code: def setup(self):
      mod = importlib.util.module_from_spec(
          importlib.machinery.ModuleSpec("pandas_dummy_backend", None)
      )
      mod.plot = lambda *args, **kwargs: 1
  
      with contextlib.ExitStack() as stack:
          stack.enter_context(
              mock.patch.dict(
                  sys.modules, {"pandas_dummy_backend": mod}
              )
          )
          tmp_path = pathlib.Path(
              stack.enter_context(tempfile.TemporaryDirectory())
          )
  
          sys.path.insert(0, os.fsdecode(tmp_path))
          stack.callback(sys.path.remove, os.fsdecode(tmp_path))
  
          dist_info = tmp_path / "my_backend-0.0.0.dist-info"
          dist_info.mkdir()
          (dist_info / "entry_points.txt").write_bytes(
              b"[pandas_plotting_backends]\n"
              b"my_ep_backend = pandas_dummy_backend\n"
              b"my_ep_backend0 = pandas_dummy_backend\n"
              b"my_ep_backend1 = pandas_dummy_backend\n"
              b"my_ep_backend2 = pandas_dummy_backend\n"
              b"my_ep_backend3 = pandas_dummy_backend\n"
              b"my_ep_backend4 = pandas_dummy_backend\n"
              b"my_ep_backend5 = pandas_dummy_backend\n"
              b"my_ep_backend6 = pandas_dummy_backend\n"
              b"my_ep_backend7 = pandas_dummy_backend\n"
              b"my_ep_backend8 = pandas_dummy_backend\n"
              b"my_ep_backend9 = pandas_dummy_backend\n"
          )
          self.stack = stack.pop_all()
  
imports: import contextlib
  import importlib.machinery
  import importlib.util
  import os
  import pathlib
  import sys
  import tempfile
  from unittest import mock
  import matplotlib
  import numpy
  from pandas import DataFrame, DatetimeIndex, Series, date_range
  from pandas.plotting._core import _get_plot_backend
  from .pandas_vb_common import setup
label_desc: Use image node_id 1 for calling the BackendLoading obj's underlying member method code with example usage: obj.setup() without return types