List index out of range? Python -

so i'm having trouble coding homework, i'm trying make gpa calculator , think complete part, won't work because keeps telling me there list index out of range in line 8.

def main():     file_name = input("enter filename:  ")     file = open(file_name, "r")     total = [0, 0]     count = [0, 0]     line in file:         sline = line[:-1].split(" ")         grade = sline[1]  # here         units = sline[2]         grade_points = (ord("e") - ord(grade))         print(grade, units, grade_points)     total = units * grade_points     gpa = total / units     print(total)  main() 

in line 8, says sline[2], index # 2. apparently split perform, doesn't produce 3rd index (remember, index's begin on 0, not 1). when split doesn't have 3rd index, you're asking without checking if exists, index out of range. that's why you're getting error.