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The getsource function in inspect.py breaks badly with
the @decorators.
The inspect mechanism scans backwards from the topmost
decorator until it finds some acceptable statement (it
can be anything: another function, an import line, etc.).
The patch takes care of that. It'll print all
decorators for a function as well as the function itself.

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Yeah ... It doesn't really fix anything.

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Yes, it does.

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Also fix that getsource really doesn't handle one-line
functions, with new patch.

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The patch seems okay on casual inspection, but it still
needs to have tests. Feel free to assign it to me after
adding those.

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Handling one-line functions fixes problem 1 reported in
http://python.org/sf/769569.

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Added tests for the patch.
Note that the patch for showing one-liners breaks two-line
lambdas.

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Eh, that should be:
Note that the patch for showing one-liners breaks showing
the source of two-line lambdas. Only the first line shows.

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Okay, I've checked in the patch that handles decorators as
rev 1.54 of inspect.py and rev 1.16 of test_inspect.py (note
that I integrated your tests into this file).
The oneline and twoline cases in test_inspect_decorators.py
don't fail for me, even without the patch, so I'm not
applying a patch that breaks a previously working case <wink>. 
If you're still interested in fixing this, I suggest you
write down all the test cases that should work (including
http://python.org/sf/769569 and having a twoline lambda at
the end of a file), see whether they fail now and open a new
tracker item with a patch that fixes those that don't.