fix bug: cannot set property `default_mesh` of `DeepmdDataSystem` #10126

	on:
	push:
	pull_request:
	name: Test Python
	jobs:
	testpython:
	name: Test Python
	runs-on: ubuntu-22.04
	strategy:
	matrix:
	include:
	- python: 3.7
	tf: 1.14
	- python: 3.8
	tf:
	- python: "3.12"
	tf:

	steps:
	- uses: actions/checkout@v4
	- uses: actions/setup-python@v5
	with:
	python-version: ${{ matrix.python }}
	- uses: mpi4py/setup-mpi@v1
	if: ${{ matrix.tf == '' }}
	with:
	mpi: openmpi
	- run: curl -LsSf https://astral.sh/uv/install.sh \| sh
	- run: source/install/uv_with_retry.sh pip install --system -e .[cpu,test]
	env:
	# Please note that uv has some issues with finding
	# existing TensorFlow package. Currently, it uses
	# TensorFlow in the build dependency, but if it
	# changes, setting `TENSORFLOW_ROOT`.
	TENSORFLOW_VERSION: ${{ matrix.tf }}
	DP_BUILD_TESTING: 1
	- run: source/install/uv_with_retry.sh pip install --system --no-build-isolation horovod mpi4py
	if: ${{ matrix.tf == '' }}
	env:
	HOROVOD_WITH_TENSORFLOW: 1
	HOROVOD_WITHOUT_GLOO: 1
	- run: dp --version
	- run: pytest --cov=deepmd --cov=deepmd_utils source/tests --durations=0
	- uses: codecov/codecov-action@v4
	env:
	CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
	pass:
	name: Pass testing Python
	needs: [testpython]
	runs-on: ubuntu-latest
	if: always()
	steps:
	- name: Decide whether the needed jobs succeeded or failed
	uses: re-actors/alls-green@release/v1
	with:
	jobs: ${{ toJSON(needs) }}

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