Python: case _: adds a decision point #9

Each case_clause adds 1, including the wildcard case _:, which is the fall-through and not a decision. A two-way match scores higher than the equivalent if.

def classify_match(x):
    match x:
        case 0:
            return "zero"
        case _:
            return "other"


def classify_if(x):
    if x == 0:
        return "zero"
    return "other"

crapper --no-coverage src/demo/cc.py:

classify_match                 demo.cc                                3   N/A       N/A
classify_if                    demo.cc                                2   N/A       N/A

Expected: both 2. Counting an irrefutable case block (case _: or a bare capture such as case other:, see PEP 634) as the default branch would match how switch default is usually treated.

Environment: Linux x86_64, Python 3.11.13, tree-sitter 0.26.0, tree-sitter-language-pack 1.22.1, crapper 6fd92c4.