Model for a vending machine

vending_machine.py

# Model for a vending machine that has the following items
# Item #1       15
# Item #2       25
# Item #3       30

import re

def accept_tokens(tokens):
	regex = r'[ab]|[[aa|b][a|c]]|[ac]'
	regex_eval = re.findall(regex, tokens)
	return regex_eval

def check_validity(regex_eval):
	total = 0
	for item in regex_eval:
		total += 5 if item == 'a' else (10 if item == 'b' else (20 if item == 'c' else 0))
	print(total)
	print("Accepted" if (total == 15 or total == 25 or total == 30) else "Not accepted")

def main():
	tokens = input("[a = 5] [b = 10] [c = 20]\nEnter tokens: ")
	regex_eval = accept_tokens(tokens)
	check_validity(regex_eval)

main()