__all__ not being respected from an import *

[brettcannon]

microsoft/vscode-python#494

# A.py
import B
B. # intellisense shows `foo` and `bar`, but should only show `foo`.

# B.py
from C import *

# C.py
__all__ = ['foo']
foo = 42
bar = 24

[jakebailey]

Works in the new language server.

We have basic __all__ support, though not for more complicated expressions (like those which combine multiple modules' __all__s into a single list).

[jakebailey]

An unfortunate side effect of handling this but only partially means that we may under complete in some situations (especially projects like Django which do lots of fun stuff). I've opened #620 to track improving the support.

[jakebailey]

Repoening, the code which filters __all__ has been temporarily removed as commonly used libraries are using it in ways we can't handle yet.