{"library":"meshio","title":"meshio","description":"meshio is a Python library for reading and writing various unstructured mesh formats, facilitating smooth conversion between them. It supports a wide array of formats including Abaqus, ANSYS msh, Gmsh, STL, VTK, XDMF, and many others. Currently at version 5.3.5, meshio is actively maintained with regular updates and requires Python 3.8 or newer. It can be used both as a command-line tool for conversions and as a Python API for programmatic mesh manipulation.","language":"python","status":"active","last_verified":"Sat May 16","install":{"commands":["pip install meshio","pip install meshio[all]"],"cli":{"name":"meshio","version":"meshio 5.3.5 [Python 3.11.15]"}},"imports":["import meshio"],"auth":{"required":false,"env_vars":[]},"quickstart":{"code":"import meshio\nimport numpy as np\n\n# Define points (vertices) of the mesh\npoints = [\n    [0.0, 0.0, 0.0],\n    [1.0, 0.0, 0.0],\n    [0.0, 1.0, 0.0],\n    [1.0, 1.0, 0.0],\n    [2.0, 0.0, 0.0],\n    [2.0, 1.0, 0.0],\n]\n\n# Define cells (elements) of the mesh, grouped by type\n# Here, two triangles and one quad\ncells = [\n    (\"triangle\", np.array([[0, 1, 2], [1, 3, 2]])),\n    (\"quad\", np.array([[1, 4, 5, 3]])),\n]\n\n# Create a Mesh object\nmesh = meshio.Mesh(\n    points,\n    cells,\n    # Optionally provide extra data on points, cells, etc.\n    point_data={\"T\": np.array([0.3, -1.2, 0.5, 0.7, 0.0, -3.0])},\n    # Each item in cell data must match the cells array structure\n    cell_data={\"a\": [np.array([0.1, 0.2]), np.array([0.4])]}\n)\n\n# Write the mesh to a file (format inferred from extension, or explicitly specified)\nmesh.write(\n    \"output.vtk\",\n    # file_format=\"vtk\", # optional, inferred from extension\n    binary=True # Write in binary format (e.g. for VTK)\n)\n\n# Read a mesh from a file\nread_mesh = meshio.read(\"output.vtk\")\n\nprint(f\"Read mesh points:\\n{read_mesh.points}\")\nprint(f\"Read mesh cells:\\n{read_mesh.cells}\")\nprint(f\"Read mesh point data (T):\\n{read_mesh.point_data['T']}\")\nprint(f\"Read mesh cell data (a):\\n{read_mesh.cell_data['a']}\")","lang":"python","description":"This quickstart demonstrates how to create a mesh from points and cells, add associated data (point data, cell data), write it to a VTK file, and then read it back. The `meshio.Mesh` constructor takes points, a list of cell blocks (type and indices), and optional point/cell/field data. The `mesh.write()` method saves the mesh, and `meshio.read()` loads it.","tag":null,"tag_description":null,"last_tested":null,"results":[]},"compatibility":{"tag":null,"tag_description":null,"last_tested":"2026-05-16","installed_version":"5.3.5","pypi_latest":"5.3.5","is_stale":false,"summary":{"python_range":"3.10–3.9","success_rate":75,"avg_install_s":5.1,"avg_import_s":0.57,"wheel_type":"wheel"},"results":[{"runtime":"python:3.10-alpine","python_version":"3.10","os_libc":"alpine (musl)","variant":"meshio","exit_code":0,"wheel_type":"wheel","failure_reason":null,"import_side_effects":"clean","install_time_s":null,"import_time_s":0.57,"mem_mb":13.4,"disk_size":"103.1M"},{"runtime":"python:3.10-alpine","python_version":"3.10","os_libc":"alpine 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