class_docstr: Reference an image via a URL
code: def get_url(self):
      if self.cache_file():
          return super(URLImage, self).get_url()
      return self.url
  
imports: import os
  from .....utilities.pathname import url2pathname
  from .._file_image import FileImage
label_desc: Use image node_id 2 for calling the URLImage obj's underlying member method code with example usage: obj.get_url() and returns: self, super