If you try to compare a variable with a literal using is or is not you will get a syntax warning like this:
is
is not
>>> x=1 >>> x is 0 <stdin>:1: SyntaxWarning: "is" with a literal. Did you mean "=="? False >>> x is not 0 <stdin>:1: SyntaxWarning: "is not" with a literal. Did you mean "!="? True
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If you try to compare a variable with a literal using
isoris notyou will get a syntax warning like this: