ModuleNotFoundError: No module named 'OCC.Core'

[roipoussiere]

In order to produce a flatpak, I'm trying to install cadquery from sources. This is a long work (it require to install oce, python-occ and other dependencies from sources) but I think I can see the light at the end of the tunnel. :)

I get the same error as #150 when I try to import cadquery, but I prefer to open a new issue as the other one is fixed.

>>> import OCC
>>> import cadquery
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/app/lib/python3.7/site-packages/cadquery/__init__.py", line 2, in <module>
    from .occ_impl.geom import Plane, BoundBox, Vector, Matrix
  File "/app/lib/python3.7/site-packages/cadquery/occ_impl/geom.py", line 3, in <module>
    from OCC.Core.gp import (
ModuleNotFoundError: No module named 'OCC.Core'

Installed dependencies:

• glu 9.0.1
• freeglut 3.2.1
• oce 0.18.3
• swig 3.0.12
• pythonocc-core 0.18.1 (cadquery fork)
• pyparsing 2.4.7
• cadquery 2.0

ls /app/lib/python3.7/site-packages/OCC/

Adaptor2d.py       _BRepCheck.so        _Dico.so        GeomConvert.py       _Interface.so  Precision.py         _StdFail.so     _TDF.so
_Adaptor2d.so      BRepClass3d.py       Display     _GeomConvert.so       Intf.py       _Precision.so        StdPrs.py       TDocStd.py
Adaptor3d.py       _BRepClass3d.so      Draft.py        GeomFill.py      _Intf.so       Primitives.py        _StdPrs.so  _TDocStd.so
_Adaptor3d.so      BRepClass.py     _Draft.so       _GeomFill.so         IntImpParGen.py    _Primitives.so       StdSelect.py    TFunction.py
Addons.py      _BRepClass.so        DsgPrs.py       GeomInt.py       _IntImpParGen.so   ProjLib.py       _StdSelect.so   _TFunction.so
_Addons.so     BRepExtrema.py       _DsgPrs.so      _GeomInt.so      IntImp.py      _ProjLib.so      StepAP203.py    TNaming.py
AdvApp2Var.py      _BRepExtrema.so      Dynamic.py      GeomLib.py       _IntImp.so Prs3d.py         _StepAP203.so   _TNaming.so
_AdvApp2Var.so     BRepFeat.py          _Dynamic.so _GeomLib.so      IntPatch.py    _Prs3d.so        StepAP209.py    TopAbs.py
AdvApprox.py       _BRepFeat.so     ElCLib.py       GeomLProp.py         _IntPatch.so   PrsMgr.py        _StepAP209.so   _TopAbs.so
_AdvApprox.so      BRepFilletAPI.py     _ElCLib.so      _GeomLProp.so        IntPolyh.py    _PrsMgr.so       StepAP214.py    TopBas.py
AIS.py         _BRepFilletAPI.so        ElSLib.py       GeomPlate.py         _IntPolyh.so   __pycache__      _StepAP214.so   _TopBas.so
_AIS.so        BRepFill.py          _ElSLib.so      _GeomPlate.so        IntPoly.py Quantity.py      StepBasic.py    TopClass.py
AppBlend.py    _BRepFill.so     ExprIntrp.py    GeomProjLib.py       _IntPoly.so    _Quantity.so         _StepBasic.so   _TopClass.so
_AppBlend.so       BRepGProp.py     _ExprIntrp.so   _GeomProjLib.so       IntRes2d.py   Resource.py      STEPCAFControl.py   TopCnx.py
AppCont.py     _BRepGProp.so        Expr.py     Geom.py          _IntRes2d.so   _Resource.so         _STEPCAFControl.so  _TopCnx.so
_AppCont.so    BRepIntCurveSurface.py   _Expr.so        _Geom.so         Intrv.py       RWStepAP203.py       STEPConstruct.py    TopExp.py
AppDef.py      _BRepIntCurveSurface.so  Extrema.py      GeomTools.py         _Intrv.so      _RWStepAP203.so      _STEPConstruct.so   _TopExp.so
_AppDef.so     BRepLib.py           _Extrema.so _GeomTools.so        IntStart.py    RWStepAP214.py       STEPControl.py  TopLoc.py
AppParCurves.py     _BRepLib.so         FairCurve.py    GeomToStep.py        _IntStart.so   _RWStepAP214.so      _STEPControl.so     _TopLoc.so
_AppParCurves.so    BRepLProp.py        _FairCurve.so   _GeomToStep.so       IntSurf.py RWStepBasic.py       StepDimTol.py   TopoDS.py
ApproxInt.py       _BRepLProp.so        FEmTool.py      gp.py            _IntSurf.so    _RWStepBasic.so      _StepDimTol.so  _TopoDS.so
