CODEWITHSUNDEEP
pythoncomparison-operators
Mark Ransom
Mark Ransom

Reputation: 308528

Is there a use for == or != in chained comparisons?

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?

Upvotes: 3

Views: 112

Answers (1)

user2357112
user2357112

Reputation: 282104

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.

Upvotes: 5

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