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Mon Aug 8 15:33:16 EDT 2016 · https://mail.python.org/pipermail/python-dev/2016-August/145786.html

import timeit
import contextlib

@contextlib.contextmanager
def ctx1():
    yield

class ctx2:
    def __enter__(self):
        pass
    def __exit__(self, *args):
        pass

t1 = timeit.timeit("with ctx1(): pass", setup="from __main__ import ctx1")
t2 = timeit.timeit("with ctx2(): pass", setup="from __main__ import ctx2")
print("%.3f secs" % t1)
print("%.3f secs" % t2)
print("slowdown: -%.2fx" % (t1 / t2))

...with Python 3.5:

1.938 secs
0.443 secs
slowdown: -4.37x

I wanted to give it a try rewriting this in C but since @contextmanager has
a lot of magic I wanted to ask first whether this 1) is technically
possible 2) is desirable.
Thoughts?

-- 
Giampaolo - http://grodola.blogspot.com
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[Python-Dev] Rewrite @contextlib.contextmanager in C