I encountered the bug when installing a package with `python3 setup.py install --user`. After that, a second installation failed with this stack trace:
```
Traceback (most recent call last):                                                                                                                            
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 2191, in _handle_ns                                                                   
    loader = importer.find_spec(packageName).loader                                                                                                           
AttributeError: 'zipimporter' object has no attribute 'find_spec'                                                                                             

During handling of the above exception, another exception occurred:                                                                                           

Traceback (most recent call last):                                                                                                                            
  File "/home/klaus/devel/upstream/pass-git-helper/setup.py", line 1, in <module>                                                                             
    from setuptools import setup                                                                                                                              
  File "/usr/lib/python3/dist-packages/setuptools/__init__.py", line 16, in <module>                                                                          
    import setuptools.version                                                                                                                                 
  File "/usr/lib/python3/dist-packages/setuptools/version.py", line 1, in <module>                                                                            
    import pkg_resources                                                                                                                                      
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 3239, in <module>                                                                     
    def _initialize_master_working_set():                                                                                                                     
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 3222, in _call_aside                                                                  
    f(*args, **kwargs)                                                                                                                                        
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 3264, in _initialize_master_working_set                                               
    tuple(                                                                                                                                              
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 3265, in <genexpr>                                                                    
    dist.activate(replace=False)                                                                                                                              
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 2780, in activate                                                                     
    declare_namespace(pkg)                                                                                                                                    
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 2279, in declare_namespace                                                            
    _handle_ns(packageName, path_item)                                                                                                                        
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 2196, in _handle_ns                                                                   
    loader = importer.find_spec(packageName)                                                                                                                  
AttributeError: 'zipimporter' object has no attribute 'find_spec'
```

This error happens now also with different tools.

Solution is to `rm -fr ~/.local/lib`. But the next installation triggers the bug again.

The only solution is to install via `python3 setup.py install --user --old-and-unmanageable`.

When I look into the code of zipimport(er), I do not see any find_spec only the old find_loader.

Despite it is a core library, this must be fixed! And with that the name should match the name of the py file to make it able to find the relevant file.