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Initial refactor of task dependency system....
Initial refactor of task dependency system. We are thinking about refactoring the task dependency system. Currently is is based on engine properties and a function sent with each task. In this commit, I have added a TaskRejectError that tasks can raise to indicate that the engine doesn't have the required dependencies. For now I have not removed any of the old stuff, but I have added warnings that we might remove the older *_prop* methods in IMultiEngine. See this ticket for more info: https://bugs.launchpad.net/bugs/361419

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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