基于具有两个条件的另一列值创建新列并将NaN转换为空白

I have a minor issue with pandas code. I am using the np.where command to create a new column based on conditions and return either 1 or 0. However with np.where, the NaN values are returned as 0, but I would like to return them as blanks. If I understood correctly with np.where it is not straightforwardly possible. The x y z q is defined as the index. I can achieve this with the following:I have a minor issue with pandas code. I am usi