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Protect against absent global IPython instance....
Protect against absent global IPython instance. This basically applies most of the changes to ultraTB made by Brian in the reorg branch here: http://bazaar.launchpad.net/~ipython-dev/ipython/module-reorg/revision/1225 To our duplicate copies of ultraTB (the duplication is already gone in the reorg branch). This now means that the trial-based tests run fine if executed as trial IPython OR trial IPython.kernel where as the latter form was failing before. The reason why the former used to work was that a hidden global ipython is created, *upon import*, by ipdoctest. That will stay for now, but I've made it bug https://bugs.launchpad.net/ipython/+bug/409096 marked as critical for 0.11 that I'll need to fix.

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test_example.txt
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=====================================
Tests in example form - pure python
=====================================
This file contains doctest examples embedded as code blocks, using normal
Python prompts. See the accompanying file for similar examples using IPython
prompts (you can't mix both types within one file). The following will be run
as a test::
>>> 1+1
2
>>> print "hello"
hello
More than one example works::
>>> s="Hello World"
>>> s.upper()
'HELLO WORLD'
but you should note that the *entire* test file is considered to be a single
test. Individual code blocks that fail are printed separately as ``example
failures``, but the whole file is still counted and reported as one test.