如何使用split（）分隔并显示文本文件以进行计算和平均

Question

I'm having trouble with the split() function. I have a module named printReport() that contains a name and 3 test scores in each line. I need to split the data so the names and scores can be displayed and have the average calculated. I'm positive I'm trying to do this completely wrong. I'm getting an IndexError: list index out of range. This is only the start of my problem. I still have no idea how to do the calculations and be displayed like below.

---

Student Name Score 1 Score 2 Score 3 Total

---

Dave 82 91 77 250

Tom 79 22 84 185

Dick 67 22 91 180

---

Mon Feb 8 15:12:08 2016

Can someone please explain what I'm doing wrong and how I would fix it.

    ### Subprogram detStudentData(fn, scores)

    def getStudentData(fn, scores):
        #   Writes instructions for the user to follow
        print("Enter the student names and scores following the prompts below.")
        print("To finish entering student names, enter: ZZZ.\n")

        #   Set the flag for the loop
        done = False
        #   Loop to get input from the usere
        while done != True:

            #   Creates a newFile and enables append
            newFile = open(fn, "a")
            #   Asks for a student name and assigns it to student_name
            student_name = input("Please enter the student name (ZZZ to finish): ")
            #   Compairs student_name to see if it is equal to "ZZZ"
            if student_name == "ZZZ":
                #   Sets the flag to True to exit the loop
                done = True
            #   Asks for test scores if student_name is not equal "ZZZ"
            else:
                #   Asks for test score 1 and assigns it to test_1
                test_1 = input("Enter score 1: ")
                #   Asks for test score 2 and assigns it to test_2
                test_2 = input("Enter score 2: ")
                #   Asks for test score 3 and assigns it to test_3
                test_3 = input("Enter score 3: ")
                print("\n")

                newFile.write(student_name) #  Writes student_name to newFile
                newFile.write(", ")         #  Writes "," to newFile
                newFile.write(test_1)       #  Writes test_1 to newFile
                newFile.write(", ")         #  Writes "," to newFile
                newFile.write(test_2)       #  Writes test_2e to newFile
                newFile.write(", ")         #  Writes "," to newFile
                newFile.write(test_3)       #  Writes test_3 to newFile
                newFile.write("\n")         #  Wites a return to newFile

            #   Closes newFile
            newFile.close()
    # ==============================================================================

    ### Subprogram getTextFileContents(fn)

    def getTextFileContents(fn):
        #   Opens the file and enables read
        with open(fn, "r") as ins:
            #   Splits the text file before the ","
            list = fn.split(",")

            #   Creates a loop to load the characters into a list
            for line in ins:
                #   Appends the text to list
                list.append(line)

        # Returns the value in list
        return list


    # ==============================================================================

    ### Subprogram printReport(line)

    def printReport(line):
        #   Prints the heading to show the test scores
        print("__________________________________________________________")
        print("Student Name     Score 1     Score 2     Score 3     Total")
        print("----------------------------------------------------------")

        name = []       #   Declare name a list
        test1 = []      #   Declare test1 a list
        test2 = []      #   Declare test2 a list
        test3 = []      #   Declare test a list

        with open("grades.txt", "r") as f:
            for line in f:
                name.append(line.split(",", 1)[0])
            line = name[0]
            capacity = len(name)
            index = 0
            while index != capacity:
                line = name[index]
                for nameOut in line.split():
                    print(nameOut)
                    index = index + 1

        # ================================================

        with open("grades.txt", "r") as f:
            for line in f:
                test1.append(line.split(",", -1)[1])
            line = test1[1]
            capacity = len(test1)
            index1 = 0
            while index1 != capacity:
                line = test1[index1]
                for t1Out in line.split():
                    print(t1Out)
                    index1 = index1 + 1

        # ================================================

        with open("grades.txt", "r") as f:
            for line in f:
                test2.append(line.split(",", -1)[2])
            line = test2[2]
            capacity = len(test2)
            index2 = 0
            while index2 != capacity:
                line = test2[index2]
                for t2Out in line.split():
                    print(t2Out)
                    index2 = index2 + 1

        # ================================================

        with open("grades.txt", "r") as f:
            for line in f:
                test3.append(line.split(" ", -1)[3])
            line = test3[3]
            capacity = len(test3)
            index3 = 0
            while index != capacity:
                line = test3[index3]
                for t3Out in line.split():
                    print(t3Out)
                    index3 = index3 + 1

    # ==============================================================================
    def main():


        fn = "grades.txt"               #   set the working file name
        scores = 3                      #   set the number of scores
        getStudentData(fn, scores)      #   Calls getStudentData()
        line = getTextFileContents(fn)  #   Assigns getTextFileContent() to line
        printReport(line)               #   Calls printReport()

    main()

Answer 1

Check the lines

line = test1[1]
line = test2[2]
line = test3[3]

You should start the list from 0 , not 1 , 2 , 3

Answer 2

The offending section is this:

        while index != capacity:
            line = test3[index3]
            for t3Out in line.split():
                print(t3Out)
                index3 = index3 + 1

The first line should be:

while index3 != capacity:

Note that manually incrementing an index is probably not the best way to loop over a list in Python. A more pythonic way might be something like:

for item in test3:
    for t3out in item.split():
         print(t3out)

Also, if you're going to stick with incrementing manually, you need to remove the index = index + 1 from inside the for loop. You should only increment after processing each line.

        while index != capacity:
            line = test3[index3]
            for t3Out in line.split():
                print(t3Out)
            index3 = index3 + 1