Transitioning from mesh.xml to mesh.xdmf, from dolfin-convert to meshio

mesh
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As referred to in the previous post:

The syntax has updated:

def create_mesh(mesh, cell_type, prune_z=False):
    cells = mesh.get_cells_type(cell_type)
    cell_data = mesh.get_cell_data("gmsh:physical", cell_type)
    points = mesh.points[:, :2] if prune_z else mesh.points
    out_mesh = meshio.Mesh(points=points, cells={cell_type: cells}, cell_data={
                           "name_to_read": [cell_data]})
    return out_mesh
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