Left Right via Python-list schreef op 9/02/2024 om 17:09:
In order for the "splat" operator to work, the type of the object must populate slot `tp_as_mapping` with a struct of this type: https://docs.python.org/3/c-api/typeobj.html#c.PyMappingMethods and
have some non-null implementations of the methods this struct is
supposed to contain.
I can do this in C, but I cannot think of a way to do this in Python
proper.
Looks like it can simply be done in Python, no tp_as_mapping needed. I
tried it like Alan Bawden suggested (sibling post of yours):
import random # just as an example
import timeÿÿ # just as an example
from collections.abc import Mapping
class VirtualKwargs(Mapping):
ÿÿÿ def __init__(self):
ÿÿÿÿÿÿÿ self.fncs = {
ÿÿÿÿÿÿÿÿÿÿÿ # Simple examples of functions with varying return values to be
ÿÿÿÿÿÿÿÿÿÿÿ # called for each lookup, instead of fixed values.
ÿÿÿÿÿÿÿÿÿÿÿ 'time': time.time,
ÿÿÿÿÿÿÿÿÿÿÿ 'random': random.random,
ÿÿÿÿÿÿÿ }
ÿÿÿ def __len__(self):
ÿÿÿÿÿÿÿ return len(self.fncs)
ÿÿÿ def __iter__(self):
ÿÿÿÿÿÿÿ return iter(self.fncs)
ÿÿÿ def __getitem__(self, key):
ÿÿÿÿÿÿÿ return self.fncs[key]()
def func(**kwargs):
ÿÿÿ for k, v in kwargs.items():
ÿÿÿÿÿÿÿ print(f'{k}: {v}')
obj = VirtualKwargs()
func(**obj)
Output (obviously changes every run):
time: 1707497521.175763
random: 0.6765831287385126
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