A率

gistfile1.py

#!/usr/bin/env python
# coding: utf-8

def main():
    f = open("campus", "r")
    all_credit=0
    a_credit=0
    for i in f.readlines():
        k =  i.replace("\n", "").split(",")
        if len(k) != 1 and k[6].isalpha() and k[6] != "D":
            all_credit += float(k[5])
            if(k[6] == "A"):
                a_credit += float(k[5])

    print "A率: %f" % (a_credit/all_credit * 100)
        
if __name__ == "__main__":
    main()