structural-pattern-matching

Capture makes remaining patterns unreachable

Cause of the problem A variable name in a case clause is treated as a name capture pattern. It always matches and tries to make an assignment to the variable name. This is almost certainly not what was intended. Because the first matching case wins and because case OKAY always matches, the other case clauses … Read more

How to use values stored in variables as case patterns?

If the constant you’re testing against is a dotted name, then it should be treated as a constant instead of as the name of the variable to put the capture in (see PEP 636 # Matching against constants and enums): class Codes: SUCCESS = 200 NOT_FOUND = 404 def handle(retcode): match retcode: case Codes.SUCCESS: print(‘success’) … Read more