caser.py

""" A program to change case using functions """

import sys

def caps_case(text):
	"""Returns the 1st character capitalized"""
	print(text.capitalize())
	
def title_case(text):
	"""Returns the 1st letter of all words capitalized"""
	print(text.title())
	
def upper_case(text):
	"""Returns the whole text in UPPER case"""
	print(text.upper())
		
def lower_case(text):
	"""Returns the whole text in lower case"""
	print(text.lower())
		
def exit(text):
	"""Ends the program."""
	print("Goodbye for now!")
	sys.exit()
	
if __name__ == "__main__":
	caser = {
	'capitalize': caps_case,
	'title': title_case,
	'upper': upper_case,
	'lower': lower_case,
	'exit': exit
	}
	
	options = caser.keys()
	prompt = 'Pick an option from the list ({0}): '.format(', '.join(options))
	#text = input("Please enter a string: ")
	while True:
		inp = input(prompt)
		text = input("Please enter a string: ")
		option = caser.get(inp, None)
		if option:
			option(text)
		else:
			print('Please select a valid option!')