def __init__(self):
    """
    Constructor.
    """
    self.availableFields = \
        {'vertex': \
           {'info': ["vertex info"],
            'data': ["vertex data 1",
                     "vertex data 2"]},
         'cell': \
           {'info': ["cell info"],
            'data': ["cell data"]}}

    filename = "data/twohex8.txt"
    
    from pylith.meshio.MeshIOAscii import MeshIOAscii
    iohandler = MeshIOAscii()
    iohandler.inventory.filename = filename
    from spatialdata.geocoords.CSCart import CSCart
    iohandler.inventory.coordsys = CSCart()
    iohandler._configure()

    from spatialdata.units.Nondimensional import Nondimensional
    normalizer = Nondimensional()
    normalizer._configure()
    mesh = iohandler.read(debug=False, interpolate=False)

    from pylith.topology.Fields import Fields
    fields = Fields(mesh)
    
    self.mesh = mesh
    self.fields = fields
    return

    def setUp(self):
        """
    Setup mesh and associated field.
    """
        from spatialdata.geocoords.CSCart import CSCart

        cs = CSCart()
        cs.inventory.spaceDim = 2
        cs._configure()

        from spatialdata.units.Nondimensional import Nondimensional

        normalizer = Nondimensional()
        normalizer._configure()

        from pylith.meshio.MeshIOAscii import MeshIOAscii

        importer = MeshIOAscii()
        importer.inventory.filename = "data/tri3.mesh"
        importer.inventory.coordsys = cs
        importer._configure()
        self.mesh = importer.read(debug=False, interpolate=False)

        self.field = Field(self.mesh)
        self.field.allocate()
        return

  def _runTest(self, filenameIn, filenameOut, filenameOutE, faultGroup=None):

    from spatialdata.geocoords.CSCart import CSCart
    cs = CSCart()
    cs._configure()

    from pylith.meshio.MeshIOAscii import MeshIOAscii
    io = MeshIOAscii()
    io.inventory.filename = filenameIn
    io.inventory.coordsys = cs
    io._configure()
    
    mesh = io.read(debug=False, interpolate=True)

    if not faultGroup is None:
      from pylith.faults.FaultCohesiveKin import FaultCohesiveKin
      fault = FaultCohesiveKin()
      fault.inventory.matId = 10
      fault.inventory.faultLabel = faultGroup
      fault._configure()

      nvertices = fault.numVerticesNoMesh(mesh)
      firstFaultVertex = 0
      firstLagrangeVertex = nvertices
      firstFaultCell      = 2*nvertices
      fault.adjustTopology(mesh, 
                           firstFaultVertex, 
                           firstLagrangeVertex,
                           firstFaultCell)

    from pylith.topology.RefineUniform import RefineUniform
    refiner = RefineUniform()
    meshRefined = refiner.refine(mesh)

    return

  def setUp(self):
    from pylith.meshio.MeshIOAscii import MeshIOAscii
    iohandler = MeshIOAscii()
    filename = "data/twohex8.txt"
    
    from spatialdata.units.Nondimensional import Nondimensional
    normalizer = Nondimensional()
    normalizer._configure()

    from spatialdata.geocoords.CSCart import CSCart
    iohandler.inventory.filename = filename
    iohandler.inventory.coordsys = CSCart()
    iohandler._configure()
    mesh = iohandler.read(debug=False, interpolate=False)

    from pylith.topology.SolutionFields import SolutionFields
    fields = SolutionFields(mesh)

    name = "disp(t)"
    fields.add(name, "displacement")
    fields.solutionName(name)
    field = fields.get(name)
    field.subfieldAdd("displacement", mesh.dimension(), field.VECTOR)
    field.subfieldsSetup()
    field.newSection(field.VERTICES_FIELD, mesh.dimension())
    field.allocate()

    self.mesh = mesh
    self.fields = fields
    self.normalizer = normalizer
    return

  def setUp(self):
    """
    Setup mesh and associated field.
    """
    from spatialdata.geocoords.CSCart import CSCart
    cs = CSCart()
    cs.inventory.spaceDim = 2
    cs._configure()

    from spatialdata.units.Nondimensional import Nondimensional
    normalizer = Nondimensional()
    normalizer._configure()    

    from pylith.meshio.MeshIOAscii import MeshIOAscii
    importer = MeshIOAscii()
    importer.inventory.filename = "data/tri3.mesh"
    importer.inventory.coordsys = cs
    importer._configure()
    self.mesh = importer.read(debug=False, interpolate=False)

