code: def __init__(
      self,
      graph=None,
      encoding="utf-8",
      prettyprint=True,
      version="1.2draft",
  ):
      self.construct_types()
      self.prettyprint = prettyprint
      self.encoding = encoding
      self.set_version(version)
      self.xml = Element(
          "gexf",
          {
              "xmlns": self.NS_GEXF,
              "xmlns:xsi": self.NS_XSI,
              "xsi:schemaLocation": self.SCHEMALOCATION,
              "version": self.VERSION,
          },
      )
  
      # Make meta element a non-graph element
      # Also add lastmodifieddate as attribute, not tag
      meta_element = Element("meta")
      subelement_text = f"NetworkX {nx.__version__}"
      SubElement(meta_element, "creator").text = subelement_text
      meta_element.set("lastmodifieddate", time.strftime("%Y-%m-%d"))
      self.xml.append(meta_element)
  
      register_namespace("viz", self.NS_VIZ)
  
      # counters for edge and attribute identifiers
      self.edge_id = itertools.count()
      self.attr_id = itertools.count()
      self.all_edge_ids = set()
      # default attributes are stored in dictionaries
      self.attr = {}
      self.attr["node"] = {}
      self.attr["edge"] = {}
      self.attr["node"]["dynamic"] = {}
      self.attr["node"]["static"] = {}
      self.attr["edge"]["dynamic"] = {}
      self.attr["edge"]["static"] = {}
  
      if graph is not None:
          self.add_graph(graph)
  
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 1 to create a new GEXFWriter object from inherited base classes: GEXF with example: obj = GEXFWriter(graph, encoding, prettyprint, version)