docs: def remove_columns(self, data, columns):
          """ This method removes columns in data
  
          :param data: original Pandas dataframe
          :param columns: list of columns to remove
          :type data: pandas.DataFrame
          :type columns: list of strings
  
          :returns: Pandas dataframe with removed columns
          :rtype: pandas.DataFrame
          """
  
          for column in columns:
              if column in data.columns:
                  data = data.drop(column, axis=1)
  
          return data