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 > implementation dependent: > > You can use 'extend' to add set elements to a list and use 'update' to add > list elements to a set. > >>>> m = ['one', 'two'] >>>> p = set(['three', 'four']) >>>> m.extend(p) >>>> m > ['one', 'two', 'four', 'three'] > >>>> m = ['one', 'two'] >>>> p = set(['three', 'four']) >>>> p.update(m) >>>> p > set(['four', 'three', 'two', 'one']) > > > 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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