diff --git a/.gitignore b/.gitignore
index 284e9fe8..0c6a51db 100644
--- a/.gitignore
+++ b/.gitignore
@@ -18,5 +18,3 @@ test/*
 !test/issues/data_3960/VisIt_volume
 *.egg-info
 *.py#
-mfem/common/bilininteg_ext.i
-mfem/common/lininteg_ext.i
\ No newline at end of file
diff --git a/mfem/common/bilininteg_ext.i b/mfem/common/bilininteg_ext.i
new file mode 100644
index 00000000..99821135
--- /dev/null
+++ b/mfem/common/bilininteg_ext.i
@@ -0,0 +1,309 @@
+namespace mfem {
+%pythonappend BilinearFormIntegrator::BilinearFormIntegrator %{
+    self._coeff = args
+%}
+
+%pythonappend TransposeIntegrator::TransposeIntegrator %{
+    if own_bfi_ == 1:  bfi_.thisown = 0
+%}
+
+%pythonappend LumpedIntegrator::LumpedIntegrator %{
+    if own_bfi_ == 1:  bfi_.thisown = 0
+%}
+
+%pythonappend InverseIntegrator::InverseIntegrator %{
+    if own_integ == 1:  integ.thisown = 0
+%}
+
+%pythonappend SumIntegrator::SumIntegrator %{
+    self.own_integs = own_integs
+%}
+
+%pythonappend MixedScalarIntegrator::MixedScalarIntegrator %{
+    self._coeff = args
+%}
+
+%pythonappend MixedVectorIntegrator::MixedVectorIntegrator %{
+    self._coeff = args
+%}
+
+%pythonappend MixedScalarVectorIntegrator::MixedScalarVectorIntegrator %{
+    self._coeff = args
+%}
+
+%pythonappend MixedScalarMassIntegrator::MixedScalarMassIntegrator %{
+    self._coeff = args
+%}
+
+%pythonappend MixedVectorProductIntegrator::MixedVectorProductIntegrator %{
+    self._coeff = vq
+%}
+
+%pythonappend MixedScalarDerivativeIntegrator::MixedScalarDerivativeIntegrator %{
+    self._coeff = args
+%}
+
+%pythonappend MixedScalarWeakDerivativeIntegrator::MixedScalarWeakDerivativeIntegrator %{
+    self._coeff = args
+%}
+
+%pythonappend MixedScalarDivergenceIntegrator::MixedScalarDivergenceIntegrator %{
+    self._coeff = args
+%}
+
+%pythonappend MixedVectorDivergenceIntegrator::MixedVectorDivergenceIntegrator %{
+    self._coeff = vq
+%}
+
+%pythonappend MixedScalarWeakGradientIntegrator::MixedScalarWeakGradientIntegrator %{
+    self._coeff = args
+%}
+
+%pythonappend MixedScalarCurlIntegrator::MixedScalarCurlIntegrator %{
+    self._coeff = args
+%}
+
+%pythonappend MixedScalarWeakCurlIntegrator::MixedScalarWeakCurlIntegrator %{
+    self._coeff = args
+%}
+
+%pythonappend MixedVectorMassIntegrator::MixedVectorMassIntegrator %{
+    self._coeff = args
+%}
+
+%pythonappend MixedCrossProductIntegrator::MixedCrossProductIntegrator %{
+    self._coeff = vq
+%}
+
+%pythonappend MixedDotProductIntegrator::MixedDotProductIntegrator %{
+    self._coeff = vq
+%}
+
+%pythonappend MixedWeakGradDotIntegrator::MixedWeakGradDotIntegrator %{
+    self._coeff = vq
+%}
+
+%pythonappend MixedWeakDivCrossIntegrator::MixedWeakDivCrossIntegrator %{
+    self._coeff = vq
+%}
+
+%pythonappend MixedGradGradIntegrator::MixedGradGradIntegrator %{
+    self._coeff = args
+%}
+
+%pythonappend MixedCrossGradGradIntegrator::MixedCrossGradGradIntegrator %{
+    self._coeff = vq
+%}
+
+%pythonappend MixedCurlCurlIntegrator::MixedCurlCurlIntegrator %{
+    self._coeff = args
+%}
+
+%pythonappend MixedCrossCurlCurlIntegrator::MixedCrossCurlCurlIntegrator %{
+    self._coeff = vq
+%}
+
+%pythonappend MixedCrossCurlGradIntegrator::MixedCrossCurlGradIntegrator %{
+    self._coeff = vq
+%}
+
+%pythonappend MixedCrossGradCurlIntegrator::MixedCrossGradCurlIntegrator %{
+    self._coeff = vq
+%}
+
+%pythonappend MixedWeakCurlCrossIntegrator::MixedWeakCurlCrossIntegrator %{
+    self._coeff = vq
+%}
+
+%pythonappend MixedScalarWeakCurlCrossIntegrator::MixedScalarWeakCurlCrossIntegrator %{
+    self._coeff = vq
+%}
+
