'''
########
#8. ISBN number
#As you know, every book has an unique ISBN number (International Standard Book Number).
#It is a 10-digit (or 13) code that uniquely specifies a book. Since this number is long, the right most digit is actually a "checksum"
#to roughly check if all the digits are correct (not mis-typed etc.) and forming a legit ISBN number. (checksum is also used in other places, like credit card number.)
#The rule is: when adding all the (10 numbers * its position (rightmost be position 1, leftmost be 10)) together, the sum should be divisible by 11.
#For example: ISBN 020131452-5 is legit since:
# (0*10 + 2*9 + 0*8 + 1*7 + 3*6 + 1*5 + 4*4 + 5*3 + 2*2 + 5*1)%11 = 88%11 = 0 the sum 88 is divisible by 11
#In fact, the cool thing is that the checksum (rightmost 5) is the only single digit number that can satisfy this rule. In other words, if you know the first
#9 digit, you can calculate the checksum (last digit). In this problem, you will be calculte the checksum of an ISBN number.
#########
'''
'''
Helper function 1: check_legit_ISBN
Input: a list with 10 single digit number in it
Output: return "Legit" if the 10 digits form a legit ISBN number
return "Not Legit" otherwise
Sample: [0,2,0,1,3,1,4,5,2,5] should return "Legit"
[0,2,0,1,3,1,4,5,2,3] should return "Not Legit"
'''
#def check_legit_ISBN(ISBNLis):
'''
Helper func 2: format output
input: a list with 10 numbers in it
output: format it to the correct ISBN format and return it
Sample:
[0,2,0,1,3,1,4,5,2,5] will become: "ISBN 020131452-5"
'''
#def format_ISBN(ISBNLis):
'''
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 0,1,2...X (X represents 10), 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.
(Technical googling practice - google how to append or remove an element from a list)
'''
#def checksum_ISBN(partISBN):
'''
Main Func: Generate a ISBN by:
add 9 random nunmbers into a list
(Technical googling practice - how to generate random numbers?)
call helper func 3 to find the checksum
Repeat 10 times
Generate 10 good ISBN numbers with one function call (not 10 digits for 1 ISBN)
Sample:
The correct checksum digit is:8. Now we have a legit ISBN:123456789-8
The correct checksum digit is:8. Now we have a legit ISBN:987654321-8
etc.
'''
#def generate_ten_ISBNs():
if __name__ == '__main__':
print("****Question 1****")
#you can add your functions calls here
#Please keep all the function calls and result printing