Question

IN PYTHON

'''
Helper func 3: checksum_ISBN
Input: a list with 9 single digit number in it (first 9 digit in ISBN)
Output: print out: "The correct checksum digit is:__. Now we have a legit ISBN: _____"
Hint: just loop through 0-9, test every one with helper func1 to find out the one checksum that forms a legit ISBN
with the correct ISBN in lis (10 numbers), call helper func2 to format it correctly. Then print the final result.
'''
#def checksum_ISBN(partISBN):

------------------------------------------------------------------------------------------------------------------------------------------------

function1:

def check_legit_ISBN(ISBNLis):
size = len(ISBNLis)
total = 0
for ch in ISBNLis:
value = int(ch)
total += value * size
size -= 1
if total % 11 == 0:
return "Legit"
else:
return "Not Legit"
------------------------------------------------------------

function 2:

def format_ISBN(ISBNLis):
i=0

res="ISBN "

#appending the digits from the list

while(i<9):

res=res+str(ISBNLis[i])

i=i+1

Answer 1

def check_legit_ISBN(ISBNLis):
    size = len(ISBNLis)
    total = 0
    for ch in ISBNLis:
        value = int(ch)
        total += value * size
        size -= 1
    if total % 11 == 0:
        return "Legit"
    else:
        return "Not Legit"

def format_ISBN(ISBNLis):
    i=0
    res="ISBN "
    #appending the digits from the list
    while(i<9):
        res=res+str(ISBNLis[i])
    i=i+1

def checksum_ISBN(partISBN):
    for num in range(0, 10):
        if check_legit_ISBN(partISBN + [num]) == "Legit":
            print("The correct checksum digit is:%d. Now we have a legit ISBN: %s" % (num, format_ISBN(partISBN + [num])))
            return

Please upvote, as i have given the exact answer as asked in question. Still in case of any concerns in code, let me know in comments. Thanks!