code: def test_nested_lists():
      s = pd.Series([[[1, 2, 3]], [1, 2], 1])
      result = s.explode()
      expected = pd.Series([[1, 2, 3], 1, 2, 1], index=[0, 1, 1, 2])
      tm.assert_series_equal(result, expected)
  
file_path: pandas/pandas/tests/series/methods/test_explode.py
imports: import numpy
  import pytest
  import pandas
  import pandas._testing
label_desc: Use image node_id 4 for calling a global function with example usage: test_nested_lists() without return types