On 1/12/21 11:27 PM, Chris Angelico wrote:
The language can also be defined in an optimization-friendly way, though. Consider how we got positional-only arguments in Python: first they existed in C-implemented functions in CPython, even though they couldn't exist in pure Python code, and then the functionality got added to the language definition, thus permitting the optimization.
I wouldn't describe positional-only parameters as an "optimization". They were created to add expressiveness to Python code, not to make Python code faster. The classic example is the dict constructor: technically, you couldn't implement it correctly in pure Python code, because it had a parameter (the iterable) that could not be a named parameter. Any name you gave it would preclude passing in that name as a name=value argument.
Parsing positional-only parameters is often faster than parsing named parameters, for obvious reasons. But this is really small stuff, drowned out by almost any other variation in your code.
Cheers, //arry/
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