    from pylith.topology.SolutionFields import SolutionFields
    fields = SolutionFields(self.mesh)
    fields.add("disp t+dt", "displacement")
    fields.solutionName("disp t+dt")
    solution = fields.solution()
    solution.newSection(solution.VERTICES_FIELD, self.mesh.dimension())
    solution.allocate()
    solution.zero()

    self.fields = fields
    self.jacobian = Jacobian(solution)
    return

  def _preinitialize(self):
    """
    Setup mesh and integrator and preinitialize integrator.
    """
    from spatialdata.units.Nondimensional import Nondimensional
    normalizer = Nondimensional()
    normalizer._configure()

    # Setup mesh
    cs = CSCart()
    cs.inventory.spaceDim = 2
    cs._configure()
    from pylith.meshio.MeshIOAscii import MeshIOAscii
    importer = MeshIOAscii()
    importer.inventory.filename = "data/tri3.mesh"
    importer.inventory.coordsys = cs
    importer._configure()
    mesh = importer.read(debug=False, interpolate=False)

    # Setup material
    from pylith.feassemble.FIATSimplex import FIATSimplex
    cell = FIATSimplex()
    cell.inventory.dimension = 2
    cell.inventory.degree = 1
    cell.inventory.order = 1
    cell._configure()
    from pylith.feassemble.Quadrature import Quadrature
    quadrature = Quadrature()
    quadrature.inventory.cell = cell
    quadrature._configure()
    
    from spatialdata.spatialdb.SimpleDB import SimpleDB
    from spatialdata.spatialdb.SimpleIOAscii import SimpleIOAscii
    iohandler = SimpleIOAscii()
    iohandler.inventory.filename = "data/elasticplanestrain.spatialdb"
    iohandler._configure()
    db = SimpleDB()
    db.inventory.label = "elastic plane strain"
    db.inventory.iohandler = iohandler
    db._configure()

    from pylith.materials.ElasticPlaneStrain import ElasticPlaneStrain
    material = ElasticPlaneStrain()
    material.inventory.label = "elastic plane strain"
    material.inventory.id = 0
    material.inventory.dbProperties = db
    material.inventory.quadrature = quadrature
    material._configure()
    
    from pylith.meshio.OutputMatElastic import OutputMatElastic
    material.output = OutputMatElastic()
    material.output._configure()
    material.output.writer._configure()

    # Setup integrator
    integrator = ElasticityImplicitLgDeform()
    integrator.preinitialize(mesh, material)
    return (mesh, integrator)

  def test_preinitialize(self):
    """
    Test preinitialize().

    WARNING: This is not a rigorous test of initialize() because we
    don't verify the results.
    """
    from pylith.feassemble.FIATSimplex import FIATSimplex
    cell = FIATSimplex()
    cell.inventory.dimension = 2
    cell.inventory.order = 1
    cell.inventory.degree = 1
    cell._configure()

    from pylith.feassemble.Quadrature import Quadrature
    quadrature = Quadrature()
    quadrature.inventory.cell = cell
    quadrature.inventory.minJacobian = 1.0e-4
    quadrature._configure()

    from spatialdata.spatialdb.SimpleDB import SimpleDB
    from spatialdata.spatialdb.SimpleIOAscii import SimpleIOAscii
    iohandler = SimpleIOAscii()
    iohandler.inventory.filename = "data/matinitialize.spatialdb"
    iohandler._configure()
    db = SimpleDB()
    db.inventory.label = "material properties"
    db.inventory.iohandler = iohandler
    db._configure()

    from pylith.materials.ElasticPlaneStrain import ElasticPlaneStrain
    material = ElasticPlaneStrain()
    material.inventory.quadrature = quadrature
    material.inventory.dbProperties = db
    material.inventory.label = "my material"
    material.inventory.id = 54
    material._configure()

    from spatialdata.geocoords.CSCart import CSCart
    cs = CSCart()
    cs.inventory.spaceDim = 2
    cs._configure()

    from spatialdata.units.Nondimensional import Nondimensional
    normalizer = Nondimensional()
    normalizer._configure()

    from pylith.meshio.MeshIOAscii import MeshIOAscii
    importer = MeshIOAscii()
    importer.inventory.filename = "data/twoelems.mesh"
    importer.inventory.coordsys = cs
    importer._configure()
    mesh = importer.read(debug=False, interpolate=False)
    
    material.preinitialize(mesh)

