sympy/sympy — pull request #920 by miham (2012-01-01 21:59:09+00:00)
Title: Make imports in functions.txt relative to files (submodules)

This way it is easier to cross-reference objects in the See Also sections of
docstrings (and elsewhere?) - files in the same file can be referenced just by
their name (you can for example reference asin in sin's See Also just by asin
instead of sympy.functions.elementary.trigonometric.asin). Objects from other
files still have to use full paths.

Also the viewcode Sphinx extension works properly in this setup (it doesn't work
when imports are relative to module's `__init__.py`).

I additionally imported the following objects:
* polar_lift
* exp_polar
* principal_branch
* periodic_argument