code: def create_network(cx_str, ndex_cred=None, private=True):
      
      username, password = get_default_ndex_cred(ndex_cred)
      nd = ndex2.client.Ndex2('http://public.ndexbio.org',
                              username=username,
                              password=password)
      cx_stream = io.BytesIO(cx_str.encode('utf-8'))
      try:
          logger.info('Uploading network to NDEx.')
          network_uri = nd.save_cx_stream_as_new_network(cx_stream)
      except Exception as e:
          logger.error('Could not upload network to NDEx.')
          logger.error(e)
          return
  
      network_id = network_uri.rsplit('/')[-1]
      if not private:
          nd.make_network_public(network_id)
      logger.info('The UUID for the uploaded network is: %s' % network_id)
      logger.info('View at: http://ndexbio.org/#/network/%s' % network_id)
      return network_id
docs: Creates a new NDEx network of the assembled CX model.
  
      To upload the assembled CX model to NDEx, you need to have
      a registered account on NDEx (http://ndexbio.org/) and have
      the `ndex` python package installed. The uploaded network
      is private by default.
  
      Parameters
      ----------
      ndex_cred : dict
          A dictionary with the following entries:
          'user': NDEx user name
          'password': NDEx password
  
      Returns
      -------
      network_id :  str
          The UUID of the NDEx network that was created by uploading
          the assembled CX model.