gpa.py

gistfile1.txt

with open ('data.csv') as f:
    lines = f.readlines()

valid = []
for line in lines:
    a, b = line.strip('\n').split(',')
    if a=='1' or a=='2' or a=='3':
        print(a, b)
        valid.append((int(a), int(b)))

print(len(valid))
credits = sum([c for c, _ in valid])
print(credits)

ss = 0
for c, s in valid:
    if s>=80:
        ss = ss+4*c
        continue
    if s>=70:
        ss = ss+3*c
        continue
    if s>=60:
        ss = ss+2*c

print(ss/credits)