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To: python-list@python.org
From: Terry Reedy <tjreedy@udel.edu>
Subject: Re: __setitem__ without position
Date: Thu, 11 Oct 2012 19:47:24 -0400
References: <CA+C4C6c7GBdxs+jZPGNrpauvZXP7caGpPb8Q466HD7mV09731Q@mail.gmail.com> <CA+C4C6eMKa6i4Vk4b7hc8SxyDyutoRKkP9VLt0g3UWs+v5ehTw@mail.gmail.com> <50773AE5.7020400@davea.name>
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On 10/11/2012 5:32 PM, Dave Angel wrote:

> Alternatively, you could call one of the other methods in the class.
> But since you gave us no clues, I'm shouldn't guess what it was called.
> But if I were to make such a class, I might use slicing:
>      C[:] = [57, 50, 59, 60]

In 3.x, you would write __setitem__ to recognize that the 'key' is a 
slice object rather than an int and act accordingly. (In 2.x, you would 
write __setslice__.) Actually, if you write

def __setitem__(self, key, value):
   self.somelist[key] = value

as you might have done already, you get slice getting, setting, and 
deleting for free. Try Dave's line in your code.

-- 
Terry Jan Reedy