New submission from Lukas Geiger <[email protected]>:
Lib uses loops to append to a new list in quite a few places. I think it would
be better to replace those with list comprehensions.
Benefits of this change:
- List comprehensions are generally more readable than appending to a newly
created list
- List comprehensions are also a lot faster.
Toy example:
In [1]: %%timeit
...: l = []
...: for i in range(5000):
...: l.append(i)
375 µs ± 1.73 µs per loop (mean ± std. dev. of 7 runs, 1000 loops each)
In [2]: %%timeit
...: l = [i for i in range(5000)]
168 µs ± 1.08 µs per loop (mean ± std. dev. of 7 runs, 10000 loops each)
Possible drawbacks:
- Refactoring can always introduce bugs and makes it harder to get meaningful
output from git blame. In this case I think the diff is very manageable, making
the changes easy to review.
Personally, I think the codebase would benefit from this change both in terms
of some small performance gains and maintainability. I'd be happy to make a PR
to fix this.
----------
components: Library (Lib)
messages: 335961
nosy: lgeiger
priority: normal
severity: normal
status: open
title: Replace append loops with list comprehensions
type: performance
versions: Python 3.8
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Python tracker <[email protected]>
<https://bugs.python.org/issue36039>
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