    # No test of result.
    return

  def test_filename(self):
    """
    Test filename().
    """
    value = "hi.txt"

    io = MeshIOAscii()
    io.filename(value)
    self.assertEqual(value, io.filename())
    return

  def _initialize(self):
    """
    Initialize DirichletBoundary boundary condition.
    """
    from spatialdata.geocoords.CSCart import CSCart
    cs = CSCart()
    cs.inventory.spaceDim = 2
    cs._configure()

    from spatialdata.units.Nondimensional import Nondimensional
    normalizer = Nondimensional()
    normalizer._configure()

    from pylith.meshio.MeshIOAscii import MeshIOAscii
    importer = MeshIOAscii()
    importer.inventory.filename = "data/tri3.mesh"
    importer.inventory.coordsys = cs
    importer._configure()
    mesh = importer.read(debug=False, interpolate=False)
    
    from spatialdata.spatialdb.SimpleDB import SimpleDB
    db = SimpleDB()
    db.inventory.label = "TestDirichletBoundary tri3"
    db.inventory.iohandler.inventory.filename = "data/tri3_disp.spatialdb"
    db.inventory.iohandler._configure()
    db._configure()

    from spatialdata.spatialdb.SimpleDB import SimpleDB
    dbRate = SimpleDB()
    dbRate.inventory.label = "TestDirichletBoundary tri3"
    dbRate.inventory.iohandler.inventory.filename = "data/tri3_vel.spatialdb"
    dbRate.inventory.iohandler._configure()
    dbRate._configure()

    from pylith.bc.DirichletBoundary import DirichletBoundary
    bc = DirichletBoundary()
    bc.inventory.output._configure()
    bc.inventory.output.writer._configure()
    bc.inventory.label = "bc"
    bc.inventory.bcDOF = [1]
    bc.inventory.dbInitial = db
    bc.inventory.dbRate = dbRate
    bc._configure()

    bc.preinitialize(mesh)
    bc.initialize(totalTime=0.0, numTimeSteps=1, normalizer=normalizer)

    # Setup field
    from pylith.topology.Field import Field
    field = Field(mesh)
    field.newSection(field.VERTICES_FIELD, cs.spaceDim())
    
    return (mesh, bc, field)

  def test_readwrite(self):
    """
    Test write() and read().
    """
    filenameIn = "data/mesh2Din3D.txt"
    filenameOut = "data/mesh2Din3D_test.txt"

    from spatialdata.geocoords.CSCart import CSCart
    cs = CSCart()
    cs._configure()

    io = MeshIOAscii()
    io.inventory.filename = filenameIn
    io.inventory.coordsys = cs
    io._configure()
    
    from spatialdata.units.Nondimensional import Nondimensional
    normalizer = Nondimensional()

    mesh = io.read(debug=False, interpolate=True)

    io.filename(filenameOut)
    io.write(mesh)

    fileE = open(filenameIn, "r")
    linesE = fileE.readlines()
    fileE.close()
    fileT = open(filenameOut, "r")
    linesT = fileT.readlines()
    fileT.close()

    self.assertEqual(len(linesE), len(linesT))
    for (lineE, lineT) in zip(linesE, linesT):
      self.assertEqual(lineE, lineT)
    return

  def _getMesh(self):
    """
    Get mesh from file.
    """
    from spatialdata.geocoords.CSCart import CSCart
    cs = CSCart()
    cs.inventory.spaceDim = 2
    cs._configure()

    from spatialdata.units.Nondimensional import Nondimensional
    normalizer = Nondimensional()
    normalizer._configure()    

    from pylith.meshio.MeshIOAscii import MeshIOAscii
    importer = MeshIOAscii()
    importer.inventory.filename = "data/tri3.mesh"
    importer.inventory.coordsys = cs
    importer._configure()
    mesh = importer.read(debug=False, interpolate=False)
    
    return mesh

  def test_adjustTopology(self):
    """
    Test adjustTopology().

