# making Catalyst Examples with python3.7.3

**URL:** https://discourse.paraview.org/t/making-catalyst-examples-with-python3-7-3/2122
**Category:** In Situ Support
**Created:** [June 26, 2019, 4:05pm UTC](https://discourse.paraview.org/t/making-catalyst-examples-with-python3-7-3/2122 "2019-06-26T16:05:17Z")
**Posts on this page:** 2
**Page:** 1

<div class="post-metadata">

### Author: ![jfavre](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/j/b5ac83/32.png) [@jfavre](https://discourse.paraview.org/u/jfavre)
#### Post date: [June 26, 2019, 4:05pm UTC](https://discourse.paraview.org/t/making-catalyst-examples-with-python3-7-3/2122/1 "2019-06-26T16:05:17Z")

</div>

in an attempt to build the Catalyst examples, I run into the following problem (using a most recent git clone of the dev branch):

[1%] Building CXX object CFullExample/CMakeFiles/CFullExampleAdaptor.dir/FEAdaptor.cxx.o  
[2%] Linking CXX static library libCFullExampleAdaptor.a  
[2%] Built target CFullExampleAdaptor  
Scanning dependencies of target CFullExample  
[4%] Building C object CFullExample/CMakeFiles/CFullExample.dir/FEDataStructures.c.o  
[5%] Building C object CFullExample/CMakeFiles/CFullExample.dir/FEDriver.c.o  
[6%] Linking CXX executable CFullExample  
/usr/bin/ld: /local/apps/ParaView/ParaViewBuild/lib/libvtkWrappingPythonCore-pv5.6.so.1: undefined reference to `PyUnicode_InternFromString' /usr/bin/ld: /local/apps/ParaView/ParaViewBuild/lib/libvtkPVServerManagerCore-pv5.6.so.1: undefined reference to`PyLong\_FromLong’  
/usr/bin/ld: /local/apps/ParaView/ParaViewBuild/lib/libvtkWrappingPythonCore-pv5.6.so.1: undefined reference to `PyExc\_KeyError’

and a whole list of errors…Seems like I have seen this before. Is this the same problem which prevents me from turrning PARAVIEW\_BUILD\_TESTING to ON. It fails to link some tests.

I can’t find any message saying Python3 support is on;y partially implemented in the upcoming release.

J

---

<div class="post-metadata">

### Author: ![Dave\_DeMarle](https://discourse.paraview.org/user_avatar/discourse.paraview.org/dave_demarle/32/27_2.png) [@Dave\_DeMarle](https://discourse.paraview.org/u/Dave_DeMarle)
#### Post date: [June 27, 2019, 1:14pm UTC](https://discourse.paraview.org/t/making-catalyst-examples-with-python3-7-3/2122/2 "2019-06-27T13:14:11Z")

</div>

Thanks. Please open an issue for this, tagged 5.7.

We are actively working on tidying up loose ends in Python 3 support. Our plan is to release binaries and do deployments for both Py2 and Py3 in 5.7, and then drop Python 2 support in either the following or subsequent release.