code: def test_nested_item_tuple(self):
      assert self.scatter["marker.colorbar.title.font.family"] is None
      self.scatter[
          ("marker", "colorbar", "title.font", "family")
      ] = "courier"
      assert (
          self.scatter[("marker", "colorbar", "title.font", "family")]
          == "courier"
      )
      d1, d2 = strip_dict_params(self.scatter, self.expected_nested)
      assert d1 == d2
  
imports: from unittest import TestCase
  import plotly.graph_objs
  from plotly.tests.utils import strip_dict_params
label_desc: Use image node_id 7 for calling the TestAssignmentPrimitive obj's underlying member method code with example usage: obj.test_nested_item_tuple() without return types