Class CallableEntryPoint

pex/dist_metadata.py:1258–1281

@attr.s(frozen=True)
class CallableEntryPoint(object):
    module = attr.ib()  # type: str
    attrs = attr.ib()  # type: Tuple[str, ...]

    @attrs.validator
    def _validate_attrs(self, _, value):
        if not value:
            raise ValueError("A callable entry point must select a callable item from the module.")

    def resolve(self):
        # type: () -> Callable[[], Any]
        module = importlib.import_module(self.module)
        try:
            return cast("Callable[[], Any]", functools.reduce(getattr, self.attrs, module))
        except AttributeError as e:
            raise ImportError(
                "Could not resolve {attrs} in {module}: {err}".format(
                    attrs=".".join(self.attrs), module=module, err=e
                )
            )

    def __str__(self):
        # type: () -> str
        return "{module}:{attrs}".format(module=self.module, attrs=".".join(self.attrs))


def parse_entry_point(value):