Ezio Melotti added the comment:
I often write code like:
import time
start = time.time()
...
end = time.time()
print(end - start)
Usually I don't do this to measure accurately the performance of some piece of
code, but rather I do it for tasks that take some time (e.g. downloading a
file, or anything that I can leave there for a while and come back later to see
how long it took).
So I'm +1 on a simple context manager that replaces this common snippet, and -0
on something that tries to measure accurately some piece of code (if it takes a
few seconds or more, high-accuracy doesn't matter; if it takes a fraction of
seconds, I won't trust the result without repeating the measurement in a loop).
Regarding the implementation I can think about 2 things I might want:
1) a way to retrieve the time (possibly as a timedelta-like object [0]), e.g.:
with elapsed_time() as t:
...
print(t.seconds)
2) a way to print a default message (this could also be the default behavior,
with a silent=True to suppress the output), e.g.:
>>> with elapsed_time(print=True):
... ...
...
Task terminated after X seconds.
For the location I think that the "time" module would be the first place where
I would look (since I would have to otherwise import time() from there). I
would probably also look at "timeit" (since I'm going to time something), even
though admittedly it doesn't fit too much with the rest. While it might fit
nicely in "contextlib", I won't probably expect to find it there unless I knew
it was there in the first place.
[0] would making timedelta a context manager be too crazy?
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<http://bugs.python.org/issue19495>
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