+%pythonappend MixedCrossGradIntegrator::MixedCrossGradIntegrator %{
+    self._coeff = vq
+%}
+
+%pythonappend MixedCrossCurlIntegrator::MixedCrossCurlIntegrator %{
+    self._coeff = vq
+%}
+
+%pythonappend MixedScalarCrossCurlIntegrator::MixedScalarCrossCurlIntegrator %{
+    self._coeff = vq
+%}
+
+%pythonappend MixedScalarCrossGradIntegrator::MixedScalarCrossGradIntegrator %{
+    self._coeff = vq
+%}
+
+%pythonappend MixedScalarCrossProductIntegrator::MixedScalarCrossProductIntegrator %{
+    self._coeff = vq
+%}
+
+%pythonappend MixedScalarWeakCrossProductIntegrator::MixedScalarWeakCrossProductIntegrator %{
+    self._coeff = vq
+%}
+
+%pythonappend MixedDirectionalDerivativeIntegrator::MixedDirectionalDerivativeIntegrator %{
+    self._coeff = vq
+%}
+
+%pythonappend MixedGradDivIntegrator::MixedGradDivIntegrator %{
+    self._coeff = vq
+%}
+
+%pythonappend MixedDivGradIntegrator::MixedDivGradIntegrator %{
+    self._coeff = vq
+%}
+
+%pythonappend MixedScalarWeakDivergenceIntegrator::MixedScalarWeakDivergenceIntegrator %{
+    self._coeff = vq
+%}
+
+%pythonappend MixedVectorGradientIntegrator::MixedVectorGradientIntegrator %{
+    self._coeff = args
+%}
+
+%pythonappend MixedVectorCurlIntegrator::MixedVectorCurlIntegrator %{
+    self._coeff = args
+%}
+
+%pythonappend MixedVectorWeakCurlIntegrator::MixedVectorWeakCurlIntegrator %{
+    self._coeff = args
+%}
+
+%pythonappend MixedVectorWeakDivergenceIntegrator::MixedVectorWeakDivergenceIntegrator %{
+    self._coeff = args
+%}
+
+%pythonappend GradientIntegrator::GradientIntegrator %{
+    self._coeff = args
+%}
+
+%pythonappend DiffusionIntegrator::DiffusionIntegrator %{
+    self._coeff = args
+%}
+
+%pythonappend MassIntegrator::MassIntegrator %{
+    self._coeff = args
+%}
+
+%pythonappend BoundaryMassIntegrator::BoundaryMassIntegrator %{
+    self._coeff = q
+%}
+
+%pythonappend ConvectionIntegrator::ConvectionIntegrator %{
+    self._coeff = q
+%}
+
+%pythonappend ConservativeConvectionIntegrator::ConservativeConvectionIntegrator %{
+    self._coeff = q
+%}
+
+%pythonappend GroupConvectionIntegrator::GroupConvectionIntegrator %{
+    self._coeff = q
+%}
+
+%pythonappend VectorMassIntegrator::VectorMassIntegrator %{
+    self._coeff = args
+%}
+
+%pythonappend VectorFEDivergenceIntegrator::VectorFEDivergenceIntegrator %{
+    self._coeff = args
+%}
+
+%pythonappend VectorFEWeakDivergenceIntegrator::VectorFEWeakDivergenceIntegrator %{
+    self._coeff = args
+%}
+
+%pythonappend VectorFECurlIntegrator::VectorFECurlIntegrator %{
+    self._coeff = args
+%}
+
+%pythonappend DerivativeIntegrator::DerivativeIntegrator %{
+    self._coeff = q
+%}
+
+%pythonappend CurlCurlIntegrator::CurlCurlIntegrator %{
+    self._coeff = args
+%}
+
+%pythonappend VectorCurlCurlIntegrator::VectorCurlCurlIntegrator %{
+    self._coeff = args
+%}
+
+%pythonappend MixedCurlIntegrator::MixedCurlIntegrator %{
+    self._coeff = args
+%}
+
+%pythonappend VectorFEMassIntegrator::VectorFEMassIntegrator %{
+    self._coeff = args
+%}
+
+%pythonappend VectorDivergenceIntegrator::VectorDivergenceIntegrator %{
+    self._coeff = args
+%}
+
+%pythonappend DivDivIntegrator::DivDivIntegrator %{
+    self._coeff = args
+%}
+
+%pythonappend VectorDiffusionIntegrator::VectorDiffusionIntegrator %{
+    self._coeff = args
+%}
+
+%pythonappend ElasticityIntegrator::ElasticityIntegrator %{
+    self._coeff = args
+%}
+
+%pythonappend ElasticityComponentIntegrator::ElasticityComponentIntegrator %{
+    self._coeff = parent_
+%}
+
+%pythonappend DGTraceIntegrator::DGTraceIntegrator %{
+    self._coeff = args
+%}
+
