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If you're a library or framework creator then it is nice to be able to create APIs that can be used either as decorators or context managers.
The contextdecorator module is a backport of new features added to the
contextlib module <http://docs.python.org/library/contextlib.html>
_ in
Python 3.2. contextdecorator works with Python 2.4+ including Python 3.
Context managers inheriting from ContextDecorator
have to implement
__enter__
and __exit__
as normal.
__exit__ <http://docs.python.org/reference/datamodel.html#object.__exit__>
_
retains its optional exception handling even when used as a decorator.
Example::
from contextdecorator import ContextDecorator
class mycontext(ContextDecorator): def enter(self): print 'Starting' return self
def __exit__(self, *exc):
print 'Finishing'
return False
@mycontext() ... def function(): ... print 'The bit in the middle' ... function() Starting The bit in the middle Finishing
with mycontext(): ... print 'The bit in the middle' ... Starting The bit in the middle Finishing
Existing context managers that already have a base class can be extended by
using ContextDecorator
as a mixin class::
from contextdecorator import ContextDecorator
class mycontext(ContextBaseClass, ContextDecorator): def enter(self): return self
def __exit__(self, *exc):
return False
contextdecorator also contains an implementation of contextlib.contextmanager <http://docs.python.org/library/contextlib.html#contextlib.contextmanager>
_
that uses ContextDecorator
. The context managers it creates can be used as
decorators as well as in with statements. ::
from contextdecorator import contextmanager
@contextmanager def mycontext(*args): print 'Started' try: yield finally: print 'Finished!'
@mycontext('some', 'args') ... def function(): ... print 'In the middle' ... Started In the middle Finished!
with mycontext('some', 'args'): ... print 'In the middle' ... Started In the middle Finished!
Repository and issue tracker:
contextdecorator on google code <http://code.google.com/p/contextdecorator/>
_The project is available for download from PyPI <http://pypi.python.org/pypi/contextdecorator>
_
so it can be easily installed:
| ``pip install -U contextdecorator``
| ``easy_install -U contextdecorator``
The tests require unittest2 <http://pypi.python.org/pypi/unittest2>
_
to run.
FAQs
Create APIs that work as decorators and as context managers.
We found that contextdecorator demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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