def _is_parameterized_(self) -> bool:
        """Whether the object is parameterized by any Symbols that require
        resolution. Returns True if the object has any unresolved Symbols
        and False otherwise."""
Whether the object is parameterized by any Symbols that require
        resolution. Returns True if the object has any unresolved Symbols
        and False otherwise.
cirq-core/cirq/protocols/resolve_parameters.py