Hi everyone, I have a urgent question to ask and confirm.

If I have two functions as below:

import inkex

class Afunct(inkex.EffectExtension):

        something..... 

class Bfunct(inkex.EffectExtension):

       something.....

if __name__ == '__main__':

     if a > b: #For example

        Afunct().run()

        Bfunct().run()

Why the program will only run Afunct().run() but ignore Bfunct().run()?

Hope my question is clear to understand or else I will the make it more details.

Thank you

I have not seen an extension which contains multiple EffectExtension classes.

Generally there is only one. 

Types of extension classes can be seen here : https://inkscape.gitlab.io/extensions/documentation/source/inkex.extensions.html

The current list of bundled extensions are here:

https://gitlab.com/inkscape/extensions/

Have a look at the code. I think you will not find any with multiple Inkscape extension classes.

I think the general approach is to write defs  and only have one class.

I had a use-case where the user first generates an SVG and then later has an option to modify it. I considered doing this with two classes. Similar to the above, I tried running either Generate or EffectExtension depending on user options. However, in the end I went for EffectExtension because it seems to be a superset of what Generate can do.