Tell us what’s happening:
can anyone help me i cant figure it out. i dont know what to do
Your code so far
def validate_isbn(isbn, length):
isbn_str = str(isbn)
if len(isbn_str) != length:
print(f'ISBN-{length} code should be {length} digits long.')
return
main_digits = isbn_str[0:length]
given_check_digit = isbn_str[length-1]
main_digits_list = [int(digit) for digit in main_digits]
# Calculate the check digit from other digits
if length == 10:
total = 0
for i in range(9):
total += int(isbn_str[i]) * (10 - i)
check_char = isbn_str[9]
if check_char == 'X':
check_value = 10
else:
check_value = int(check_char)
total += check_value
if total % 11 == 0:
print('Valid ISBN Code.')
return True
else:
print('Invalid ISBN Code.')
return False
elif length == 13:
total = 0
for i in range(13):
weight = 1 if i % 2 == 0 else 3
total += int(isbn_str[i]) * weight
if total % 10 == 0:
print('Valid ISBN Code.')
return True
else:
print('Invalid ISBN Code.')
return False
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():
user_input = input('Enter ISBN and length: ')
if "," not in user_input:
print("Enter comma-separated values.")
values = user_input.split(',')
try:
isbn = values[0] # keep as string
length = int(values[1])
except ValueError:
print("Invalid character was found.")
print("Length must be a number.")
if length == 10 or length == 13:
validate_isbn(isbn, length)
else:
print('Length should be 10 or 13.')
#main()
validate_isbn(080442957X,10)
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Challenge Information:
Debug an ISBN Validator - Debug an ISBN Validator