code: def instance(self, format=None):
      return self.path("", format=format)
  
file_path: datasette/datasette/url_builder.py
imports: from .utils import tilde_encode, path_with_format, HASH_LENGTH, PrefixedUrlString
  import urllib
label_desc: Use image node_id 3 for calling the Urls obj's underlying member method code with example usage: obj.instance(format) and returns: self