On 1/11/21 6:34 PM, Paul Bryan wrote:
a.__annotations__ = o
assert a.__annotations__ == o
Would that assert fail? It depends on what type(o) is, which is
surprising.
Equally surprising?:
a.__co_annotations__ = o
a.__annotations__
assert a.__co_annotations__ == o
Well, since you asked, no. It's a good point, but I think my example is
a touch more "surprising". In my example, a.__annotations__ has two
different True values; in yours, a.__co_annotations__ goes from True to
False. It's acting more like a cache.
Also consider: if you set o.__annotations__ to a function, what if you
want to examine the function later? What if you want to examine the
function built by Python?
def enhance_annotations(co_annotations):
def enhance():
d = co_annotations()
d['extra'] = ...
return d
o.__co_annotations__ = enhance_annotations(o.__co_annotations__)
Finally, it's just a code smell to have one attribute support such a
bewildering variety of types. Of course, this /works,/ but it's bad
hygiene to store such violently different types in what is ostensibly
the same attribute.
Cheers,
//arry/
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