match — Expert Examples

import dis

def match_example(x):
    match x:
        case 1:
            return "one"
        case [a, b]:
            return f"pair: {a}, {b}"
        case {"key": v}:
            return f"dict with key={v}"
        case _:
            return "other"

dis.dis(match_example)

# match compiles to a series of type checks and comparisons:
# - Literal patterns use COMPARE_OP
# - Sequence patterns check type + length
# - Mapping patterns check keys
# - Class patterns use isinstance + attribute access
# Each failed pattern jumps to the next case

print(f"\nTest: {match_example(1)}")
print(f"Test: {match_example([3, 4])}")
print(f"Test: {match_example({'key': 'val'})}")