How to set file and module for object types implemented in C?

Question

I have a few custom types defined in C code.

When developing Python code based on these, I sometimes encounter an error, which is compounded when Python's own getfile() function (inside inspect.py) raises its own exception:

TypeError('{!r} is a built-in class'.format(object))

Because I'd like to see the underlying original error instead of the above, I'm wondering, if I can add the __module__ and the __file__ attributes to my own types. How would one do that?

The documentation seems to imply, attributes must be part of the object -- an obvious waste in the case like mine, when the values are exactly the same for all instances of the class -- how can I make them static?

If I try to implement type-specific attribute management, I suddenly lose access to the type's methods (because now they are treated as attributes).

Is it possible for such attributes to coexist with methods? How would I do that? My main target is Python-3.x...

user2357112 · Accepted Answer · 2018-09-05 01:48:09Z

2

In the tp_name slot of your C-level type definition, write the fully-qualified name:

"your_module.YourClass"

The __module__ of the type object will be set based on tp_name. The __file__ attribute of the module should already be handled automatically.

answered Sep 5, 2018 at 1:48

user2357112

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3 Comments

Mikhail T. Over a year ago

Thanks! This solves my particular problem. Still, I wonder, how would one have custom static attributes without losing access to methods...

user2357112 Over a year ago

@MikhailT.: stackoverflow.com/questions/2374334/…, but it's the wrong thing to do for __module__.

KarelPeeters Dec 23, 2024 at 16:41

See also the documentation around tp_name, explicitly setting __module__ in the type dict also works.

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