ttk.Button 返回 None
我正在尝试使用 ttk.Button 的调用方法，如 TkDocs （查看“命令回调”），但我不断收到此错误：
AttributeError：“NoneType”对象没有属性“invoke”
因此，我在交互式 Shell 中尝试了此操作：
ActivePython 3.1.1.2 (ActiveState Software Inc.) based on
Python 3.1.1 (r311:74480, Aug 17 2009, 12:30:13) [MSC v.1500 32 bit (Intel)] on
win32
>>> from tkinter import *
>>> import tkinter.ttk as ttk
>>> root = Tk()
>>> button = ttk.Button(root, text="Test").grid(row=0, column=0)
>>> print(button)
None
这表明 ttk.Button 返回 None。
ttk.Button 是否意味着返回 None 。如果是这样，为什么 TkDocs 说有一个调用方法？
I am trying to use the invoke method of a ttk.Button, as shown at TkDocs (look at "The Command Callback"), but I keep getting this error:
AttributeError: 'NoneType' object has no attribute 'invoke'
So, I tried this in the Interactive Shell:
ActivePython 3.1.1.2 (ActiveState Software Inc.) based on
Python 3.1.1 (r311:74480, Aug 17 2009, 12:30:13) [MSC v.1500 32 bit (Intel)] on
win32
>>> from tkinter import *
>>> import tkinter.ttk as ttk
>>> root = Tk()
>>> button = ttk.Button(root, text="Test").grid(row=0, column=0)
>>> print(button)
None
Which shows that ttk.Button returns None.
Is ttk.Button meant to return None. And, if so, why does TkDocs say that there is an invoke method?
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不，你完全错了：你的代码不显示
ttk.Button返回None——它显示网格按钮对象上的方法返回None！您没有看到您正在对ttk.Button返回的任何内容（按钮对象）调用.grid，并且它是 的结果grid 调用您分配给“按钮”？！因此，请正确执行...：
现在您可以
打印按钮，当然结果会非常不同！-)No, you're entirely wrong: your code does not show that
ttk.ButtonreturnsNone-- it shows that thegridmethod on the button object returnsNone! Don't you see that you're calling.gridon whatever it is thatttk.Buttonreturns (the button object), and it's the result of that grid call that you're assigning to "button"?!So do it right instead...:
now you can
print buttonand of course the results will be very different!-)