Merge pull request #969 from takluyver/pexpect-u Improvements to pexpect to work correctly with Python 3. This brings in a more complete port of pexpect that I've been working on recently, called (for now) [pexpect-u]( http://pypi.python.org/pypi/pexpect-u/). It's compatible with Python 2.6 and up, including 2to3 conversion to Python 3. I've contacted the author of pexpect about working these changes back in. But this could take a while - pexpect has previously supported very old versions of Python (the docs claim it's been tested on Python 1.5), so I'll have to see how much compromise is possible.