    WARNING: This is not a rigorous test of adjustTopology() because we
    neither set the input fields or verify the results.
    """
    cs = CSCart()
    cs.inventory.spaceDim = 2
    cs._configure()
    
    from spatialdata.units.Nondimensional import Nondimensional
    normalizer = Nondimensional()
    normalizer._configure()

    from pylith.meshio.MeshIOAscii import MeshIOAscii
    importer = MeshIOAscii()
    importer.inventory.filename = "data/tri3.mesh"
    importer.inventory.coordsys = cs
    importer._configure()
    mesh = importer.read(debug=False, interpolate=False)

    fault = FaultCohesiveKin()
    fault.inventory.matId = 10
    fault.inventory.faultLabel = "fault"
    fault.inventory.faultEdge = "fault_edge"
    fault._configure()

    nvertices = fault.numVerticesNoMesh(mesh)
    firstFaultVertex = 0
    firstLagrangeVertex = nvertices
    firstFaultCell      = 2*nvertices
    fault.adjustTopology(mesh, firstFaultVertex, firstLagrangeVertex,
                         firstFaultCell)

    # We should really add something here to check to make sure things
    # actually initialized correctly    
    return

    def test_readwrite(self):
        """
    Test read().
    """
        filenameIn = "data/twohex8.exo"
        filenameOut = "data/twohex8_test.txt"
        filenameE = "data/twohex8.txt"

        from spatialdata.geocoords.CSCart import CSCart

        cs = CSCart()
        cs._configure()

        # For now, we only test reading the file.
        io = MeshIOCubit()
        io.inventory.filename = filenameIn
        io.inventory.useNames = False
        io._configure()

        from spatialdata.units.Nondimensional import Nondimensional

        normalizer = Nondimensional()

        mesh = io.read(debug=False, interpolate=False)

        testhandler = MeshIOAscii()
        testhandler.filename(filenameOut)
        testhandler.coordsys = cs
        testhandler.write(mesh)

        fileE = open(filenameE, "r")
        linesE = fileE.readlines()
        fileE.close()
        fileT = open(filenameOut, "r")
        linesT = fileT.readlines()
        fileT.close()

        self.assertEqual(len(linesE), len(linesT))
        for (lineE, lineT) in zip(linesE, linesT):
            self.assertEqual(lineE, lineT)
        return

  def test_readwrite(self):
    """
    Test read().
    """
    filenameGmvIn = "data/cube2_ascii.gmv"
    filenamePsetIn = "data/cube2_ascii.pset"
    filenameOut = "data/cube2_test.txt"
    filenameE = "data/cube2.txt"

    from spatialdata.geocoords.CSCart import CSCart
    cs = CSCart()
    cs._configure()

    # For now, we only test reading the file. We would like to write
    # the file and compare against the original.
    io = MeshIOLagrit()
    io.inventory.filenameGmv = filenameGmvIn
    io.inventory.filenamePset = filenamePsetIn
    io._configure()

    from spatialdata.units.Nondimensional import Nondimensional
    normalizer = Nondimensional()

    mesh = io.read(debug=False, interpolate=True)

    testhandler = MeshIOAscii()
    testhandler.filename(filenameOut)
    testhandler.coordsys = cs
    testhandler.write(mesh)

    fileE = open(filenameE, "r")
    linesE = fileE.readlines()
    fileE.close()
    fileT = open(filenameOut, "r")
    linesT = fileT.readlines()
    fileT.close()

    self.assertEqual(len(linesE), len(linesT))
    for (lineE, lineT) in zip(linesE, linesT):
      self.assertEqual(lineE, lineT)
    return

  def _initialize(self):
    """
    Initialize AbsorbingDampers boundary condition.
    """
    from spatialdata.spatialdb.SimpleDB import SimpleDB
    db = SimpleDB()
    db.inventory.label = "TestAbsorbingDampers tri3"
    db.inventory.iohandler.inventory.filename = \
        "data/elasticplanestrain.spatialdb"
    db.inventory.iohandler._configure()
    db._configure()

    from pylith.feassemble.FIATSimplex import FIATSimplex
    cell = FIATSimplex()
    cell.inventory.dimension = 1
    cell.inventory.degree = 1
    cell.inventory.order = 1
    cell._configure()
    from pylith.feassemble.Quadrature import Quadrature
    quadrature = Quadrature()
    quadrature.inventory.cell = cell
    quadrature._configure()

    from pylith.bc.AbsorbingDampers import AbsorbingDampers
    bc = AbsorbingDampers()
    bc.inventory.quadrature = quadrature
    bc.inventory.db = db
    bc.inventory.id = 0
    bc.inventory.label = "bc"
    bc._configure()

