lazy import aware branch of pyflakes

[John Arbash Meinel]

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Michael Hudson wrote:
| I got tired of cleaning up the imports of a couple of bzrlib files by
| hand or by converting lazy imports to real imports, running pyflakes
| and then lazifying the imports again, so I came up with a better way:
| hacking pyflakes to understand lazy imports.
|
| The branch at:
|
|    https://code.edge.launchpad.net/~mwhudson/pyflakes/lazy-import-support
|
| does three things:
|
| 1) Parses lazy imports so that uses of the imported names don't give
|    'undefined name' warnings.
| 2) Warns if a lazily imported name is used at module level.
| 3) Warns for names that are imported eagerly but *not* used at module
|    level and so could be lazy.

Sounds nice.

|
| It produces rather a for bzrlib currently (though some of it is noise:
| pyflakes complains at this sort of thing:

Rather a ???

|
| import bzrlib.a_module
| import bzrlib.another_module
|
| which is probably a bug that should be fixed and submitted upstream).
| Unless someone beats me to it, I'll probably submit branches that
| clean some of this up, but the real value of a tool like this is
| running it regularly to stop unused import cruft gathering, and I'll
| try to do that too.
|
| Cheers,
| mwh
|
|

Also thanks for doing this. We might consider adding it to the test suite (part
of our source tests), but we would need to get it clean first.

John
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