code: def _implcairo():
      import matplotlib.backends.backend_qt5cairo  # noqa
      import sys
  
      assert "PyQt6" not in sys.modules
      assert "pyside6" not in sys.modules
      assert "PyQt5" in sys.modules or "pyside2" in sys.modules
  
imports: import functools
  import importlib
  import importlib.util
  import inspect
  import json
  import os
  import platform
  import signal
  import subprocess
  import sys
  import tempfile
  import time
  import urllib.request
  from PIL import Image
  import pytest
  import matplotlib
  from matplotlib import _c_internal_utils
  from matplotlib.backend_tools import ToolToggleBase
  from matplotlib.testing import subprocess_run_helper
label_desc: Use image node_id 12 for calling a global function with example usage: _implcairo() without return types