[Python-ideas] a set of enum.Enum values rather than the construction of bit-sets as the "norm"?

Guido van Rossum guido at python.org
Sun Dec 31 00:33:07 EST 2017

On Sat, Dec 30, 2017 at 8:50 PM, Franklin? Lee <
leewangzhong+python at gmail.com> wrote:
> Paddy might want something like this:
> - For existing APIs which take int or IntFlag flags, allow them to
> also take a set (or perhaps any collection) of flags.
> - In new APIs, take sets of Enum flags, and don't make them IntFlag.
> - Documentation should show preference toward using sets of Enum
> flags. Tutorials should pass sets.

I'm not keen on this recommendation. An argument that takes a Set[Foo]
would mean that in order to specify:
- no flags: you'd have to pass set() -- you can't use {} since that's an
empty dict, not an empty set
- one flag: you'd have to pass {Foo.BAR} rather than just Foo.BAR
- two flags: you'd have to pass {Foo.BAR, Foo.BAZ} rather than Foo.BAR |

I think for each of these the proposal would be strictly worse than the
current convention.

--Guido van Rossum (python.org/~guido)
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