将变量附加到文本文件在 Python 中不起作用

Question

I am trying to get my program to output two variables to a text file after it finishes running something but all I get is the folder and no text files inside of it. Here is the code in question:

I have edited to include the entire program.

 import random #needed for the random question creation import os #needed for when the scores will be appended to a text file #import csv #work in progress answer = 0 #just to ensure a strage error isn't created by the input validation (since converting to a global variable isn't really needed) global questionnumber #sets the question number to be a global variable so that questionnumber = 0 global score score = 0 global name name = "a" def check_input(user_input): #used to verify that input by user is a valid number try: #the condition that does the checking answer = int (user_input) except ValueError: #what to do if the number isn't actually a number return fail() #calls the failure message return answer #sends the answer back to the rest of the program def fail(): #the failure message procedure defined print("That isn't a whole number! Try again with a different question") #tells the user what's going on global questionnumber #calls the global variable for this procedure questionnumber = questionnumber - 1 #allows the user, who made a mistake, a second chance to get it right def questions(): #the question procedure defined global name name=input("Enter your name: ") #gets the user's name for logging and also outputting messages to them print("Hello there",name,"! Please answer 10 random maths questions for this test!") #outputs welcome message to the user ClassOfStudent=input("Which class are you in?") #gets the user's class for logging finish = False while finish == False: #only occurs if "finish" isn't set to true so that the questions asked don't exceed ten global questionnumber #calls the global variable global score choice = random.choice("+-x") #uses the random function to choose the operator if questionnumber < 10 | questionnumber >= 0: #validation to ensure the question number is within ten number1 = random.randrange(1,12) #uses random numbers from the random function, above 1 and below 12 number2 = random.randrange(1,12) #same as the abovem for the second number print((number1),(choice),(number2)) #outputs the sum for the student to answer answer=check_input((input("What is the answer?"))) #asks for the student's answer questionnumber = questionnumber + 1 #adds one to the numebvr of questions asked if choice==("+"): #if the ramdomly generated operator was plus correctanswer = number1+number2 #operator is used with the numbers to work out the right answer if answer==correctanswer: #checks the studen't answer is right print("That's the correct answer") #if it is, it tells the student score = score + 1 #adds one to the score that the user has else: print("Wrong answer, the answer was",correctanswer,"!") #if the answer is wrong, it tells the student and doesn't add one to the score if choice==("x"): #essentially the same as the addition, but with a multiplicatin operator instead correctanswer = number1*number2 if answer==correctanswer: print("That's the correct answer") score = score + 1 else: print("Wrong answer, the answer was",correctanswer,"!") elif choice==("-"): #essentially the same as the addition, but with a subtraction operator instead correctanswer = number1-number2 if answer==correctanswer: print("That's the correct answer") score = score + 1 else: print("Wrong answer, the answer was",correctanswer,"!") else: #if the number of questions asked is ten, it goes on to end the program finish = True else: print("Good job",name,"! You have finished the quiz") #outputs a message to the user to tell them that they've finished the quiz print("You scored " + str(score) + "/10 questions.") #ouputs the user's score to let them know how well they've done #all below here is a work in progress #Create a new directory for the scores to go in, if it is not there already. if os.path.exists("Scores") == False: os.mkdir("Scores") os.chdir("Scores") if ClassOfStudent==1: #write scores to class 1 text file_var = open("Class 1.txt",'w+') file_var.write("name, score") file_var.close() if ClassOfStudent==2: #write score to class 2 text file_var = open("Class 2.txt",'w+') file_var.write(name, score) file_var.close() if ClassOfStudent==3: #write score to class 3 text file_var = open("Class 3.txt",'w+') file_var.write(name, score) file_var.close() questions()

Answer 1

ClassOfStudent is a string rather than a number, so none of the code that writes to the file will get executed. You can easily verify that by adding a print statement under each if so you can see if that code is being executed.

The solution is to compare to strings, or convert ClassOfStudent to an i teger.

Answer 2

first you have a problem with the "". you have to correct the following:

if ClassOfStudent==2: #write scores to class 1 text
            file_var = open("Class 2.txt",'w+')
            file_var.write("name, score")
            file_var.close()
if ClassOfStudent==3: #write scores to class 1 text
            file_var = open("Class 3.txt",'w+')
            file_var.write("name, score")
            file_var.close()

notice that I added the "" inside the write. In any case, I think what you want is something like: file_var.write("name %s, score %s"%(name,score)). This should be more appropriate.

Answer 3

Use print(repr(ClassOfStudent)) to show the value and type:

>>> ClassOfStudent = input("Which class are you in?")
Which class are you in?2
>>> print(repr(ClassOfStudent))
'2'

Using input() in Python 3 will read the value in as a string. You need to either convert it to an int or do the comparison against a string.

ClassOfStudent = int(input("Which class are you in?")

should fix your problem.