_ApproxInt.so      BRepMAT2d.py     _FEmTool.so GProp.py         IntTools.py    RWStepDimTol.py      STEPEdit.py     TopoDSToStep.py
Approx.py      _BRepMAT2d.so        FilletSurf.py   _GProp.so        _IntTools.so   _RWStepDimTol.so     _STEPEdit.so    _TopoDSToStep.so
_Approx.so     BRepMesh.py          _FilletSurf.so  _gp.so           IntWalk.py RWStepElement.py     StepElement.py  TopOpeBRepBuild.py
AppStdL.py     _BRepMesh.so     FSD.py      GraphDS.py       _IntWalk.so    _RWStepElement.so    _StepElement.so     _TopOpeBRepBuild.so
_AppStdL.so    BRepOffsetAPI.py     _FSD.so     _GraphDS.so      Law.py     RWStepFEA.py         StepFEA.py  TopOpeBRepDS.py
AppStd.py      _BRepOffsetAPI.so        GccAna.py       Graphic3d.py         _Law.so        _RWStepFEA.so        _StepFEA.so     _TopOpeBRepDS.so
_AppStd.so     BRepOffset.py        _GccAna.so      _Graphic3d.so        LICENSE        RWStepGeom.py        StepGeom.py     TopOpeBRep.py
Aspect.py      _BRepOffset.so       GccEnt.py       GraphTools.py        LocalAnalysis.py   _RWStepGeom.so       _StepGeom.so    _TopOpeBRep.so
_Aspect.so     BRepPrimAPI.py       _GccEnt.so      _GraphTools.so       _LocalAnalysis.so  RWStepRepr.py        StepRepr.py     TopOpeBRepTool.py
AUTHORS        _BRepPrimAPI.so      GccGeo.py       HatchGen.py      LocOpe.py      _RWStepRepr.so       _StepRepr.so    _TopOpeBRepTool.so
Bisector.py    BRepPrim.py          _GccGeo.so      _HatchGen.so         _LocOpe.so RWStepShape.py       STEPSelections.py   TopTools.py
_Bisector.so       _BRepPrim.so     GccInt.py       Hatch.py         LProp3d.py _RWStepShape.so      _STEPSelections.so  _TopTools.so
BiTgte.py      BRepProj.py          _GccInt.so      _Hatch.so        _LProp3d.so    RWStepVisual.py      StepShape.py    TopTrans.py
_BiTgte.so     _BRepProj.so     GccIter.py      Hermit.py        LProp.py       _RWStepVisual.so     _StepShape.so   _TopTrans.so
BlendFunc.py       BRep.py          _GccIter.so _Hermit.so       _LProp.so      RWStl.py         StepToGeom.py   TPrsStd.py
_BlendFunc.so      _BRep.so         GCE2d.py        HLRAlgo.py       MAT2d.py       _RWStl.so        _StepToGeom.so  _TPrsStd.so
Blend.py       BRepSweep.py     _GCE2d.so       _HLRAlgo.so      _MAT2d.so      Select3D.py      StepToTopoDS.py     TShort.py
_Blend.so      _BRepSweep.so        gce.py      HLRAppli.py      Materials.py   _Select3D.so         _StepToTopoDS.so    _TShort.so
BndLib.py      BRepTools.py     _gce.so     _HLRAppli.so         _Materials.so  SelectBasics.py      StepVisual.py   UnitsAPI.py
_BndLib.so     _BRepTools.so        GCPnts.py       HLRBRep.py       math.py        _SelectBasics.so     _StepVisual.so  _UnitsAPI.so
Bnd.py         BRepTopAdaptor.py        _GCPnts.so      _HLRBRep.so      _math.so       SelectMgr.py         StlAPI.py       Units.py
_Bnd.so        _BRepTopAdaptor.so       GC.py       HLRTopoBRep.py       MAT.py     _SelectMgr.so        _StlAPI.so  _Units.so
BOPAlgo.py     BSplCLib.py          _GC.so      _HLRTopoBRep.so       _MAT.so       ShapeAlgo.py         StlMesh.py  UTL.py
_BOPAlgo.so    _BSplCLib.so     Geom2dAdaptor.py    IFSelect.py      MeshVS.py      _ShapeAlgo.so        _StlMesh.so     _UTL.so
BOPCol.py      BSplSLib.py          _Geom2dAdaptor.so   _IFSelect.so         _MeshVS.so ShapeAnalysis.py     StlTransfer.py  V3d.py
_BOPCol.so     _BSplSLib.so     Geom2dAPI.py    IGESCAFControl.py     Message.py    _ShapeAnalysis.so    _StlTransfer.so     _V3d.so
BOPDS.py       CDF.py           _Geom2dAPI.so   _IGESCAFControl.so    _Message.so   ShapeBuild.py        Storage.py  Visual3d.py
_BOPDS.so      _CDF.so          Geom2dConvert.py    IGESControl.py       MMgt.py        _ShapeBuild.so       _Storage.so     _Visual3d.so
