How do I use raise correctly?

Question

Can someone please help me to get some kind of structure in this code? I am new to this. The errors should capture both non-existing files, and files that do not contain rows of four parts separated by ";".

The program should look something like this:

Name of quiz-file: hejsan
"That resulted in an input/output error, please try again!"

Name of quiz-file: namn.csv
"The file is not on the proper format. There needs to be four strings, separated by ; in each line of the file."

Name of quiz-file: quiz.csv

Where quiz.csv fullfills all the requirements!

def get_quiz_list_handle_exceptions():
    success = True
    while success:
        try:

            file = input("Name of quiz-file: ")
            file2 = open(file,'r')

            for lines in range(0,9):
                quiz_line = file2.readline()
                quiz_line.split(";")

                if len(quiz_line) != 4:
                    raise Exception

    except FileNotFoundError as error:
        print("That resulted in an input/output error, please try again!", error)

    except Exception:
        print("The file is not on the proper format. There needs to be four strings, separated by ; in each line of the file.")

    else:
    success = False


get_quiz_list_handle_exceptions()

Answer 1

You have numerous issues:

1. Failure to indent properly in several locations
2. Failure to keep the results of split, so your length test is testing a string's length, not the number of semi-colon separated components
3. (Minor) Not using with statements, nor closing your file, so the file handle could conceivably be left open indefinitely (depends on Python interpreter)

Fixed code:

def get_quiz_list_handle_exceptions():
    success = True
    while success:
        try:

            file = input("Name of quiz-file: ")
            with open(file,'r') as file2:  # Use with statement to guarantee file is closed
                for lines in range(0,9):
                    quiz_line = file2.readline()
                    quiz_line = quiz_line.split(";")

                    if len(quiz_line) != 4:
                        raise Exception

        # All your excepts/elses were insufficiently indented to match the try
        except FileNotFoundError as error:
            print("That resulted in an input/output error, please try again!", error)

        except Exception:
            print("The file is not on the proper format. There needs to be four strings, separated by ; in each line of the file.")
        else:
            success = False  # Fixed indent


get_quiz_list_handle_exceptions()