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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