[Tutor] Reading from files problem

[Chris Castillo]

I am trying to open a text file and read multiple lines containing the
following:

745777686,Alam,Gaus,CIS,15,30,25,15,5,31,15,48,70,97
888209279,Anderson,Judy,Math Ed,14,30,30,13,11,30,16,18,58,72

I want to ask the user for the student number, check to see if that
number is even valid and display something like:

last name, first name, student number, major
time info was accessed(i know i need to import time module)
exam scores
homework scores
average score for the class

#Open and read text file

gradesfile = open("grades.dat", "rfor lines in gradesfile:
    lines = lines.split(",")
    identifier = lines[0]
    lastname = lines[1]
    firstname = lines[2]
    major = lines[3]
    hw1 = lines[4]
    hw2 = lines[5]
    hw3 = lines[6]
    hw4 = lines[7]
    hw5 = lines[8]
    hw6 = lines[9]
    hw7 = lines[10]
    test1 = lines[11]
    test2 = lines[12]
    test3 = lines[13]

    totalpoints = 550
    hwgrades = float(hw1) + float(hw2) + float(hw3) + float(hw4) +
float(hw5) + float(hw6) + float(hw7)
    testgrades = float(test1) + float(test2) + float(test3)
    studentpoints = float(hwgrades) + float(testgrades)
    avgrades = round(float(studentpoints / totalpoints) * 100.0, 2)

    print identifier


gradesfile.close()


That's what I have so far but I have a feeling I shouldn't use a for
loop. I would really like any help trying to figure out this program.
Thanks in advance.