有所为,有所不为 歌词:如果的事
May 12

在看Dive Into Python,下面的Python代码是第4章《自省的威力》的示例,运行一下,object可以是list、tuple、dictionary等。然后思考一下,如果用Java或C#写,大概要多少代码呢?另外,”None is None”是啥语言呢?英语?Python?都对!呵呵!

def info(object, spacing=10, collapse=1):

    “”"Print methods and doc strings.

   
    Takes module, class, list, dictionary, or string.”"”

   
    methodList = [method for method in dir(object) if callable(getattr(object, method))]

    processFunc = collapse and (lambda s: ” “.join(s.split())) or (lambda s: s)

    print “\n”.join(["%s %s" %

        (method.ljust(spacing),

        processFunc(str(getattr(object, method).__doc__)))

        for method in methodList])

if __name__ == “__main__”:

    print info.__doc__

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