'NoneType' 对象没有属性 'config' [英] 'NoneType' object has no attribute 'config'

问题描述

我在这里要做的是将图像添加到我拥有的按钮上，然后根据单击或悬停更改图像.我遵循的所有示例都使用 .config() 方法.

What I am trying to do here is add the image to the button I have, then based on click or hover change the image. All the examples I have followed use the .config() method.

在我的一生中，我无法弄清楚为什么它不知道按钮对象是什么.有趣的是，如果我修改 Button 定义行以包含图像选项，一切都很好.但是，在那里似乎我无法使用 .config()

For the life of me I can't figure out why it doesn't know what the button object is. What is interesting is that if I modify the Button definition line to include the image option, everything is fine. But, with that there it seems I can't modify it using .config()

PlayUp = PhotoImage(file=currentdir+'Up_image.gif')
PlayDown = PhotoImage(file=currentdir+'Down_image.gif')
#Functions
def playButton():
    pButton.config(image=PlayDown)
pButton = Button(root, text="Play", command="playButton").grid(row=1)
pButton.config(image=PlayUp)

推荐答案

pButton = Button(root, text="Play", command="playButton").grid(row=1)

在这里，您正在创建一个 Button 类型的对象，但您立即对其调用了 grid 方法，该方法返回 None.因此，pButton 被分配了 None，这就是下一行失败的原因.

Here you are creating an object of type Button, but you are immediately calling the grid method over it, which returns None. Thus, pButton gets assigned None, and that's why the next row fails.

你应该这样做:

pButton = Button(root, text="Play", command="playButton")
pButton.grid(row=1)
pButton.config(image=PlayUp)

即首先，您创建按钮并将其分配给 pButton，然后您可以对其进行处理.

i.e. first you create the button and assign it to pButton, then you do stuff over it.

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