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WERKZEUG v0.11 我stduy WERKZEUG的源代碼,文件wsgi.py類ClosingIterator,按功能implements_iterator decorted:裝飾器「implements_iterator」的功能是什麼?
wsgi.py
@implements_iterator
class ClosingIterator(object):
"""The WSGI specification requires that all middlewares and gateways
respect the `close` callback of an iterator. Because it is useful to add
another close action to a returned iterator and adding a custom iterator
is a boring task this class can be used for that::
return ClosingIterator(app(environ, start_response), [cleanup_session,
cleanup_locals])
If there is just one close function it can be passed instead of the list.
A closing iterator is not needed if the application uses response objects
and finishes the processing if the response is started::
try:
return response(environ, start_response)
finally:
cleanup_session()
cleanup_locals()
"""
我發現implements_iterator中的定義文件_compat.py:
implements_iterator = _identity
_identity = lambda x: x
的問題是: 是什麼implements_iterator的功能?