code: def _loc(self, df_to, df_from):
      df_from.loc[np.nan] = np.nan
      return df_to.fillna(np.nan).apply(lambda x: df_from.loc[x])
  
imports: from pydantic import BaseModel
  from typing import Dict, List, Optional, Tuple, Union
  import abc
  import pandas
  import numpy
label_desc: Use image node_id 6 for calling the PandasOperand obj's underlying member method code with example usage: obj._loc(df_to, df_from) and returns: df_to