On Fri, Jan 23, 2009 at 6:49 PM, Steven D'Aprano < st...@remove-this-cybersource.com.au> wrote:
> On Fri, 23 Jan 2009 14:58:34 -0500, Gerald Britton wrote: > > > Hi -- Some time ago I ran across a comment recommending using <var> is > > None instead of <var> == None (also <var> is not None, etc.) > > That entirely depends on whether you wish to test for something which > *is* None or something with *equals* None. Those two things have > different meanings. > > I wonder, do newbies actually get the impression from somewhere that "is" > is a synonym for "=="? > I think it's more that teachers tell students without programming experience "always use == to test if something equals something else unless you're checking for None," without explaining what == and is actually mean.
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