像grep一样，但在docstring中搜索匹配项。
docgrep的Python项目详细描述
类似于grep，但只搜索docstring（在python代码中）。
安装
来自PIP:
$ pip install --upgrade docgrep
示例
$ docgrep 'Python 3.4' .
./asyncio/futures.py:113: """This class is *almost* compatible with concurrent.futures.Future.
Differences:
- result() and exception() do not take a timeout argument and
raise an exception when the future isn't done yet.
- Callbacks registered with add_done_callback() are always called
via the event loop's call_soon_threadsafe().
- This class is not compatible with the wait() and as_completed()
methods in the concurrent.futures package.
(In Python 3.4 or later we may be able to unify the implementations.)
"""
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