pyTypingCinema | Typewriter effect in python

pyTypingCinema.py

#!/usr/bin/python3

import os, sys
from time import sleep

filename = ""
wait_before_each_char = 0.05
def cls():
    os.system('cls' if os.name=='nt' else 'clear')

def main():
	file_chars = open(filename, 'r').read()
	cls()
	file_string = ""
	for file_char in file_chars:
		file_string += file_char
		print(file_string)
		sleep(wait_before_each_char)
		cls()

if __name__ == "__main__":
	for arg_num in range(1, len(sys.argv)):
		arg = sys.argv[arg_num]
		if arg == '-w':
			wait_before_each_char = float(sys.argv[arg_num + 1])
		elif arg == '-f':
			filename = sys.argv[arg_num + 1]
		elif arg == '-h' or arg == '--help':
			print("""\
usage: pyTypingCinema [flag1] [flag1 arg]
-h          show this help menu and quit
-w [time]   how much time (in seconds) to wait before each char, decimals are also allowed
-f [file]   file to read from
""")
			sys.exit(0)
	main()