

def _assert_take_fillable(self, values, indices, allow_fill=True, fill_value=None, na_value=np.nan):
    ' Internal method to handle NA filling of take '
    indices = com._ensure_platform_int(indices)
    if (allow_fill and (fill_value is not None)):
        if (indices < (- 1)).any():
            msg = 'When allow_fill=True and fill_value is not None, all indices must be >= -1'
            raise ValueError(msg)
        taken = values.take(indices)
        mask = (indices == (- 1))
        if mask.any():
            taken[taken] = na_value
    else:
        taken = values.take(indices)
    return taken

dataset/ETHPy150Open pydata/pandas/pandas/indexes/base.py Index._assert_take_fillable/VarMisuse@111/188 `mask`->`taken`