code: def add(self, data, name=None):
          ''' Appends a new column of data to the data source.
  
          Args:
              data (seq) : new data to add
              name (str, optional) : column name to use.
                  If not supplied, generate a name of the form "Series ####"
  
          Returns:
              str:  the column name used
  
          '''
          if name is None:
              n = len(self.data)
              while "Series %d"%n in self.data:
                  n += 1
              name = "Series %d"%n
          self.data[name] = data
          return namf add(self, data, name=None):
          ''' Appends a new column of data to the data source.
  
          Args:
              data (seq) : new data to add
              name (str, optional) : column name to use.
                  If not supplied, generate a name of the form "Series ####"
  
          Returns:
              str:  the column name used
  
          '''
          if name is None:
              n = len(self.data)
              while "Series %d"%n in self.data:
                  n += 1
              name = "Series %d"%n
          self.data[name] = data
          return name
docs: Appends a new column of data to the data source.
  
          Args:
              data (seq) : new data to add
              name (str, optional) : column name to use.
                  If not supplied, generate a name of the form "Series ####"
  
          Returns:
              str:  the column name used