I came across this question:
Why does the expression 0 < 0 == 0 return False in Python?
The answers make perfect sense once you understand chained comparisons in Python.
Chained comparisons allow you to write something like 0 < x < 100 which is very convenient for testing to see if something is between 0 and 100. But is there a case where it would even make sense to use == or != on either side of that comparison? 0 < x == 100 is equivalent to x == 100 for example.
Were == and != included in the chaining syntax just so that they wouldn't have to be exceptions to the rule, or is there an actual use case?
The most common use case for chaining == is chaining it with itself. x == y == z is a simple way to test that three things are all equal.
Using != in a comparison chain is also occasionally useful, but it tends to be less clear. 0 < x != 10 is more concise than 0 < x and x != 10, but the two comparisons don't feel quite as much like one big comparison as x == y == z does, and x != y != z is usually a mistake.