    from spatialdata.geocoords.CSCart import CSCart
    cs = CSCart()
    cs.inventory.spaceDim = 2
    cs._configure()

    from spatialdata.units.Nondimensional import Nondimensional
    normalizer = Nondimensional()
    normalizer._configure()

    from pylith.meshio.MeshIOAscii import MeshIOAscii
    importer = MeshIOAscii()
    importer.inventory.filename = "data/tri3.mesh"
    importer.inventory.coordsys = cs
    importer._configure()
    mesh = importer.read(debug=False, interpolate=False)
    
    bc.preinitialize(mesh)
    bc.initialize(totalTime=0.0, numTimeSteps=1, normalizer=normalizer)
    bc.timeStep(0.01)

    # Setup fields
    from pylith.topology.SolutionFields import SolutionFields
    fields = SolutionFields(mesh)
    fields.add("residual", "residual")
    fields.add("dispIncr(t->t+dt)", "displacement")
    fields.add("disp(t)", "displacement")
    fields.add("disp(t-dt)", "displacement")
    fields.add("velocity(t)", "velocity")
    fields.solutionName("dispIncr(t->t+dt)")

    residual = fields.get("residual")
    residual.newSection(residual.VERTICES_FIELD, cs.spaceDim())
    residual.allocate()
    residual.zero()

    fields.copyLayout("residual")
    
    return (mesh, bc, fields)

  def _initialize(self):
    """
    Initialize fault.
    """
    dt = 2.4
    
    from spatialdata.units.Nondimensional import Nondimensional
    normalizer = Nondimensional()
    normalizer._configure()

    # Setup mesh
    cs = CSCart()
    cs.inventory.spaceDim = 2
    cs._configure()

    from pylith.meshio.MeshIOAscii import MeshIOAscii
    importer = MeshIOAscii()
    importer.inventory.filename = "data/tri3.mesh"
    importer.inventory.coordsys = cs
    importer._configure()
    mesh = importer.read(debug=False, interpolate=False)

    # Setup quadrature
    from pylith.feassemble.FIATSimplex import FIATSimplex
    cell = FIATSimplex()
    cell.inventory.dimension = 1
    cell.inventory.degree = 1
    cell.inventory.order = 1
    cell._configure()
    from pylith.feassemble.Quadrature import Quadrature
    quadrature = Quadrature()
    quadrature.inventory.cell = cell
    quadrature._configure()

    # Setup rupture info
    from spatialdata.spatialdb.SimpleDB import SimpleDB
    from spatialdata.spatialdb.SimpleIOAscii import SimpleIOAscii
    ioTractions = SimpleIOAscii()
    ioTractions.inventory.filename = "data/tri3_initialtractions.spatialdb"
    ioTractions._configure()
    dbTractions = SimpleDB()
    dbTractions.inventory.iohandler = ioTractions
    dbTractions.inventory.label = "initial tractions"
    dbTractions._configure()
    from pylith.faults.TractPerturbation import TractPerturbation
    tract = TractPerturbation()
    tract.inventory.dbInitial = dbTractions
    tract._configure()

    ioFriction = SimpleIOAscii()
    ioFriction.inventory.filename = "data/tri3_staticfriction.spatialdb"
    ioFriction._configure()
    dbFriction = SimpleDB()
    dbFriction.inventory.iohandler = ioFriction
    dbFriction.inventory.label = "friction"
    dbFriction._configure()
    
    from pylith.friction.StaticFriction import StaticFriction
    friction = StaticFriction()
    friction.inventory.label = "Static friction"
    friction.inventory.dbProperties = dbFriction
    friction._configure()

    # Setup fault
    fault = FaultCohesiveDyn()
    fault.inventory.output.inventory.writer._configure()
    fault.inventory.output._configure()
    fault.inventory.matId = 10
    fault.inventory.faultLabel = "fault"
    fault.inventory.upDir = [0, 0, 1]
    fault.inventory.faultQuadrature = quadrature
    fault.inventory.tract = tract
    fault.inventory.friction = friction
    fault._configure()

    nvertices = fault.numVerticesNoMesh(mesh)
    firstFaultVertex = 0
    firstLagrangeVertex = nvertices
    firstFaultCell      = 2*nvertices
    fault.adjustTopology(mesh, firstFaultVertex, firstLagrangeVertex,
                         firstFaultCell)
    from pylith.topology.topology import MeshOps_nondimensionalize
    MeshOps_nondimensionalize(mesh, normalizer)

    fault.preinitialize(mesh)
    fault.timeStep(dt)
    fault.verifyConfiguration()
    from pyre.units.time import s
    fault.initialize(totalTime=0.0*s, numTimeSteps=1, normalizer=normalizer)

