# Problem with Expression since 2017.2

**URL:** <https://fenicsproject.discourse.group/t/problem-with-expression-since-2017-2/500>\
**Category:** Uncategorized\
**Created:** [April 3, 2019, 12:47pm UTC](https://fenicsproject.discourse.group/t/problem-with-expression-since-2017-2/500 "2019-04-03T12:47:12Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![dokken](https://yyz2.discourse-cdn.com/free1/user_avatar/fenicsproject.discourse.group/dokken/32/1560_2.png) [@dokken](https://fenicsproject.discourse.group/u/dokken)\
**Post date:** [April 4, 2019, 6:56am UTC](https://fenicsproject.discourse.group/t/problem-with-expression-since-2017-2/500/2 "2019-04-04T06:56:23Z")

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The way to use cpp expressions has changed since 2017.2.0.  
See for instance: [https://bitbucket.org/fenics-project/dolfin/src/master/python/demo/documented/tensor-weighted-poisson/demo\_tensor-weighted-poisson.py](https://bitbucket.org/fenics-project/dolfin/src/master/python/demo/documented/tensor-weighted-poisson/demo_tensor-weighted-poisson.py) for an example on how to use cpp\_code in expressions.

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