I’m getting stuck at other steps, can someone help me
Your code so far
def validate_isbn(isbn, length):
if len(isbn) != 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():
try:
user_input = input('Enter ISBN and length: ')
values = user_input.split(',')
isbn = values[0]
length = int(values[1])
if length == 10 or length == 13:
validate_isbn(isbn, length)
else:
print('Length should be 10 or 13.')
except IndexError:
print('Enter comma-separated values.')
except ValueError:
print('Length must be a number.')
main()
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I failed at 8. When the user enters an incorrect ISBN code with characters other than numbers, you should see the message Invalid character was found. in the console.
Failed:9. When the user enters 1530051126,10, you should see the message Valid ISBN Code. in the console.
Failed:10. When the user enters 9781530051120,13, you should see the message Valid ISBN Code..
Failed:11. When the user enters 1530051125,10, you should see the message Invalid ISBN Code..
Failed:12. When the user enters 9781530051120,10, you should see the message ISBN-10 code should be 10 digits long..
Failed:13. When the user enters 1530051126,13, you should see the message ISBN-13 code should be 13 digits long..
Failed:14. When the user enters 15-0051126,10, you should see the message Invalid character was found. and 18. When the user enters 9971502100,10, you should see the message Valid ISBN Code..
Failed:19. When the user enters 080442957X,10, you should see the message Valid ISBN Code..
Failed:20. When the user enters 9781947172104,13, you should see the message Valid ISBN Code..
When the user enters an incorrect ISBN code with characters other than numbers, you should see the message Invalid character was found. in the console.
I was good with that the issue now is printing out 'Valid ISBN Code‘ to the console as when I test with 1530051126,10 it prints the opposite. So Im getting stuck at 9. 19. and 20.
I know it lies at the given_check_digit variable as when print out the message to the console, it will check if the given_check_digit is equal to the expected_check_digit
def validate_isbn(isbn, length):
if len(isbn) != length:
print(f'ISBN-{length} code should be {length} digits long.')
return
main_digits = isbn\[0:length\]
given_check_digit = isbn\[length - 1\]#ISSUE HERE
try:
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.')
except ValueError:
print('Invalid character was found.')
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():
try:
user_input = input('Enter ISBN and length: ')
values = user_input.split(',')
isbn = values\[0\]
length = int(values\[1\])
if length == 10 or length == 13:
validate_isbn(isbn, length)
else:
print('Length should be 10 or 13.')
except IndexError:
print('Enter comma-separated values.')
except ValueError:
print('Length must be a number.')
except TypeError:
print('Invalid character was found')
#main()
I’ve edited your post to improve the readability of the code. When you enter a code block into a forum post, please precede it with three backticks to make it easier to read.
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