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Allow InputTransformers to raise SyntaxErrors...
Allow InputTransformers to raise SyntaxErrors This is a relatively trivial modification of the IPython main loop to catch a possible SyntaxError and print it instead of quitting. Doctesting this change is somewhat tricky since we actually need to run the main TerminalInteractiveShell.interact() loop, and is done through a subprocess and piping in a testcase.

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test_exampleip.txt
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Tests in example form - IPython
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You can write text files with examples that use IPython prompts (as long as you
use the nose ipython doctest plugin), but you can not mix and match prompt
styles in a single file. That is, you either use all ``>>>`` prompts or all
IPython-style prompts. Your test suite *can* have both types, you just need to
put each type of example in a separate. Using IPython prompts, you can paste
directly from your session::
In [5]: s="Hello World"
In [6]: s.upper()
Out[6]: 'HELLO WORLD'
Another example::
In [8]: 1+3
Out[8]: 4
Just like in IPython docstrings, you can use all IPython syntax and features::
In [9]: !echo "hello"
hello
In [10]: a='hi'
In [11]: !echo $a
hi