Question

我不确定为什么，但是当循环结束后我要求将其打印时，我的代码不会显示所选颜色的变量内容。程序运行时，所有输出为空白行，不输出任何文本。

如果有人可以提供对您有帮助的指针，谢谢。

def inputs(): firstColour = "" #Variables表示由for loop secondColour = "" thirdColour = "" patchSize = "" #States the number of patches in the grid

中输入的字母确定的三种颜色中的每一种

for i in range(3):

    patchColour = input ("Please choose a colour: r, g, b, m, c, o: ").lower()

    if patchColour == "r":
        colour = "red"
        print (colour)
    elif patchColour == "g":
        colour = "green"
        print (colour)
    elif patchColour == "b":
        colour = "blue"
        print (colour)
    elif patchColour == "m":
        colour = "magneta"
        print (colour)
    elif patchColour == "c":
        colour = "cyan"
        print (colour)
    elif patchColour == "o":
        colour = "orange"
    else:
        print("No valid input has been entered")
        break

    if i == 0:
        colour == firstColour
    elif i == 1:
        colour == secondColour
    elif i == 2:
        colour == thirdColour

    print(firstColour, secondColour, thirdColour)

Answer 1

本节：

if i == 0:
    colour == firstColour
elif i == 1:
    colour == secondColour
elif i == 2:
    colour == thirdColour

应该是：

if i == 0:
    firstColour = colour
elif i == 1:
    secondColour = colour
elif i == 2:
    thirdColour = colour

“ ==”用于比较项目是否相同，“ =”用于为变量分配值。另外，颜色和firstColour等...是错误的处理方法。当您稍后先打印出颜色时，您需要先为其分配一个值

For循环未在循环外保存变量

1 个答案: