Function is_python2

src/python/pants/backend/python/rules/util.py:219–234

Checks if we should assume python2 code.

(
    compatibilities: Iterable[Optional[Iterable[str]]], python_setup: PythonSetup
)

def is_python2(
    compatibilities: Iterable[Optional[Iterable[str]]], python_setup: PythonSetup
) -> bool:
    """Checks if we should assume python2 code."""

    def iter_reqs():
        for compatibility in compatibilities:
            for constraint in python_setup.compatibility_or_constraints(compatibility):
                yield parse_interpreter_constraint(constraint)

    for req in iter_reqs():
        for python_27_ver in range(0, 18):  # The last python 2.7 version was 2.7.18.
            if req.specifier.contains(f"2.7.{python_27_ver}"):
                # At least one constraint limits us to Python 2, so assume that.
                return True
    return False