code: def server(value=None):
          
          if value is None:
              return PyGraphistry._config['hostname']
  
          # setter
          shortcuts = {'dev': 'localhost:3000',
                       'staging': 'staging.graphistry.com',
                       'labs': 'labs.graphistry.com'}
          if value in shortcuts:
              resolved = shortcuts[value]
              PyGraphistry._config['hostname'] = resolved
              util.warn('Resolving alias %s to %s' % (value, resolved))
          else:
              PyGraphistry._config['hostname'] = value
docs: Get the hostname of the server or set the server using hostname or aliases.
          Supported aliases: 'localhost', 'staging', 'labs'.
          Also set via environment variable GRAPHISTRY_HOSTNAME.