    # Setup fields
    from pylith.topology.SolutionFields import SolutionFields
    fields = SolutionFields(mesh)
    fields.add("residual", "residual")
    fields.add("dispIncr(t->t+dt)", "displacement_increment")
    fields.add("disp(t)", "displacement")
    fields.add("velocity(t)", "velocity")
    fields.solutionName("dispIncr(t->t+dt)")

    residual = fields.get("residual")
#.........这里部分代码省略.........

  def _initialize(self):
    """
    Initialize fault.
    """
    dt = 2.4
    
    from spatialdata.units.Nondimensional import Nondimensional
    normalizer = Nondimensional()
    normalizer._configure()

    # Setup mesh
    cs = CSCart()
    cs.inventory.spaceDim = 2
    cs._configure()

    from pylith.meshio.MeshIOAscii import MeshIOAscii
    importer = MeshIOAscii()
    importer.inventory.filename = "data/tri3.mesh"
    importer.inventory.coordsys = cs
    importer._configure()
    mesh = importer.read(debug=False, interpolate=False)

    # Setup quadrature
    from pylith.feassemble.FIATSimplex import FIATSimplex
    cell = FIATSimplex()
    cell.inventory.dimension = 1
    cell.inventory.degree = 1
    cell.inventory.order = 1
    cell._configure()
    from pylith.feassemble.Quadrature import Quadrature
    quadrature = Quadrature()
    quadrature.inventory.cell = cell
    quadrature._configure()

    # Setup impulses
    from spatialdata.spatialdb.SimpleDB import SimpleDB
    from spatialdata.spatialdb.SimpleIOAscii import SimpleIOAscii
    ioImpulseAmp = SimpleIOAscii()
    ioImpulseAmp.inventory.filename = "data/tri3_impulses.spatialdb"
    ioImpulseAmp._configure()
    dbImpulseAmp = SimpleDB()
    dbImpulseAmp.inventory.iohandler = ioImpulseAmp
    dbImpulseAmp.inventory.label = "impulse amplitude"
    dbImpulseAmp._configure()
    
    # Setup fault
    fault = FaultCohesiveImpulses()
    fault.inventory.output.inventory.writer._configure()
    fault.inventory.output._configure()
    fault.inventory.matId = 10
    fault.inventory.faultLabel = "fault"
    fault.inventory.upDir = [0, 0, 1]
    fault.inventory.faultQuadrature = quadrature
    fault.inventory.dbImpulseAmp = dbImpulseAmp
    fault._configure()

    nvertices = fault.numVerticesNoMesh(mesh)
    firstFaultVertex = 0
    firstLagrangeVertex = nvertices
    firstFaultCell      = 2*nvertices
    fault.adjustTopology(mesh, firstFaultVertex, firstLagrangeVertex,
                         firstFaultCell)
    fault.preinitialize(mesh)
    fault.timeStep(dt)
    fault.verifyConfiguration()
    from pyre.units.time import s
    fault.initialize(totalTime=0.0*s, numTimeSteps=1, normalizer=normalizer)

    # Setup fields
    from pylith.topology.SolutionFields import SolutionFields
    fields = SolutionFields(mesh)
    fields.add("residual", "residual")
    fields.add("dispIncr(t->t+dt)", "displacement_increment")
    fields.add("disp(t)", "displacement")
    fields.solutionName("dispIncr(t->t+dt)")
    residual = fields.get("residual")
    residual.newSection(residual.VERTICES_FIELD, cs.spaceDim())
    residual.allocate()
    residual.zero()
    fields.copyLayout("residual")
    
    return (mesh, fault, fields)

if len(sys.argv) != 2:
    raise ValueError("usage: exotoascii.py EXODUS_MESH")
filenameEXO = sys.argv[1]
filenameASCII = filenameEXO.replace(".exo", ".mesh")

from pylith.meshio.MeshIOAscii import MeshIOAscii
from pylith.meshio.MeshIOCubit import MeshIOCubit
import pylith.utils.petsc as petsc

petsc.initialize(sys.argv)

cubit = MeshIOCubit()
cubit.inventory.filename = filenameEXO
cubit._configure()

mesh = cubit.read(debug=False, interpolate=True)

ascii = MeshIOAscii()
ascii.inventory.filename = filenameASCII
ascii._configure()
ascii.write(mesh)

del cubit
del ascii
del mesh

petsc.finalize()