BOPInt.py      CDM.py           _Geom2dConvert.so   _IGESControl.so       _MMgt.so      ShapeConstruct.py    Sweep.py        Visualization.py
_BOPInt.so     _CDM.so          Geom2dGcc.py    Image.py         NCollection.py _ShapeConstruct.so   _Sweep.so       _Visualization.so
BOPTools.py    ChFi2d.py            _Geom2dGcc.so   _Image.so        _NCollection.so    ShapeCustom.py       TColGeom2d.py   Voxel.py
_BOPTools.so       _ChFi2d.so           Geom2dHatch.py  IncludeLibrary.py     NIS.py        _ShapeCustom.so      _TColGeom2d.so  _Voxel.so
BRepAdaptor.py     ChFi3d.py            _Geom2dHatch.so _IncludeLibrary.so    _NIS.so       ShapeExtend.py       TColGeom.py     XBRepMesh.py
_BRepAdaptor.so     _ChFi3d.so          Geom2dInt.py    __init__.py      NLPlate.py _ShapeExtend.so      _TColGeom.so    _XBRepMesh.so
BRepAlgoAPI.py     ChFiDS.py            _Geom2dInt.so   IntAna2d.py      _NLPlate.so    ShapeFix.py      TColgp.py       XCAFApp.py
_BRepAlgoAPI.so     _ChFiDS.so          Geom2dLProp.py  _IntAna2d.so         OSD.py     _ShapeFix.so         _TColgp.so  _XCAFApp.so
BRepAlgo.py    ChFiKPart.py     _Geom2dLProp.so IntAna.py        _OSD.so        ShapeProcessAPI.py   TCollection.py  XCAFDoc.py
_BRepAlgo.so       _ChFiKPart.so        Geom2d.py       _IntAna.so       PCDM.py        _ShapeProcessAPI.so  _TCollection.so     _XCAFDoc.so
BRepApprox.py      Contap.py            _Geom2d.so      IntCurve.py      _PCDM.so       ShapeProcess.py      TColQuantity.py     XCAFPrs.py
_BRepApprox.so     _Contap.so           GeomAbs.py      IntCurvesFace.py      Plate.py      _ShapeProcess.so     _TColQuantity.so    _XCAFPrs.so
BRepBlend.py       Convert.py           _GeomAbs.so _IntCurvesFace.so     _Plate.so     ShapeUpgrade.py      TColStd.py  XSControl.py
_BRepBlend.so      _Convert.so          GeomAdaptor.py  _IntCurve.so         PLib.py        _ShapeUpgrade.so     _TColStd.so     _XSControl.so
BRepBndLib.py      CPnts.py         _GeomAdaptor.so IntCurveSurface.py    _PLib.so      SortTools.py         TDataStd.py
_BRepBndLib.so     _CPnts.so            GEOMAlgo.py _IntCurveSurface.so   Plugin.py     _SortTools.so        _TDataStd.so
BRepBuilderAPI.py   CSLib.py            _GEOMAlgo.so    InterfaceGraphic.py   _Plugin.so    Standard.py      TDataXtd.py
_BRepBuilderAPI.so  _CSLib.so           GeomAPI.py      _InterfaceGraphic.so  Poly.py       _Standard.so         _TDataXtd.so
BRepCheck.py       Dico.py          _GeomAPI.so Interface.py         _Poly.so       StdFail.py       TDF.py

Note that run_tests.py from python-occ is executed without error.

If I understand well, OCC module has been renamed to OCC.Core in the last release (related commit).

So why I still don't have OCC.Core in my site-packages? Should I use the latest git commit instead of using the latest release?

[roipoussiere]

Should I use the latest git commit instead of using the latest release?

This seems better, except one failure in unit tests (#345).

[adam-urbanczyk]

No OCC.Core indicates outdated PythonOCC version.

[roipoussiere]

No OCC.Core indicates outdated PythonOCC version.

I used the latest release of the CadQuery fork of pythonocc-core.

[roipoussiere]

What changes are applied to the CadQuery fork of pythonocc-core compared to the upstream?

Can I safely use the upstream instead of the cq fork in order to use the more recent 0.18.2?

The fact is I'm producing a CADquery flatpak and I would like to base it from a release, not from the latest git commit, in order to be sure that the build is reproducible and the app is stable.

[adam-urbanczyk]

Just use the HEAD of the CQ fork. Changes are related to visualization, If you are only interested in CQ (thus not CQ-editor) then upstream is fine.

[roipoussiere]

Ok thanks.