Python Language Server doesn't seem to work with namespace packages

[MikhailArkhipov]

Issue Type: Bug

I'm using the bare package made by python-cookiecutter here:
https://github.com/ionelmc/python-nameless

A fresh checkout followed by a pipenv install -e . results in a couple of problems for VSCode:

1. It can't find tests, though they are in the root, or more accurately, it says it can't find the tests, but if I look at the output log, it's running the tests, but failing on the initial import:

============================= test session starts ==============================
platform darwin -- Python 3.6.5, pytest-3.7.3, py-1.6.0, pluggy-0.7.1
rootdir: /Users/mjf/dev/python-nameless, inifile: setup.cfg
collected 0 items / 2 errors

==================================== ERRORS ====================================
___________________ ERROR collecting tests/test_nameless.py ____________________
tests/test_nameless.py:2: in <module>
    from nameless.cli import main
E   ModuleNotFoundError: No module named 'nameless'
___________________ ERROR collecting tests/test_nameless.py ____________________
ImportError while importing test module '/Users/mjf/dev/python-nameless/tests/test_nameless.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
tests/test_nameless.py:2: in <module>
    from nameless.cli import main
E   ModuleNotFoundError: No module named 'nameless'
=========================== short test summary info ============================
ERROR tests/test_nameless.py
ERROR tests/test_nameless.py
!!!!!!!!!!!!!!!!!!! Interrupted: 2 errors during collection !!!!!!!!!!!!!!!!!!!!
=========================== 2 error in 0.12 seconds ============================
__________There was an error in identifying unit tests in tests/test_nameless.py__________
___________________ ERROR collecting tests/test_nameless.py ____________________
tests/test_nameless.py:2: in <module>
    from nameless.cli import main
E   ModuleNotFoundError: No module named 'nameless'
__________There was an error in identifying unit tests in tests/test_nameless.py__________
___________________ ERROR collecting tests/test_nameless.py ____________________
ImportError while importing test module '/Users/mjf/dev/python-nameless/tests/test_nameless.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
tests/test_nameless.py:2: in <module>
    from nameless.cli import main
E   ModuleNotFoundError: No module named 'nameless'
__________There was an error in identifying unit tests in ============ short test summary info__________
=========================== short test summary info ============================
ERROR tests/test_nameless.py
ERROR tests/test_nameless.py
!!!!!!!!!!!!!!!!!!! Interrupted: 2 errors during collection !!!!!!!!!!!!!!!!!!!!

2. Opening a python file src/__main__.py shows green error lines on the from nameless.cli import main... it can't find nameless.cli with the following message in the tooltip: "[Python (analysis)] Unable to resolve 'nameless.cli'. IntelliSense may be missing for this module."

This isn't my code, but my code was made with this tool, and using this package directly from checkout should help eliminate any pilot error of my own doing :-)

Extension version: 2018.8.0
VS Code version: Code 1.27.1 (5944e81f3c46a3938a82c701f96d7a59b074cfdc, 2018-09-06T09:14:32.385Z)
OS version: Darwin x64 17.7.0

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-4850HQ CPU @ 2.30GHz (8 x 2300)
GPU Status	2d_canvas: enabled checker_imaging: disabled_off flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled multiple_raster_threads: enabled_on native_gpu_memory_buffers: enabled rasterization: unavailable_software video_decode: enabled video_encode: enabled webgl: enabled webgl2: enabled
Load (avg)	2, 2, 2
Memory (System)	16.00GB (0.21GB free)
Process Argv	/Applications/Visual Studio Code.app/Contents/MacOS/Electron
Screen Reader	no
VM	0%

[MikhailArkhipov]

May be the same as #12

[MikhailArkhipov]

#12
#281
microsoft/vscode-python#2213
microsoft/vscode-python#2319