according to the pset instructions a number must come at the end and a number can't be used in the middle of a plate; surprisingly check passed CS50P as valid(expected invalid) and CS50P2 as invalid. Moreover, my if statement sliced a plate from the first occurrence of a digit to the end of a plate and check if it is a digit; with this statement I was expecting any character that appear after the first occurrence of a digit should be a digit else the plate will be invalid, sadly it is not what I get.
Here is my code
def main():
# prompt the user for input; trip it
plate = input("Plate: ")
# check validity of the input
if is_valid(plate):
# print valid or invalid
print("Valid")
else:
print("Invalid")
def is_valid(s):
# check if is alphanumeric, check length and check atleast first two characters are alphabetic
if s.isalnum() and 2 <= len(s) <= 6 and s[0:2].isalpha():
i = 0
while i < len(s):
#check if first is "0"
if s[i].isdigit():
if s[i] == "0" or s[i:len(s) - 1].isdigit() == False:
return False
else:
break
i = i + 1
return True
else:
return False
main()
My check50 passed perfectly but I wasn't expecting CS50P to pass as valid and CS50P2 passed as invalid (as expected).
