# Expression class causing trouble for Python embedded in C++

**URL:** <https://fenicsproject.discourse.group/t/expression-class-causing-trouble-for-python-embedded-in-c/2851>\
**Category:** Uncategorized\
**Created:** [April 9, 2020, 4:05pm UTC](https://fenicsproject.discourse.group/t/expression-class-causing-trouble-for-python-embedded-in-c/2851 "2020-04-09T16:05:36Z")\
**Posts on this page:** 1\
**Showing post:** 7

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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:** [July 6, 2021, 9:16am UTC](https://fenicsproject.discourse.group/t/expression-class-causing-trouble-for-python-embedded-in-c/2851/7 "2021-07-06T09:16:35Z")

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> [@Peter\_Meisrimel](#):
>
> but it seems to have disappeared?

I know this is quite along time after the original post. However, I figured it is reasonable to note that you can send in an MPI communicator to the Expression class as a keyword argument, as shown in: [Error with IO in parallel - - #4 by dokken](https://fenicsproject.discourse.group/t/error-with-io-in-parallel/6151/4)

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