## Previous name: LegitimateVillainousThings

Files
• main.py
main.py
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```
```def calcNum():
while True:
print("")
try:
num = int(input("Please enter the number you wish to calculate the check digit for: "))
if len(str(num)) == 7:
break
else:
print("Sorry, that number's not the right length. It must be exactly 7 digits long.")
except ValueError:
print("Sorry, but you need to input a number. Please try again.")
total = 0
for i in range(0,7):
if i % 2 == 1:
total += int(str(num)[i])
else:
total += 3*int(str(num)[i])
counter = 0
while counter < total:
counter += 10
checkdigit = counter - total
print("The check digit is",checkdigit)
num = int(str(num)+str(checkdigit))
print("The full barcode is",num)
print("")

def checkNum():
while True:
print("")
try:
num = int(input("Please enter the barcode you wish to validate: "))
if len(str(num)) == 8:
break
else:
print("Sorry, that barcode's not the right length. It must be exactly 8 digits long.")
except ValueError:
print("Sorry, but you need to input a number. Please try again.")
total = 0
for i in range(0,8):
if i % 2 == 1:
total += int(str(num)[i])
else:
total += 3*int(str(num)[i])
if total % 10 == 0:
print("Valid barcode!")
else:
print("Invalid barcode...")

def main():
while True:
try:
option = int(input("""Welcome to the GTIN-8 Barcode Checker!

Which option would you like to choose?

1. Calculate Check Digit
2. Check Barcode Validity
3. Quit

Choose the relevant number: """))
if option == 1:
calcNum()
elif option == 2:
checkNum()
elif option == 3:
break
else:
print("Sorry, that's not a valid option. Please enter the number of the option you wish to choose.")
except ValueError:
print("Sorry, that's not a valid option. Please enter the number of the option you wish to choose.")

main()```