code: def opacity(self, val):
      self["opacity"] = val
  
file_path: catboost/contrib/python/plotly/py2/plotly/graph_objs/scattergl/selected/_marker.py
imports: from plotly.basedatatypes import BaseTraceHierarchyType
  import copy
label_desc: Use image node_id 4 for calling the Marker obj's underlying member method code with example usage: obj.opacity(val) without return types