code: def get_vrf(arg = None, default_var = 'default_vrf_rt', abort = False):
      
  
      # yep, global variables are evil
      global vrf
  
      # if there is a VRF set, return it
      if vrf is not None:
          return vrf
  
      if arg is None:
          # fetch default vrf
          try:
              vrf_rt = cfg.get('global', default_var)
          except configparser.NoOptionError:
              # default to all VRFs
              vrf_rt = 'all'
      else:
          vrf_rt = arg
  
      if vrf_rt.lower() == 'all':
          vrf = VRF()
          vrf.rt = 'all'
      else:
          if vrf_rt.lower() in ('-', 'none'):
              vrf_rt = None
  
          try:
              vrf = VRF.search({ 'val1': 'rt',
                  'operator': 'equals',
                  'val2': vrf_rt
                  })['result'][0]
          except (KeyError, IndexError):
              if abort:
                  print("VRF with [RT: %s] not found." % str(vrf_rt), file=sys.stderr)
                  sys.exit(1)
              else:
                  vrf = False
  
      return vrf
docs: Returns VRF to work in
  
          Returns a pynipap.VRF object representing the VRF we are working
          in. If there is a VRF set globally, return this. If not, fetch the
          VRF named 'arg'. If 'arg' is None, fetch the default_vrf
          attribute from the config file and return this VRF.