Pycharm看不到定义好的东西

Question

因此，我正在尝试进行多项选择测试(目前仍处于测试阶段)，Pycharm没有看到定义好的变量/字符串。它可以在codeskulptor.org中工作，但不能在Pycharm中工作。我甚至在我的mac电脑上尝试过终端，但仍然没有成功。它在NameError中给出了相同的错误“文件”，第1行:名称'a‘未定义“。有人能帮我解决这个问题吗？"a在"\n(a)很小，很简单，没有核，“这就是问题的答案，问题在”问题(question_prompts，"a")“，我想是因为它就是在那里定义的，对吧？

import time

class Question:
    def __init__(self, prompt, answer):
        self.prompt = prompt
        self.answer = answer


question_prompts = [
    """prokaryotic cells have what characteristics?\n(a) are small and simple, lacks a nucleus, 
    do not have organells, are a single cell creatures, and have a cell wall.\n\n """
]

questions = [
    Question(question_prompts[0], "a")

]

print("Cell Unit Test")
time.sleep(2)
print("10 seconds until test time, take your stuff off your desk")
#time.sleep(10)
print("The test will now commence")
time.sleep(1)


def run_test(questions):
    score = 0
    for question in questions:
        print(question.prompt)
        answer = input("Answer:\n ")
        if answer == question.answer:
            print("Correct!\n")
            score += 1
        else:
            print("Wrong! The correct answer is " + question.answer + "\n")

    print("\nEnd of the test.")
    print("You got " + str(score) + " out of " + str(len(questions)) + " questions correct")


run_test(questions)



class Question:
    def __init__(self, prompt, answer):
        self.prompt = prompt
        self.answer = answer


question_prompts = [
    """prokaryotic cells have what characteristics?\n(a) are small and simple, lacks a nucleus, 
    do not have organelles, are single-cell creatures, and have a cell wall.\n\n """
]

questions = [
    Question(question_prompts[0], "a")

]

print("Cell Unit Test")
time.sleep(2)
print("10 seconds until test time, take your stuff off your desk")
#time.sleep(10)
print("The test will now commence")
time.sleep(1)


def run_test(questions):
    score = 0
    for question in questions:
        print(question.prompt)
        answer = input("Answer:\n ")
        if answer == question.answer:
            print("Correct!\n")
            score += 1
        else:
            print("Wrong! The correct answer is " + question.answer + "\n")

    print("\nEnd of the test.")
    print("You got " + str(score) + " out of " + str(len(questions)) + " questions correct")


run_test(questions)'

Answer 1

这是Python3代码，但是您正在使用Pycharm中的Python2解释器来解释它。之所以会出现这个错误，是因为Python2中的input具有“类似eval”的行为，并且它试图从字面上将您输入的"a“解释为要引用的变量。

将Pycharm中使用的解释器更改为Python 3解释器。或者，您也可以将input更改为raw_input，但通过使用print()来判断，这是为了在Python3解释器中运行。