code: def test_construction_readout_format(self):
      slider = FloatSlider(readout_format="$.1f")
      assert slider.get_state()["readout_format"] == "$.1f"
  
file_path: catboost/contrib/python/ipywidgets/py3/ipywidgets/widgets/tests/test_widget_float.py
imports: from unittest import TestCase
  from traitlets import TraitError
  from ipywidgets import FloatSlider
label_desc: Use image node_id 2 for calling the TestFloatSlider obj's underlying member method code with example usage: obj.test_construction_readout_format() without return types