1 times
    and keeps updating (or rather creating a 
    new copy) of itself with a random character
    uppercased because that's how the meme goes.
    """
    original = s
    if not isinstance(s, str):
        return s
    if s.isdigit():
        return s
    else:
        for i in range(int(len(s) / 2)+1):
            s = generate_random_char_upper(s)
        if s == original:
            if not s.isalnum():
                return s
            return gen_random_str_upper(s)
        return s


if __name__ == '__main__':
    if len(sys.argv) >= 2:
        inp = ' '.join(sys.argv[1:])
        print(gen_random_str_upper(inp))
        quit(0)
    else:
        try:
            while True:
                inp = input("> ")
                if inp == 'exit':
                    break
                print(gen_random_str_upper(inp))
        except (EOFError, KeyboardInterrupt):
            pass
        
        print('bye')