code: def test_property_assignment_nested_array(self):
      # Set parcoords dimension
      self.figure.data[2].dimensions[0].label = "dim 1"
      self.figure._send_restyle_msg.assert_called_once_with(
          {"dimensions.0.label": ["dim 1"]}, trace_indexes=2
      )
  
file_path: plotly.py/packages/python/plotly/plotly/tests/test_core/test_figure_messages/test_plotly_restyle.py
imports: import sys
  from unittest import TestCase
  import plotly.graph_objs
label_desc: Use image node_id 4 for calling the TestRestyleMessage obj's underlying member method code with example usage: obj.test_property_assignment_nested_array() without return types