Identifying exception categories in an excepthook() handler

[stonebreaker (Ian Crawford)]

Thanks. I’m puzzled because:

Built-in Types

… speaks of ‘certain object types’ possessing a function to return their subclasses.

Unfortunately, elsewhere in the forums use of this method is discouraged due to various problems:

Looking for a way to track all subclasses of a given class

From the reference documentation for __subclasses__: Each class keeps a list of weak references to its immediate subclasses. This method returns a list of all those references still alive. The list is in definition order. The give-away is “weak”. It is obviously meant to not be up-to-date, so I expect your wish to make it so will not be granted. When you look at the list when it is up-to-date, there may be surprises. I altered your first example a little: >>> class Foo(): ... pass .…

But there’s a hint to use the issubclass() built-in:

Looking for a way to track all subclasses of a given class

From the reference documentation for __subclasses__: Each class keeps a list of weak references to its immediate subclasses. This method returns a list of all those references still alive. The list is in definition order. The give-away is “weak”. It is obviously meant to not be up-to-date, so I expect your wish to make it so will not be granted. When you look at the list when it is up-to-date, there may be surprises. I altered your first example a little: >>> class Foo(): ... pass .…

So I’ll try that next.