Comparisons
Unlike C, all comparison and test operations in Python have the same priority, which is lower than that of any arithmetic, shifting or bitwise operation. Also unlike C, expressions like a < b < c have the interpretation that is conventional in mathematics.
Syntax:
expression operator expression
expression [ operator expression ]…
where operator is one of:
"<" | ">" | "==" | ">=" | "<=" | "<>" | "!=" | "is" ["not"] | ["not"] "in"`
Comparisons yield boolean values: True or False.
Comparisons can be chained arbitrarily, e.g., x < y <= z is equivalent to x < y and y < z, except that y is evaluated only once (but in both cases z is not evaluated at all when x < y is found to be false).
Formally, if a, b, c, ..., y, z are expressions and opa, opb, ..., opy