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Is it 'fine' to instantiate a widget without parent parameter?


On 9/9/2019 8:30 PM, jfong at ms4.hinet.net wrote:
> Terry Reedy? 2019?9?9???? UTC+8??3?06?27????

>> There will only be one default Tk object, but there can be multiple Tk
>> objects.

>>>> import tkinter as tk
>>>> f0 = tk.Frame()

This causes creation of a default root

>>>> root0 = tk.Tk()

This creates another, hence two different objects.

>>>> f0.master
> <tkinter.Tk object at 0x015AB6F0>
>>>> root0
> <tkinter.Tk object at 0x015ABE50>

>>>> import tkinter as tk
>>>> root0 = tk.Tk()

This creates a root that is set as the default because there was not one 
already.

>>>> f0 = tk.Frame()

The uses the default root which is root0, hence 1 object.

>>>> f0.master
> <tkinter.Tk object at 0x0269B710>
>>>> root0
> <tkinter.Tk object at 0x0269B710>

-- 
Terry Jan Reedy