[issue33519] Should MutableSequence provide .copy()?
Raymond Hettinger
report at bugs.python.org
Tue May 15 19:35:15 EDT 2018
Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:
> Should we add .copy() to the ABC or remove the promise that all mutable sequences implement .copy()?
The second option would be best. Let's just clarify that copy() isn't part of the MutableSequence API.
The first option isn't really a choice be it would break existing uses that don't implement copy and because the ABC have a reliable way to create a new instance using the given abstract methods (it has no way of even knowing whether the data is stored locally, in a database, or updated through a REST API, it may not even be possible to reliably create an independent instance).
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