Is it possible to call a class but without a new instance created?

[Jach Fong]

Jim Lee at 2018/6/19 PM 03:44 wrote:
> 
> 
> On 06/18/2018 09:22 PM, Jach Fong wrote:
>> Ben Finney at 2018/6/19 PM 10:20 wrote:
>>> Jach Fong <jfong at ms4.hinet.net> writes:
>>>
>>>> Although it passed the first examination, I have no idea if it can
>>>> work correctly in the real application:-)
>>>
>>> Neither do I. What is the real-world problem you are trying to solve?
>>> Why do you think this (and not some more idiomatic Python feature) is
>>> needed for solving that problem?
>>>
>> No, I don't have any specific application in mind. This idea was just
>> triggered by a sentence in a Docstring in file font.py.
>>
>> class Font:
>>     """Represents a named font.
>>     Constructor options are:
>>     ...
>>     exists -- does a named font by this name already exist?
>>        Creates a new named font if False, points to the existing font 
>> if True.
>>     ...
>>     """
>>
>> But honestly I still don't know how it "points to the existing font":-(
>>
>>
> If the font exists, the Font object calls this:
>      tk.call("font", "configure", self.name, *font)
> Otherwise, it calls this:
>      tk.call("font", "create", self.name, *font)

If the Font was called through nametofont, then the font is None
and neither will be called:-)

--Jach

> The font caching is all handled by Tk, not Python.  The Font object is 
> just a wrapper around calls to Tk.
> 
> -Jim
> 

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