+%pythonappend NonconservativeDGTraceIntegrator::NonconservativeDGTraceIntegrator %{
+    self._coeff = args
+%}
+
+%pythonappend DGDiffusionIntegrator::DGDiffusionIntegrator %{
+    self._coeff = args
+%}
+
+%pythonappend DGDiffusionBR2Integrator::DGDiffusionBR2Integrator %{
+    self._coeff = args
+%}
+
+%pythonappend DGElasticityIntegrator::DGElasticityIntegrator %{
+    self._coeff = args
+%}
+
+%pythonappend ScalarProductInterpolator::ScalarProductInterpolator %{
+    self._coeff = sc
+%}
+
+%pythonappend ScalarVectorProductInterpolator::ScalarVectorProductInterpolator %{
+    self._coeff = sc
+%}
+
+%pythonappend VectorScalarProductInterpolator::VectorScalarProductInterpolator %{
+    self._coeff = vc
+%}
+
+%pythonappend ScalarCrossProductInterpolator::ScalarCrossProductInterpolator %{
+    self._coeff = vc
+%}
+
+%pythonappend VectorCrossProductInterpolator::VectorCrossProductInterpolator %{
+    self._coeff = vc
+%}
+
+%pythonappend VectorInnerProductInterpolator::VectorInnerProductInterpolator %{
+    self._coeff = vc
+%}
+
+%pythonappend SumIntegrator::AddIntegrator %{
+   if self.own_integs == 1: integ.thisown = 0
+%}
+}
diff --git a/mfem/common/lininteg_ext.i b/mfem/common/lininteg_ext.i
new file mode 100644
index 00000000..4c3643fc
--- /dev/null
+++ b/mfem/common/lininteg_ext.i
@@ -0,0 +1,68 @@
+namespace mfem {
+%pythonappend LinearFormIntegrator::LinearFormIntegrator %{
+    self._coeff = args
+%}
+%pythonappend DeltaLFIntegrator::DeltaLFIntegrator %{
+    self._coeff = args
+%}
+%pythonappend DomainLFIntegrator::DomainLFIntegrator %{
+    self._coeff = args
+%}
+%pythonappend DomainLFGradIntegrator::DomainLFGradIntegrator %{
+    self._coeff = QF
+%}
+%pythonappend BoundaryLFIntegrator::BoundaryLFIntegrator %{
+    self._coeff = QG
+%}
+%pythonappend BoundaryNormalLFIntegrator::BoundaryNormalLFIntegrator %{
+    self._coeff = QG
+%}
+%pythonappend BoundaryTangentialLFIntegrator::BoundaryTangentialLFIntegrator %{
+    self._coeff = QG
+%}
+%pythonappend VectorDomainLFIntegrator::VectorDomainLFIntegrator %{
+    self._coeff = QF
+%}
+%pythonappend VectorDomainLFGradIntegrator::VectorDomainLFGradIntegrator %{
+    self._coeff = QF
+%}
+%pythonappend VectorBoundaryLFIntegrator::VectorBoundaryLFIntegrator %{
+    self._coeff = QG
+%}
+%pythonappend VectorFEDomainLFIntegrator::VectorFEDomainLFIntegrator %{
+    self._coeff = F
+%}
+%pythonappend VectorFEDomainLFCurlIntegrator::VectorFEDomainLFCurlIntegrator %{
+    self._coeff = F
+%}
+%pythonappend VectorFEDomainLFDivIntegrator::VectorFEDomainLFDivIntegrator %{
+    self._coeff = QF
+%}
+%pythonappend VectorBoundaryFluxLFIntegrator::VectorBoundaryFluxLFIntegrator %{
+    self._coeff = (f, ir)
+%}
+%pythonappend VectorFEBoundaryFluxLFIntegrator::VectorFEBoundaryFluxLFIntegrator %{
+    self._coeff = args
+%}
+%pythonappend VectorFEBoundaryTangentLFIntegrator::VectorFEBoundaryTangentLFIntegrator %{
+    self._coeff = QG
+%}
+%pythonappend BoundaryFlowIntegrator::BoundaryFlowIntegrator %{
+    self._coeff = args
+%}
+%pythonappend DGDirichletLFIntegrator::DGDirichletLFIntegrator %{
+    self._coeff = args
+%}
+%pythonappend DGElasticityDirichletLFIntegrator::DGElasticityDirichletLFIntegrator %{
+    self._coeff = uD_
+%}
+%pythonappend WhiteGaussianNoiseDomainLFIntegrator::WhiteGaussianNoiseDomainLFIntegrator %{
+    self._coeff = QG
+%}
+%pythonappend VectorQuadratureLFIntegrator::VectorQuadratureLFIntegrator %{
+    self._coeff = (vqfc, ir)
+%}
+%pythonappend QuadratureLFIntegrator::QuadratureLFIntegrator %{
+    self._coeff = (qfc, ir)
+%}
+}
\ No newline at end of file