code: def plotly_cdn_url(cdn_ver=get_plotlyjs_version()):
      """Return a valid plotly CDN url."""
      return "https://cdn.plot.ly/plotly-{cdn_ver}.min.js".format(
          cdn_ver=cdn_ver,
      )
  
imports: import plotly
  import plotly.graph_objs
  from plotly.offline import get_plotlyjs_version
label_desc: Use image node_id 3 for calling a global function with example usage: plotly_cdn_url(cdn_ver) and returns: str