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python - 程序给出了意外的输出——为什么?

转载 作者:太空宇宙 更新时间:2023-11-04 09:52:25 25 4
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我正在编写一个测试算术技能的程序。它应该生成随机问题,并给出随机操作。这是我的代码:

import random

score = 0
counter = 0
ops = ['+', '-', '*', '/']

def question():
num1 = random.randint(0,10)
num2 = random.randint(1,10) #Starts from 1 to avoid zerodivision error
operation = random.choice(ops)
question = float(input(f"What is {num1} {operation} {num2}?: "))
global answer
answer = eval(str(num1) + operation + str(num2))
global counter
counter = counter + 1


def points():
while counter < 10:
question()
if question == answer:
print("\nCorrect!\n")
global score
score = score + 1
else:
print(f"\nWrong! The answer is {answer}\n")


points()

print(f"\nYou got {score} out of {counter}")

但它给出了这个输出:

What is 9 + 3?: 12
Wrong! The answer is 12

如果输入与答案匹配,则应该说正确,并计算分数,最后打印出满分 10 分的分数。

请帮我解决这个问题。

最佳答案

问题出在

if question == answer:

在那一行中,question 是对您之前定义的function question() 的引用。由于 answer 是一些保存问题答案的 int,因此 == 始终为 False。您永远无法真正了解用户输入的内容。

要解决这个问题,请执行以下操作:

def question():
num1 = random.randint(0,10)
num2 = random.randint(1,10) #Starts from 1 to avoid zerodivision error
operation = random.choice(ops)
user_answer = float(input(f"What is {num1} {operation} {num2}?: "))
global answer
answer = eval(str(num1) + operation + str(num2))
global counter
counter = counter + 1

return user_answer

def points():
while counter < 10:
user_answer = question()
if user_answer == answer:
print("\nCorrect!\n")
global score
score = score + 1
else:
print(f"\nWrong! The answer is {answer}\n")

我更改了名称,以便更清楚地说明发生了什么。


作为附录,我强烈建议不要使用全局变量。它们几乎从不需要并且通常会混淆问题。例如,我认为

def question():
num1 = random.randint(0,10)
num2 = random.randint(1,10) #Starts from 1 to avoid zerodivision error
operation = random.choice(ops)

user_answer = float(input(f"What is {num1} {operation} {num2}?: "))
real_answer = eval(str(num1) + operation + str(num2))

return user_answer, real_answer

def points():
score = 0
for questions_asked in range(1, 11):
user_answer, real_answer = question()
if user_answer == real_answer:
print("\nCorrect!\n")
score += 1
else:
print(f"\nWrong! The answer is {answer}\n")

这使得程序流程更容易理解。

关于python - 程序给出了意外的输出——为什么?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/47255252/

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