code: def get_cell_format(column_dict, key=None):
      
      format = column_dict.get('format')
      prop = column_dict.get('__col__')
  
      if format is None and prop is not None:
          if hasattr(prop, 'columns'):
              sqla_column = prop.columns[0]
              column_type = getattr(sqla_column.type, 'impl', sqla_column.type)
              format = FORMAT_REGISTRY.get_item(column_type)
      return format
docs: Return the cell format for the given column
  
      :param column_dict: The column datas collected during inspection
      :param key: The exportation key