Bundled path.py should not modify the os module
Python 3 compatibility for os.getcwdu()
Merge pull request #4469 from takluyver/py3-getcwdu

Python 3 & getcwdu

We were using the os.getcwdu() function in several places. That doesn't exist on Python 3, but the path.py module was masking that by setting os.getcwdu = os.getcwd. As described in #4462, however, that didn't always work.

This adds a reference in py3compat which points to getcwd on Python 3 and getcwdu in Python 2.