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function in urllib.request.build_opener()
 def isclass(obj):
 return isinstance(obj, type) or hasattr(obj, "__bases__")
should it be `obj` or `obj.__class__`?
cause in the man of 3.4, there is only `class.__bases__`, but the code there may function like `instance.__bases__`.
=======
# my code behave like this: 
cookie = http.cookiejar.CookieJar()
cookie_handler = urllib.request.HTTPCookieProcessor(cookie)
opener = urllib.request.build_opener(cookie_handler)
# the variable `skip` in `build_opener` will be empty cause `isclass(obj)` always return false. 
cookie_handler.__bases__
AttributeError: 'HTTPCookieProcessor' object has no attribute '__bases__'
cookie_handler.__class__.__bases__
(<class 'urllib.request.BaseHandler'>,)

get the __doc__ in a wrong way, it works now.