def is_gray(self):
        # Subclasses may overwrite this.
        return False
Tests JSendMixin.error
dataset/ETHPy150Open yhat/ggplot/ggplot/utils/color.py/Color.is_gray--crossover with--dataset/ETHPy150Open hfaran/Tornado-JSON/tests/test_tornado_json.py/TestJSendMixin.test_error