为什么我的 while 循环不停止? [英] Why doesn't my while loop stop?

问题描述

我一直在阅读其他帖子，但无法弄清楚.无论我在重复结束时输入什么，它总是重复循环.我试过 while(repeat != "Quit" or repeat != "quit" or repeat != "b" or repeat != "B" or repeat != "no" or repeat != "No"): 但它仍然没有奏效.我不知道还能尝试什么.这个while循环有什么问题?

I've been reading other posts and couldn't figure it out. No matter what I enter at the end of this repeat it always repeats the loop. I've tried while(repeat != "Quit" or repeat != "quit" or repeat != "b" or repeat != "B" or repeat != "no" or repeat != "No"):but it still never worked. I don't know what else to try. What's wrong with this while loop?

    repeat = "d"
    print "Please answer questions using the choices (A, B, C, etc.)"
    time.sleep(2.1738)
    while repeat != "Quit" or repeat != "quit" or repeat != "b" or repeat != "B" or repeat != "no" or repeat != "No":
        print "A) Round Edges"
        print "B) Straight Edges"
        Edges1 = raw_input("Does the shape have round edges or straight edges?: ")
        if Edges1 == "a" or Edges1 == "A" or Edges1 == "Round Edges" or Edges1 == "round edges":
            print "A) Circle"
            print "B) Semi-Circle"
            Circle = raw_input("Is it a circle or semi-circle?: ")
            if Circle == "A" or Circle == "a" or Circle == "Circle" or Circle == "circle":
                radius_C = input("What is the radius (1/2 of the Diameter)?: ")
                Area_C = math.pi * radius_C ** 2.0
                Circum_C = 2.0 * math.pi * radius_C
                Diameter_C = 2.0 * radius_C
                print "The radius is " + str(radius_C) + ". "
                time.sleep(.5)
                print "The diameter is " + str(Diameter_C) + ". "
                time.sleep(.5)
                print "The circumference is " + str(round(Circum_C, 2)) + ". "
                time.sleep(.5)
                print "The area is " + str(round(Area_C, 2)) + ". "
                time.sleep(5)
            elif Circle == "B" or Circle == "b" or Circle == "Semi-Circle" or Circle == "semi-circle":
                radius_S = input("What is the radius (1/2 of the Diameter)?: ")
                Area_S = math.pi * radius_S ** 2.0 * .5
                Diameter_S = 2 * radius_S
                Per_S = ((math.pi * 2 * radius_S) / 2) + Diameter_S
                print "The radius is " + str(radius_S) + ". "
                time.sleep(.5)
                print "The diameter is " + str(Diameter_S) + ". "
                time.sleep(.5)
                print "The perimeter is " + str(round(Per_S, 2)) + ". "
                time.sleep(.5)
                print "The area is " + str(round(Area_S, 2)) + ". "
                time.sleep(5)
            else:
                print "Incorrect input."
        elif Edges1 == "b" or Edges1 == "B" or Edges1 == "Straight Edges" or Edges1== "straight edges":
            sides = input("How many sides does the shape have?: ")
            sideL = input("What is the length of 1 side?: ")
            Area = round(Area_R(sides, sideL), 4)
            Perim = round(Perm_R(sides, sideL), 4)
            print "The area of this figure is: " + str(Area)
            print "The perimeter of the figure is: " + str(Perim)
        else:
            print "Incorrect input."


        time.sleep(4)
        print" "
        print" "
        print "A) yes"
        print "B) No"
        repeat = raw_input("Want to try another?: ")
        time.sleep(1)
main()

推荐答案

好吧，我们来看看那个条件:

Well, let's take a look at that condition:

while repeat != "Quit" or repeat != "quit"

想一想.无论repeat 的值是什么，这总是正确的.repeat 总是不同于 "Quit" OR FROM "quit".如果是一个，就不会是另一个.

Think about it. No matter what the value of repeat is, this is always true. repeat will always be different from "Quit" OR FROM "quit". If it's the one, it won't be the other.

您需要它与退出"AND FROM退出"不同.试试这个:

You need it to be different from "Quit" AND FROM "quit". Try this:

while repeat != "Quit" and repeat != "quit" ...

或者，更紧凑:

while repeat.lower() not in ["quit", "b"]

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