PERF: optimize coordinate access for scalar Point

[jorisvandenbossche]

Illustration of what it would entail to optimize specifically the Point.x et al attributes for scalar points.

In [1]: import shapely

In [2]: p = shapely.Point(12, 34)

In [3]: %timeit p.x
3.15 µs ± 3.46 ns per loop (mean ± std. dev. of 7 runs, 100,000 loops each)    # <-- main
236 ns ± 0.164 ns per loop (mean ± std. dev. of 7 runs, 1,000,000 loops each)  # <-- PR

The reason this is so much faster is mostly from avoiding the ufunc machinery overhead.

While this is relatively little code for just those x/y/z attributes, the question is of course then "could we also speed up this other attribute .. ?", and we definitely don't want to end up reimplementing all ufuncs for scalar geometries.

[coveralls]

Pull Request Test Coverage Report for Build 8667674559

Details

• 2 of 2 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.3%) to 88.126%

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Totals
Change from base Build 8388286001:	0.3%
Covered Lines:	2620
Relevant Lines:	2973

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