code: def retrieve_lead(self, *guid, **options):
          cur_guid = guid or '' 
          params = {}
          for key in options:
              params[key] = options[key]
          
          lead = {'guid' : '-1'}
          """ wrap lead call so that it doesn't error out when not finding a lead """
          try:
              lead = self._call('lead/%s' % cur_guid, params, **options)
          except:
              """ no lead here """
          return lead
docs: Set guid to -1 as default for not finding a user