Tell us what’s happening:
im just trying to understand what im doing wrong so i can write something that makes sense.
i think I have everything needed for the next few steps but i havent ordered them properly, i really just dont understand how to structure this, if someone could help me to understand how to structure it, that will really help me understand this more…
this is the bit of code im fumbling with(its the part at the end, the main() function definition.
def main():
if ',' not in user_input:
print('Ente
### Your code so far
```py
def validate_isbn(isbn, length):
if len(isbn, length) != length:
print(f'ISBN-{length} code should be {length} digits long.')
return
main_digits = isbn[0:length]
given_check_digit = isbn[length]
main_digits_list = [int(digit) for digit in main_digits]
# Calculate the check digit from other digits
if length == 10:
expected_check_digit = calculate_check_digit_10(main_digits_list)
else:
expected_check_digit = calculate_check_digit_13(main_digits_list)
# Check if the given check digit matches with the calculated check digit
if given_check_digit == expected_check_digit:
print('Valid ISBN Code.')
else:
print('Invalid ISBN Code.')
def calculate_check_digit_10(main_digits_list):
# Note: You don't have to fully understand the logic in this function.
digits_sum = 0
# Multiply each of the first 9 digits by its corresponding weight (10 to 2) and sum up the results
for index, digit in enumerate(main_digits_list):
digits_sum += digit * (10 - index)
# Find the remainder of dividing the sum by 11, then subtract it from 11
result = 11 - digits_sum % 11
# The calculation result can range from 1 to 11.
# If the result is 11, use 0.
# If the result is 10, use upper case X.
# Use the value as it is for other numbers.
if result == 11:
expected_check_digit = '0'
elif result == 10:
expected_check_digit = 'X'
else:
expected_check_digit = str(result)
return expected_check_digit
def calculate_check_digit_13(main_digits_list):
# Note: You don't have to fully understand the logic in this function.
digits_sum = 0
# Multiply each of the first 12 digits by 1 and 3 alternately (starting with 1), and sum up the results
for index, digit in enumerate(main_digits_list):
if index % 2 == 0:
digits_sum += digit * 1
else:
digits_sum += digit * 3
# Find the remainder of dividing the sum by 10, then subtract it from 10
result = 10 - digits_sum % 10
# The calculation result can range from 1 to 10.
# If the result is 10, use 0.
# Use the value as it is for other numbers.
if result == 10:
expected_check_digit = '0'
else:
expected_check_digit = str(result)
return expected_check_digit
def main():
if ',' not in user_input:
print('Enter comma-separated values.')
return
elif not length == 10 or length == 13:
print('Length should be 10 or 13.')
return
elif not isinstance(length, int):
print('Length must be a number.')
return
elif not isbn[0].isdigit():
print('Invalid character was found.')
return
else:
validate_isbn(isbn, length)
'''main()'''
1530051126,10
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Challenge Information:
Debug an ISBN Validator - Debug an ISBN Validator