This is the ETS proxy package, it contains the proxy modules for all ETS projects which map the old enthought namespace imports (version 3) to the namespace-refactored ETS packages (version 4). For example:
from enthought.traits.api import HasTraits
is now simply:
from traits.api import HasTraits
For convenience this package also contains a refactor tool to convert projects to the new namespace (such that the don't rely on the proxy):
$ ets3to4 -h usage: ets3to4 DIRECTORY This utility, can be used to convert projects from ETS version 3 to 4. It simply replaces old namespace strings (e.g. 'enthought.traits.api') to new ones (e.g. 'traits.api'), in all Python files in DIRECTORY recursively. Once the conversion of your project is complete, the etsproxy module should no longer be necessary. However, this tool is very simple and does not catch all corner cases.
This module will be removed in the future, and old-style (enthought.xxx) imports should be converted (over time) to the new ones.