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Date: Thu, 30 Apr 2015 10:16:42 -0600
From: Carl Meyer <carl@oddbird.net>
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Subject: Re: mixing set and list operations
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Hi Tim,

On 04/30/2015 10:07 AM, Tim wrote:
> I noticed this today, using Python2.7 or 3.4, and wondered if it is imp=
lementation dependent:
>=20
> You can use 'extend' to add set elements to a list and use 'update' to =
add list elements to a set.
>=20
>>>> m =3D ['one', 'two']
>>>> p =3D set(['three', 'four'])
>>>> m.extend(p)
>>>> m
> ['one', 'two', 'four', 'three']
>=20
>>>> m =3D ['one', 'two']
>>>> p =3D set(['three', 'four'])
>>>> p.update(m)
>>>> p
> set(['four', 'three', 'two', 'one'])
>=20
>=20
> Useful if you don't care about ordering. Not sure if it's dangerous.

I don't think this is surprising, nor implementation dependent, nor
dangerous. Lists have an `extend()` method, sets have an `update()`
method. Both of these methods take any iterable as input, they don't
needlessly constrain the input to be of the same type as the base
object. That's the Pythonic way to do it; I'd be surprised if it didn't
work.

Carl


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