lazy_module breaks built-in modules

[blyxxyz]

lazy_module breaks built-in modules (i.e. modules listed in sys.builtin_module_names) that haven't been loaded yet:

>>> import lazy_import
>>> math = lazy_import.lazy_module('math')
>>> math.log
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/ring/.local/lib/python3.6/site-packages/lazy_import/__init__.py", line 157, in __getattribute__
    return super(LazyModule, self).__getattribute__(attr)
AttributeError: module 'math' has no attribute 'log'

The same happens, for example, with zlib and pwd (but not with sys, because it's already loaded).

[mnmelo]

Thanks for this heads up.
I can confirm this occurs in python 3.6 but, interestingly, not in 2.7. It is boiling down to what is actually performed by the module reloading, and I suspect some internal is cutting corners in python 3 if it sees it's a builtin. I'll be looking into it.

[spacebuoy]

I can duplicate this error. I use ipython which imports many packages so I was not seeing this error and it does not occur with the cmd module I've been using, in case this helps:

cmd = lazy_import.lazy_module('cmd')
cmd
Lazily-loaded module cmd
cmd.Cmd
<class 'cmd.Cmd'>
cmd
<module 'cmd' from '/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/cmd.py'>

[mnmelo]

Ok, after some research I can see this is triggered not because those are builtins but because they are C-extensions. I can trigger the faulty behavior with a non builtin C-extension.

Trying to figure how I can tell the reloader to behave properly in these cases...

[jonas-eschle]

Are there any news on that?

[danlkv]

@mnmelo any updates? This would be very useful if it worked on my cpp extension module....