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Lots of work on exception handling, including tests for traceback printing....
Lots of work on exception handling, including tests for traceback printing. We finally have some tests for various exception mode printing, via doctests that exercise all three modes! Also changed handling of sys.exit(X) to only print the summary message, as SystemExit is most often a 'handled' exception. It can still be 100% silenced via '%run -e', but now it's much less intrusive. Added a new %tb magic to print the last available traceback with the current xmode. One can then re-print the last traceback with more detail if desired, without having to cause it again.
Brian Granger - - Load All Authors

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.. _history:
=======
History
=======
Origins
=======
IPython was starting in 2001 by Fernando Perez while he was a graduate student
at the University of Colorado, Boulder. IPython as we know it today grew out
of the following three projects:
* ipython by Fernando Pérez. Fernando began using Python and ipython began as
an outgrowth of his desire for things like Mathematica-style prompts, access
to previous output (again like Mathematica's % syntax) and a flexible
configuration system (something better than :envvar:`PYTHONSTARTUP`).
* IPP by Janko Hauser. Very well organized, great usability. Had
an old help system. IPP was used as the "container" code into
which Fernando added the functionality from ipython and LazyPython.
* LazyPython by Nathan Gray. Simple but very powerful. The quick
syntax (auto parens, auto quotes) and verbose/colored tracebacks
were all taken from here.
Here is how Fernando describes the early history of IPython:
When I found out about IPP and LazyPython I tried to join all three
into a unified system. I thought this could provide a very nice
working environment, both for regular programming and scientific
computing: shell-like features, IDL/Matlab numerics, Mathematica-type
prompt history and great object introspection and help facilities. I
think it worked reasonably well, though it was a lot more work than I
had initially planned.