code: def portfolio_name(group_name, tag):
      """
      Return the name of the portfolio.
  
      Parameters
      ----------
      group_name : str
          The group represented in the portfolio.
      tag : str
          A unique identifier.
  
      Returns
      -------
      port_name : str
          Portfolio name.
  
      """
      port_name = ".".join([group_name, tag, "portfolio"])
      return port_name
  
imports: from alphapy.frame import Frame
  from alphapy.frame import frame_name
  from alphapy.frame import read_frame
  from alphapy.frame import write_frame
  from alphapy.globals import MULTIPLIERS, SSEP
  from alphapy.globals import Orders
  from alphapy.space import Space
  import logging
  import math
  import numpy
  from pandas import DataFrame
  from pandas import date_range
  from pandas import Series
label_desc: Use image node_id 1 for calling a global function with example usage: portfolio_name(group_name, tag) and returns: port_name