Steven D'Aprano <steve+pyt...@pearwood.info> added the comment:
I agree with Serhiy that using mutable defaults is not automatically a bad
idea. This is unnecessary code churn that fixes no bugs and adds no new
functionality and doesn't make the code "better".
The PR removes one harmless use of a mutable default but adds the "code smell"
that assumes that None is the only possible falsey value. This means that the
``__init__`` method will accept any falsey value without complaint:
Request(url, headers=0.0)
which is worse than the current code.
----------
nosy: +steven.daprano
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue38654>
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