How to test a URL request in a "while True" loop

[Steve Holden]

Brian D wrote:
[...]
> I'm definitely acquiring some well-deserved schooling -- and it's
> really appreciated. I'd seen the "is/is not" preference before, but it
> just didn't stick.
> 
Yes, a lot of people have acquired the majority of their Python
education from this list - I have certainly learned a thing or two from
it over the years, and had some very interesting discussions.

is/is not are about object identity. Saying

  a is b

is pretty much the same thing as saying

  id(a) == id(b)

so it's a test that two expressions are references to the exact same
object. So it works with None, since there is only ever one value of
<type 'NoneType'>.

Be careful not to use it when there can be several different but equal
values, though.

> I see now that "pass" is redundant -- thanks for catching that.
> 
regards
 Steve
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