vtk to gmesh's .msh

[WangYiKang0]

I am using meshio to read my vtk file, my vtk file contains 966 2D triangles 1544 3D tetrahedra, when I convert the vtk to gmesh's .msh file an error occurs, he lost the boundary labels that I defined in cell_data. When I try to assign the data from cell_data to gmsh:physical it reports an error that my array is inhomogeneous.
I used the code as follows
mesh = meshio.read('1.vtk')
mesh.cell_data['gmsh:physical'] =mesh.cell_data.pop('CellEntityIds')
meshio.write('test_mesh.msh', mesh, file_format='gmsh22')

[10427788]

Hi, While writing VTK for the given example problem in the Meshio script, it throws following error :

import meshio

two triangles and one quad

points = [
[0.0, 0.0],
[1.0, 0.0],
[0.0, 1.0],
[1.0, 1.0],
[2.0, 0.0],
[2.0, 1.0],
]
cells = [
("triangle", [[0, 1, 2], [1, 3, 2]]),
("quad", [[1, 4, 5, 3]]),
]

mesh = meshio.Mesh(
points,
cells,
# Optionally provide extra data on points, cells, etc.
point_data={"T": [0.3, -1.2, 0.5, 0.7, 0.0, -3.0]},
# Each item in cell data must match the cells array
cell_data={"a": [[0.1, 0.2], [0.4]]},
)
mesh.write(
"foo.vtk", # str, os.PathLike, or buffer/open file
# file_format="vtk", # optional if first argument is a path; inferred from extension
)

Alternative with the same options

meshio.write_points_cells("foo.vtk", points, cells)

AttributeError: 'Mesh' object has no attribute 'write'

Its is not writing VTK files and create attribute error