# End of file

  def _initialize(self):
    """
    Initialize fault.
    """
    dt = 2.4
    
    from spatialdata.units.Nondimensional import Nondimensional
    normalizer = Nondimensional()
    normalizer._configure()

    # Setup mesh
    cs = CSCart()
    cs.inventory.spaceDim = 2
    cs._configure()

    from pylith.meshio.MeshIOAscii import MeshIOAscii
    importer = MeshIOAscii()
    importer.inventory.filename = "data/tri3.mesh"
    importer.inventory.coordsys = cs
    importer._configure()
    mesh = importer.read(debug=False, interpolate=False)

    # Setup quadrature
    from pylith.feassemble.FIATSimplex import FIATSimplex
    cell = FIATSimplex()
    cell.inventory.dimension = 1
    cell.inventory.degree = 1
    cell.inventory.order = 1
    cell._configure()
    from pylith.feassemble.Quadrature import Quadrature
    quadrature = Quadrature()
    quadrature.inventory.cell = cell
    quadrature._configure()

    # Setup earthquake source
    from spatialdata.spatialdb.SimpleDB import SimpleDB
    from spatialdata.spatialdb.SimpleIOAscii import SimpleIOAscii
    ioFinalSlip = SimpleIOAscii()
    ioFinalSlip.inventory.filename = "data/tri3_finalslip.spatialdb"
    ioFinalSlip._configure()
    dbFinalSlip = SimpleDB()
    dbFinalSlip.inventory.iohandler = ioFinalSlip
    dbFinalSlip.inventory.label = "final slip"
    dbFinalSlip._configure()
    
    ioSlipTime = SimpleIOAscii()
    ioSlipTime.inventory.filename = "data/tri3_sliptime.spatialdb"
    ioSlipTime._configure()
    dbSlipTime = SimpleDB()
    dbSlipTime.inventory.iohandler = ioSlipTime
    dbSlipTime.inventory.label = "slip time"
    dbSlipTime._configure()
    
    from pylith.faults.StepSlipFn import StepSlipFn
    slipfn = StepSlipFn()
    slipfn.inventory.dbSlip = dbFinalSlip
    slipfn.inventory.dbSlipTime = dbSlipTime
    slipfn._configure()

    # Setup fault
    fault = FaultCohesiveKin()
    fault.inventory.output.inventory.writer._configure()
    fault.inventory.output._configure()
    fault.inventory.matId = 10
    fault.inventory.faultLabel = "fault"
    fault.inventory.upDir = [0, 0, 1]
    fault.inventory.faultQuadrature = quadrature
    fault._configure()
    eqsrc = fault.eqsrcs.components()[0]
    eqsrc.inventory.originTime = 1.23*second
    eqsrc.inventory.slipfn = slipfn
    eqsrc._configure()

    nvertices = fault.numVerticesNoMesh(mesh)
    firstFaultVertex = 0
    firstLagrangeVertex = nvertices
    firstFaultCell      = 2*nvertices
    fault.adjustTopology(mesh, firstFaultVertex, firstLagrangeVertex,
                         firstFaultCell)
    fault.preinitialize(mesh)
    fault.timeStep(dt)
    fault.verifyConfiguration()
    from pyre.units.time import s
    fault.initialize(totalTime=0.0*s, numTimeSteps=1, normalizer=normalizer)

    # Setup fields
    from pylith.topology.SolutionFields import SolutionFields
    fields = SolutionFields(mesh)
    fields.add("residual", "residual")
    fields.add("dispIncr(t->t+dt)", "displacement_increment")
    fields.add("disp(t)", "displacement")
    fields.solutionName("dispIncr(t->t+dt)")

    residual = fields.get("residual")
    residual.subfieldAdd("displacement", cs.spaceDim(), residual.VECTOR)
    residual.subfieldAdd("lagrange_multiplier", cs.spaceDim(), residual.VECTOR)
    residual.subfieldsSetup()
    residual.setupSolnChart()
    residual.setupSolnDof(cs.spaceDim())
    fault.setupSolnDof(residual)
#.........这里部分代码省略.........