Credit Card Validation

README.md

Credit card validation

Checks if a credit card number is valid based off of the techniques from this infographic.

check.py

card = raw_input("Enter credit card number: ")
num = map(int, card.strip())
total = 0

for i in range(len(num)):
    if i % 2 == 0:
        con = num[i]*2
        total += con if con < 10 else 1 + (con % 10)
    else:
        total += num[i]

if total % 10 == 0:
    print "Valid credit card"
else:
    print "Invalid credit card; watch out!"

Thanks! Just something I wanted to code while going through old pictures on my computer. I also wanted to save it somewhere, and I figured a Gist would be a good place for it.