def prompt_user():
while True:
master_pw = getpass('Master password: '******'Confirm password: '******'Confirmation didn\'t match. Try again.')
else:
break
service = input('Service name (e.g. facebook): ').lower()
number = input('number (leave blank to generate): ')
if number == '':
number = SystemRandom().choice(range(MAX_NUM + 1))
else:
assert number.isdigit(), "Must enter a valid digit. You entered: {}".format(number)
number = int(number)
assert 0 <= number <= MAX_NUM, "Number must be >= 0 and <= {}. You entered: {}".format(
str(MAX_NUM), str(number))
return master_pw, service, number
