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[mypyc] Add primitives for str.isalpha, isascii, isdecimal, isnumeric and isprintable - #22404
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… and isprintable These check whether every character of a string belongs to a character class. They share a macro that uses a fast path for ASCII strings and dispatches on the string kind otherwise. str.isascii() is O(1) and is implemented as an inline function. Part of mypyc/mypyc#644.
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Add primitives for
str.isalpha(),str.isascii(),str.isdecimal(),str.isnumeric()andstr.isprintable().These all check whether every character of a string belongs to a character class, so they share a macro that has a fast path for ASCII strings and dispatches on the string kind otherwise (similar to the existing
str.isdigit()primitive).str.isascii()is O(1) and is implemented as an inline function.Tests compare the results against CPython for every code point, and for a set of multi-character strings covering all string kinds.
Micro-benchmark (2M iterations over 10 short strings, compiled code, generic method call through
Anyvs the new primitive, Python 3.13):isalphaisasciiisdecimalisnumericisprintablePart of mypyc/mypyc#644.