tree c0ecd9e0c9f92e4ed37ffbe0be239b1284ac25f2
parent 305154c1f97374c2b4bb9ea45a9921d0a1c8c525
author Rob Arnold <robarnold@fb.com> 1383849937 -0800
committer Michael Bolin <mbolin@fb.com> 1384307571 -0800

python_library should not flatten libraries.

Summary:
Multi-file python libraries are often contained in a directory and
imported by that directory's name. Flattening the hierarchy will render that
module unimportable (or worse, possibly import only part of it). By copying the
unflattened subtree, we preserve the semantics of Python's module system while
retaining the isolation property.