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don't perform costly 'difference_update' on dependencies...
don't perform costly 'difference_update' on dependencies Scheduler: set1.difference_update(set2) can be very slow if set2 is large, even if set1 is empty, so use faster set1 = set1.difference(set2), and don't perform any difference operation on empty dependencies. The result was a dramatic reduction in throughput after the scheduler has routed many thousands of tasks, even with no task dependencies.
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IPython README

Overview

Welcome to IPython. Our full documentation can be found in the docs/dist subdirectory in .html and .pdf formats, also available online at our docs repo. The docs/source directory contains the plaintext version of these manuals.

Dependencies and supported Python versions

For full details, see the installation section of the manual. The basic parts of IPython only need the Python standard library, but much of its more advanced functionality requires extra packages.

Officially, IPython requires Python version 2.6 or 2.7. An experimental port of IPython to Python 3.x is being developed at http://github.com/ipython/ipython-py3k.

Instant running

You can run IPython from this directory without even installing it system-wide by typing at the terminal:

$ python ipython.py