如何使用numpy的“ where”功能？

Question

我有一个pandas数据框，并且我使用numpy函数比较两列，并根据该条件添加另一列，但是每次遇到语法错误时，我都会这样做。

signals = pd.DataFrame(index=df.index)
signals = df
signals['signal'] = 0.0
signals['signal'] = np.where((signals['close'] >= signals['upper'] & (signals['something'] >= 30) , -1, 0)
signals['signal'] = np.where((signals['close'] <= signals['lower'] & (signals['somthing'] >= 30) ,  1, 0)

File "<ipython-input-48-0eda6e639e76>", line 5
    signals['signal'] = np.where((signals['close'] <= signals['lower'] & (signals['something'] >= 30) ,  1, 0)
          ^
SyntaxError: invalid syntax