#10963: Axioms and more functorial constructions
-------------------------------------+-------------------------------------
Reporter: nthiery | Owner: stumpc5
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.2
Component: categories | Resolution:
Keywords: days54 | Merged in:
Authors: Nicolas M. Thiéry | Reviewers: Simon King, Frédéric
Report Upstream: N/A | Chapoton
Branch: | Work issues: To be merged
public/ticket/10963-doc- | simultaneously with #15801
distributive | Commit:
Dependencies: #11224, #8327, | 70e7b323cbdd928b9b05182e950bcdc90d2182bc
#10193, #12895, #14516, #14722, | Stopgaps:
#13589, #14471, #15069, #15094, |
#11688, #13394, #15150, #15506, |
#15757, #15759, #16244 |
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Comment (by tscrim):
If you really prefer the `if len(categories) == 0:`, then I won't revert
it again. However the `if not categories:` is 2x faster:
{{{
sage: p = []
sage: %timeit if p == []: pass
10000000 loops, best of 3: 197 ns per loop
sage: %timeit if not p: pass
10000000 loops, best of 3: 103 ns per loop
# This test is unfair since it is a machine int vs a Sage int
sage: %timeit if len(p) == 0: pass
1000000 loops, best of 3: 627 ns per loop
sage: a = int(0)
sage: %timeit if len(p) == a: pass
1000000 loops, best of 3: 255 ns per loop
sage: p = range(1000)
sage: %timeit if p == []: pass
10000000 loops, best of 3: 178 ns per loop
sage: %timeit if not p: pass
10000000 loops, best of 3: 90.6 ns per loop
sage: %timeit if len(p) == 0: pass # Again this is unfair
1000000 loops, best of 3: 616 ns per loop
sage: %timeit if len(p) == a: pass
1000000 loops, best of 3: 247 ns per loop
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/10963#comment:708>
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