Chaining “is” operators

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Yes. Any operators classified as comparisons can be chained. From the language reference:

Formally, if a, b, c, …, y, z are expressions and op1, op2, …, opN
are comparison operators, then a op1 b op2 c ... y opN z is equivalent
to a op1 b and b op2 c and ... y opN z, except that each expression is
evaluated at most once.

The comparison operators are <, >, ==, >=, <=, <> (a little-used synonym for !=, gone in Python 3), !=, is, is not, in, and not in.

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