Comparisons and singletons
Steven.Watanabe at autodesk.com
Fri Mar 24 21:40:15 CET 2006
PEP 8 says, "Comparisons to singletons like None should always be done
with 'is' or 'is not', never the equality operators." I know that "is"
is an identity operator, "==" and "!=" are the equality operators, but
I'm not sure what other singletons are being referred to here.
Also, I've seen code that does things like:
if foo is 3:
if foo is not '':
Are these valid uses of "is"?
Thanks in advance.
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