

def __radd__(self, other):
    if is_list_like(self):
        warnings.warn("using '+' to provide set union with Indexes is deprecated, use '|' or .union()", FutureWarning, stacklevel=2)
    return Index((other + np.array(self)))

dataset/ETHPy150Open pydata/pandas/pandas/indexes/base.py Index.__radd__/VarMisuse@15/20 `other`->`self`