anthony shaw <anthony.p.s...@gmail.com> added the comment:
> How about converting `[x for x in it]` to `[*it]` in AST?
I should have been more explicit, this patch improves the performance of all
list comprehensions that don’t have an if clause.
Not just
[x for x in y]
but:
d = {} # some sort of dictionary
[f”{k} — {v}” for k, v in d.items()]
a = iterable
[val**2 for val in a]
Would all use BUILD_LIST_PREALLOC and use a LengthHint.
I can do another speed test for those other scenarios.
Most of the stdlib packages have these sorts of list comps, including those in
the default site.py.
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nosy: -pablogsal
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<https://bugs.python.org/issue36551>
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