thon program which displays a simple menu as follows: Python ISBN Conversion Menu 1. Verify the check digit of an ISBN-10 2. Verify the check digit of an ISBN-13 3. Convert an ISBN-10 to an ISBN-13 4. Convert an ISBN-13 to an ISBN-10 5. Exit Please remember to use what you have learned during the semester such as: • Functions and/or Value Returning Functions • If structures or logic structures IF/Elif/ELSE • Data structures i.e. File input/output • String manipulations i.e. string slicing and lists, etc. • Modules • Loops i.e. WHILE loops or FOR loops I already created the program by using Python, but here is wha
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Python ISBN Conversion Menu
1. Verify the check digit of an ISBN-10
2. Verify the check digit of an ISBN-13
3. Convert an ISBN-10 to an ISBN-13
4. Convert an ISBN-13 to an ISBN-10
5. Exit
Please remember to use what you have learned during the semester such as:
• Functions and/or Value Returning Functions
• If structures or logic structures IF/Elif/ELSE
• Data structures i.e. File input/output
• String manipulations i.e. string slicing and lists, etc.
• Modules
• Loops i.e. WHILE loops or FOR loops
I already created the program by using Python, but here is what I need help with (in bold):
• Reading and writing data to a file(s). In other words, have the program to read ISBNs from a file and store the correct results in a file as well.
Can you include codes within my current program (included below) so that my program will read ISBNs from a file and store the correct results in a file as well?
* Please make sure to use the Python program when making out the code in specific. Thanks!
My current Python program:
def main():
menu()
def menu():
print('1. Verify the check digit of an ISBN-10.')
print('2. Verify the check digit of an ISBN-13.')
print('3. Convert an ISBN-10 to an ISBN-13.')
print('4. Convert an ISBN-13 to an ISBN-10.')
print('5. Exit')
command = input('Enter the command (1-5): ')
if command == '5':
return
elif command == '1' or command == '3':
ISBN = input('Please enter the ISBN-10 number: ')
ISBN = ISBN.replace('-', '')
while len(ISBN) != 10:
print('Please make sure you have entered a number that is exactly 10 characters long.')
ISBN = input('Please enter the ISBN number: ')
ISBN = ISBN.replace('-', '')
print(format(ISBN))
if command == '1':
print(check_10_digit(ISBN))
else:
print(convert_10_to_13(ISBN))
elif command == '2' or command == '4':
ISBN = input('Please enter the 13 digit number: ')
ISBN = ISBN.replace('-','')
while len(format(ISBN)) != 13:
print('Please make sure you have entered a number that is exactly 13 characters long.')
ISBN = input('Please enter the 13 digit number: ')
ISBN = ISBN.replace('-', '')
if command == '2':
print(check_13_digit(ISBN))
else:
print(convert_13_to_10(ISBN))
menu()
def check_10_digit(ISBN):
digit = 0
for i in range(len(ISBN)):
n = ISBN[i]
num = int(n)
digit += (i+1) * num
d10 = digit % 11
print('Your ISBN-10 is: ', ISBN, 'with a remainder of ', str(d10))
if d10 == 0:
print('Your ISBN-10 is valid.')
else:
print('Your ISBN-10 is NOT valid.')
def check_13_digit(ISBN):
n = str(ISBN)
digit = 0
for i in range(len(n)):
if i % 2 == 0:
digit += int(n[i])
else:
digit += int (n[i]) * 3
digit = digit % 10
if digit == 0:
print('Your remainder is: ', digit, ', which means that your ISBN-13 is valid.')
else:
print('Your remainder is: ', digit, ', which means that your ISBN-13 is NOT valid.')
def convert_10_to_13(ISBN):
ISBN_13 = '978' + ISBN[:-1]
n = str(ISBN_13)
digit = 0
for i in range(len(n)):
if i % 2 == 0:
digit += int(n[i])
else:
digit += int(n[i]) * 3
digit = digit % 10
ISBN_New = str(ISBN_13) + str(digit)
print('The ISBN-10 number ', ISBN, 'is converted to the ISBN-13 number ', ISBN_New)
def convert_13_to_10(ISBN):
if ISBN[:3] == '978':
n = str(ISBN[3:-1])
else :
raise 'ISBN is not convertible.'
digit = 0
for i in range(len(n)):
if i % 2 == 0:
digit += int(n[i])
else:
digit += int(n[i]) * 3
digit = 10 - (digit % 10)
ISBN_New = str(n) + str(digit)
print('The ISBN-13 number ', ISBN, 'is converted to the ISBN-10 number ', ISBN_New)
main()
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