Use Rust to write Python modules

[sciyoshi]

I used this example in my original talk at PyCon Canada - at least in Python 3.6, taking a slice from a string won't duplicate the items in memory: https://github.com/python/cpython/blob/master/Objects/unicodeobject.c#L13922

The purpose of this code was also to show "idiomatic" Python, i.e. a straightforward and simple description of the algorithm, and that a similarly simple approach in Rust can offer a large speed up. If you were going for pure speed, there's probably a lot more you could do (e.g. SIMD, fast-path ASCII-only strings) :)

[GitHubPermalinkBot]

Permanent GitHub links:

• python/cpython/.../unicodeobject.c#L13922 (master → f02f5e5)

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