.pop 和空列表的问题

Question

当我将我的代码放入一个循环中，并且我第二次运行时，它说列表中没有任何内容。无论如何，我是否可以重置该列表中的内容，以便当代码运行s 再次出现时，该列表再次包含其所有内容？我检查了其他问题，但他们的解决方案似乎不起作用。

global questions
questions = [class_question, color_question, life_question, vacation_question, patronus_question, skills_question, friends_question, values_question, pet_question]

def nextpart():
    user_interface()
    (questions.pop(0))()
    turtle.onscreenclick(shapedrawer)
    turtle.listen()


def quiz_loop():
    reply = raw_input("Do you want to take a quiz? Type Y for yes or N for no, lowercase.")
    while reply == "y": 
        beginning()
        nextpart()
        print ("")
        reply = raw_input("Unsatisfied with the house you got? \n Type Y to retake the quiz or N to end this program. \n Make sure that you use lowercase letters.")
        if reply == "n":
            print ("Okay, bye! Thanks for playing.")
    else:
        print ("I hope you enjoyed your experience.")

Answer 1

只需移动您的问题变量即可解决问题。

def nextpart():
    user_interface()
    (questions.pop(0))()
    turtle.onscreenclick(shapedrawer)
    turtle.listen()


def quiz_loop():
    reply = raw_input("Do you want to take a quiz? Type Y for yes or N for no, lowercase.")
    while reply == "y":
        questions = [class_question, color_question, life_question, vacation_question, patronus_question, skills_question, friends_question, values_question, pet_question]
        beginning()
        nextpart()
        print ("")
        reply = raw_input("Unsatisfied with the house you got? \n Type Y to retake the quiz or N to end this program. \n Make sure that you use lowercase letters.")
        if reply == "n":
            print ("Okay, bye! Thanks for playing.")
    else:
        print ("I hope you enjoyed your experience.")

Answer 2

我会为每个实例创建一个新的列表副本。

import copy    
global questions
questions = [class_question, color_question, life_question, vacation_question, patronus_question, skills_question, friends_question, values_question, pet_question]

def nextpart():
    localList = copy.copy(questions) #copy.copy will create a copy of the list
    user_interface()
    (localList.pop(0))()
    turtle.onscreenclick(shapedrawer)
    turtle.listen()

Answer 3

我的建议：通过all()和map()重写

questions = [1, 2, 3]

def ask(x):
    print(x)
    reply = input()

    if reply == 'n':
        print("Okay, bye! Thanks for playing.")
        return False

    return True

def loop():
    if all(map(ask, questions)):
        print ("I hope you enjoyed your experience.")

if __name__ == '__main__':
    loop()

demo1

1
y
2
y
3
y
I hope you enjoyed your experience.

demo2

1
y
2
n
Okay, bye! Thanks for playing.

.pop 和空列表的问题

Issues with .pop and empty list

python

turtle-graphics

python-2.7

python-3.x