Question

Using Python3, how can you print out the subnet mask when it is given in slash notation? For example, a user types in /24 (do not worry about the slash). How would you convert that to binary? For example this would be written as 11111111.11111111.11111111.00000000. Please note, the user can change the number so do not hard code. The number can be any number from 1-32

Answer 1

def getOctet(n):
    if(n<0):
        n = 0
    return "1"*n+"0"*(8-n)

if __name__ == '__main__':
    n = int(input("subnet mask: "))
    result = ""
    for i in range(4):
        if(n>8):
            result += getOctet(8)
        else:
            result += getOctet(n)
        result = result +"."
        n = n - 8
    result = result[:-1]
    print(result)