# SlicerElastix not compatible with nightly

**URL:** <https://discourse.slicer.org/t/slicerelastix-not-compatible-with-nightly/6505>\
**Category:** Development\
**Tags:** bug\
**Created:** [April 15, 2019, 3:35pm UTC](https://discourse.slicer.org/t/slicerelastix-not-compatible-with-nightly/6505 "2019-04-15T15:35:26Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Alex\_Vergara](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/alex_vergara/32/15205_2.png) [@Alex\_Vergara](https://discourse.slicer.org/u/Alex_Vergara)\
**Post date:** [April 15, 2019, 3:35pm UTC](https://discourse.slicer.org/t/slicerelastix-not-compatible-with-nightly/6505/1 "2019-04-15T15:35:26Z")

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When installing SlicerElastix it says

File “/Users/alex/Applications/Slicer.app/Contents/Extensions-28138/SlicerElastix/lib/Slicer-4.11/qt-scripted-modules/Elastix.py”, line 330  
print e  
^  
SyntaxError: Missing parentheses in call to ‘print’. Did you mean print(e)?

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [April 15, 2019, 3:43pm UTC](https://discourse.slicer.org/t/slicerelastix-not-compatible-with-nightly/6505/2 "2019-04-15T15:43:09Z")

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Thanks for reporting this. Slicer core has been upgraded to Python3 but most extensions have not been made Python3 compatible yet.

@jcfr are you going to submit a pull request for SlicerElastix? In general, do you plan to send pull requests for most extensions?

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**Author:** ![Alex\_Vergara](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/alex_vergara/32/15205_2.png) [@Alex\_Vergara](https://discourse.slicer.org/u/Alex_Vergara)\
**Post date:** [April 15, 2019, 3:46pm UTC](https://discourse.slicer.org/t/slicerelastix-not-compatible-with-nightly/6505/3 "2019-04-15T15:46:43Z")

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I am very happy for the python3 upgrade 😃 Now the bundled python can release the GIL and numpy runs in multiprocessing using several cores.

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**Author:** ![jcfr](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jcfr/32/17825_2.png) [@jcfr](https://discourse.slicer.org/u/jcfr)\
**Post date:** [April 15, 2019, 11:50pm UTC](https://discourse.slicer.org/t/slicerelastix-not-compatible-with-nightly/6505/4 "2019-04-15T23:50:33Z")

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> [@lassoan](#):
>
> are you going to submit a pull request for SlicerElastix?

SlicerElastix has been updated to support Python3.

> [@lassoan](#):
>
> In general, do you plan to send pull requests for most extensions?

This will happen on “as needed” basis.

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [April 16, 2019, 1:03am UTC](https://discourse.slicer.org/t/slicerelastix-not-compatible-with-nightly/6505/5 "2019-04-16T01:03:12Z")

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> [@jcfr](#):
>
> SlicerElastix has been updated to support Python3.

Great, thank you!

> [@jcfr](#):
>
> This will happen on “as needed” basis.

Do you mean we can ask for your help whenever we want to upgrade an extension to be compatible with Python3?