如何在 Python 测验问题中使用 try/except

Question

我正在尝试在此代码中输入 try/except 以供输入字母而非数字的人使用

我的代码：

def quiz():
  while True:
    score = 0 
    for questions in Quiz_qs:
      print("\n" + i[0])
          if guess == i[1]:
          print("Correct!")
          score +=  1
          print(score, "out of 10”)
        else:
          print("\nincorrect!")
          print(score, "out of 10”)
          break
      

Quiz()

Answer 1

我也是初学者，但也许我可以帮助你，也可以学到一些东西。 我认为问题在于您并没有要求在尝试中获得 int 答案。 使用“if”语句，您只考虑正确答案，因此“else”包括不是正确答案的所有其他答案，也包括字符答案。 您应该设置另一个条件来检查答案是否为数字，除非不是，否则请致电。

希望我有所帮助。

Answer 2

更改您的代码如下：

G_statements = [["What is 5+5?", "10"]]
G_statements.append(["What is the square root of 9?", "3"])
G_statements.append(["What is 30 / 3", "10"])
G_statements.append(["What is 24 x 2", "48"])
G_statements.append(["What is 40 / 5", "8"])
G_statements.append(["What is 150 - 45", "105"])
G_statements.append(["What is 9x9", "81"])
G_statements.append(["What is 25+5", "30"])


def Generalquiz():
    score = 0
    for i in G_statements:
        print("\n" + i[0])
        while True:
            try:
                guess = int(input("\nAnswer:"))
                break
            except ValueError:
                print("Characters not accepted, Please enter a number")
            
        if guess == int(i[1]):
            print("Correct!")
            score = score + 1
            print(score, "out of 8")
            print("\n")
        else:
            print("\nincorrect!")
            print(score, "out of 8")
            print("\n")



Generalquiz()

Answer 3

G_statements = [["What is 5+5?", "10"],
                ["What is the square root of 9?", "3"],
                ["What is 30 / 3", "10"],
                ["What is 24 x 2", "48"],
                ["What is 40 / 5", "8"],
                ["What is 150 - 45", "105"],
                ["What is 9x9", "81"],
                ["What is 25+5", "30"]]

# python lists support multi type variables as such ["What is 25+5", 30]
# if you declare the list this way, you can simply do 'if guess == i[1]'

def Generalquiz():
    score = 0
    # ask a question
    for i in G_statements:
        print("\n" + i[0])

        # try to get a valid (not necessarily correct) answer
        while True: # keep asking for a valid input
            try: # TRY receiving a valid input
                guess = int(input("\nAnswer:")) # try to CAST input to INT, if successful, the input was int, otherwise raise a ValueError
                break
            except ValueError:
                print("Characters not accepted, Please enter a number")
                continue # as long as we have an error (that is the input wasn't an int) CONTINUE asking for a valid input

        # logic part   
        if guess == int(i[1]): # correct answer is a string (not the best way, see above comment), convert it to int
            score+=1
            print("Correct!", score, "out of ", len(G_statements)) # LENgth of G_statements, avoid constant values if possible
        else: print("\n\nincorrect!", score, "out of 8\n")

注释应该足以解释，如果您刚开始编码，请尝试将问题分解为更小的块并分别解决它们，祝您好运！