code: def test_pop_valid_simple_prop(self):
      self.assertEqual(self.layout.width, 1000)
      self.assertEqual(self.layout.pop("width"), 1000)
      self.assertIsNone(self.layout.width)
  
file_path: plotly.py/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_graph_objs.py
imports: from unittest import TestCase
  import plotly.graph_objs
label_desc: Use image node_id 2 for calling the TestPop obj's underlying member method code with example usage: obj.test_pop_valid_simple_prop() without return types