code: def set_version(self, version):
      d = self.versions.get(version)
      if d is None:
          raise nx.NetworkXError(f"Unknown GEXF version {version}.")
      self.NS_GEXF = d["NS_GEXF"]
      self.NS_VIZ = d["NS_VIZ"]
      self.NS_XSI = d["NS_XSI"]
      self.SCHEMALOCATION = d["SCHEMALOCATION"]
      self.VERSION = d["VERSION"]
      self.version = version
  
imports: import itertools
  import time
  from xml.etree.ElementTree import Element, ElementTree, SubElement, register_namespace, tostring
  import networkx
  from networkx.utils import open_file
label_desc: Use image node_id 2 for calling the GEXF obj's underlying member method code with example usage: obj.set_version(version) without return types