13.09.17 23:07, Lucas Wiman пише:
On Wed, Sep 13, 2017 at 11:55 AM, Serhiy Storchaka
<[email protected]
<mailto:[email protected]>> wrote:
[...] Calling __getattr__() will slow down the access to builtins.
And there is a recursion problem if module's __getattr__() uses
builtins.
The first point is totally valid, but the recursion problem doesn't
seem like a strong argument. There are already lots of recursion
problems when defining custom __getattr__ or __getattribute__ methods,
but on balance they're a very useful part of the language.
In normal classes we have the recursion problem in __getattr__() only
with accessing instance attributes. Builtins (like isinstance, getattr,
AttributeError) can be used without problems. In module's __getattr__()
all this is a problem.
Module attribute access can be implicit. For example comparing a string
with a byte object in __getattr__() can trigger the lookup of
__warningregistry__ and the infinity recursion.
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