[Python-Dev] Set data type (addendum)

[Ka-Ping Yee]

On Thu, 3 Feb 2000, Ka-Ping Yee wrote:
> 
> In short, sets get
> 
>     append, extend, remove      # from lists
>     clear, copy                 # from dictionaries

I picked append() rather than insert() since list.insert()
takes two arguments, although you could also argue that
"insert" makes more sense since the item being added
doesn't "go at the end".

> and the operators
> 
>     &, |, in, <=, >=, <, >, ==

Oh!  I forgot one!  Of course, sets should also support "-":

    >>> s = {1, 2, 3, 4}
    >>> t = {2, 4, 5}
    >>> s - t
    {3, 1}

The "+" operator could do the same as "|".


-- ?!ng