# New CMS blog - preprocess in open\_mfdataset

**URL:** <https://forum.access-hive.org.au/t/new-cms-blog-preprocess-in-open-mfdataset/911>\
**Category:** Technical\
**Tags:** python, xarray\
**Created:** [28 June 2023 02:35 UTC](https://forum.access-hive.org.au/t/new-cms-blog-preprocess-in-open-mfdataset/911 "2023-06-28T02:35:17Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![dale.roberts](https://avatars.discourse-cdn.com/v4/letter/d/848f3c/32.png) [@dale.roberts](https://forum.access-hive.org.au/u/dale.roberts)\
**Post date:** [28 June 2023 02:35 UTC](https://forum.access-hive.org.au/t/new-cms-blog-preprocess-in-open-mfdataset/911/1 "2023-06-28T02:35:17Z")

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Hi All

CMS has put together a blog entry about using the `preprocess` argument to `xarray.open_mfdataset()` here: [More efficent use of xarray.open\_mfdataset() — CLEX CMS Blog](https://coecms.github.io/posts/2023-06-22-mfdataset-preprocess.html). I’m sure many of you (especially the COSMIA folks) already know about this, but when I went looking for examples and tutorials there wasn’t much around. I hope some people find this helpful!

Edit: URL updated

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**Author:** ![rmholmes](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.access-hive.org.au/rmholmes/32/117_2.png) [@rmholmes](https://forum.access-hive.org.au/u/rmholmes)\
**Post date:** [28 June 2023 03:03 UTC](https://forum.access-hive.org.au/t/new-cms-blog-preprocess-in-open-mfdataset/911/2 "2023-06-28T03:03:18Z")

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Brilliant!

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**Author:** ![Paola-CMS](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.access-hive.org.au/paola-cms/32/57_2.png) [@Paola-CMS](https://forum.access-hive.org.au/u/Paola-CMS)\
**Post date:** [13 November 2024 03:18 UTC](https://forum.access-hive.org.au/t/new-cms-blog-preprocess-in-open-mfdataset/911/3 "2024-11-13T03:18:32Z")

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Just in case someone lands here, the url for the CMS blogs is now:  
[CLEX CMS Blog — CLEX CMS Blog](https://coecms.github.io/index.html)

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**Author:** ![Aidan](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.access-hive.org.au/aidan/32/42_2.png) [@Aidan](https://forum.access-hive.org.au/u/Aidan)\
**Post date:** [17 November 2024 22:58 UTC](https://forum.access-hive.org.au/t/new-cms-blog-preprocess-in-open-mfdataset/911/4 "2024-11-17T22:58:31Z")

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I updated the post to point to the GitHub pages URL.