code: def test_pandas_contiguous_dtypes():
      """2+ contiguous columns of the same dtype in the same DataFrame share the same
      surface thus have lower overhead
      """
      df1 = pd.DataFrame([[1, 2.2], [3, 4.4]])
      df2 = pd.DataFrame([[1.1, 2.2], [3.3, 4.4]])
      assert sizeof(df2) < sizeof(df1)
  
imports: from __future__ import annotations
  import os
  import sys
  from array import array
  import pytest
  from dask.multiprocessing import get_context
  from dask.sizeof import sizeof
  from dask.utils import funcname
label_desc: Use image node_id 8 for calling a global function with example usage: test_pandas_contiguous_dtypes() without return types