rcase.py

#!/bin/python3
from random import getrandbits as bitrandie
import sys
import pyperclip

b = bool(bitrandie(1))

def getword(word):
    global b
    for letter in word:
      yield letter.upper() if b else letter.lower()
      b = not b

words = sys.argv[1:]

result = " ".join("".join(getword(word)) for word in words)

print(result)
pyperclip.copy(result)