Use importlib.resources.files with no argument

Question

I want to use importlib.resources.files to access a file from a module. According to the docs,

If the anchor is omitted, the caller’s module is used.

So I would assume something like

import importlib.resources

importlib.resources.files() # (+ some further calls afterwards to access the actual file)

should refer to the callers module. Instead, I get an error:

Traceback (most recent call last):        
  [...]                                                                                                                                                                                             
    importlib.resources.files()                                                                                                                                           
    ~~~~~~~~~~~~~~~~~~~~~~~~~^^                                                                                                                                           
  File "/usr/lib/python3.13/importlib/resources/_common.py", line 45, in wrapper                                                                                          
    return func()                                                                                                                                                         
  File "/usr/lib/python3.13/importlib/resources/_common.py", line 56, in files                                                                                            
    return from_package(resolve(anchor))                                                                                                                                  
  File "/usr/lib/python3.13/importlib/resources/_common.py", line 116, in from_package                                                                                    
    reader = spec.loader.get_resource_reader(spec.name)                                                                                                                   
                                             ^^^^^^^^^                                                                                                                    
  File "/usr/lib/python3.13/importlib/resources/_adapters.py", line 17, in __getattr__                                                                                    
    return getattr(self.spec, name)                                                                                                                                       
AttributeError: 'NoneType' object has no attribute 'name'

This does only happen when calling this from a file. Creating an __init__.py in the same directory does not help.

Using the same code from the python shell gives me

PosixPath('/usr/lib/python3.13/_pyrepl')

which sounds about right (but is not very helpful for actual use).

What is happening here? How is this intended to be used?

EDIT: There is also a similar question that wants to achieve the same thing. The accepted solution using __package__ does not work for me, as __package__ seems to be None too.