code: def __init__(self, axis=0):
      self.axis = axis
  
file_path: FATE/python/fate/ml/preprocessing/union.py
imports: import logging
  from fate.arch import Context
  from fate.arch.dataframe import DataFrame
  from ..abc.module import Module
label_desc: Use image node_id 1 to create a new Union object from inherited base classes: Module with example: obj = Union(axis)