# How to iterate over csv or list?

**URL:** <https://discourse.mcneel.com/t/how-to-iterate-over-csv-or-list/87544>\
**Category:** Grasshopper\
**Tags:** list\
**Created:** [August 15, 2019, 3:57pm UTC](https://discourse.mcneel.com/t/how-to-iterate-over-csv-or-list/87544 "2019-08-15T15:57:52Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![mateuszploszajmazure](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/mateuszploszajmazure/32/685294_2.png) [@mateuszploszajmazure](https://discourse.mcneel.com/u/mateuszploszajmazure)\
**Post date:** [August 15, 2019, 3:57pm UTC](https://discourse.mcneel.com/t/how-to-iterate-over-csv-or-list/87544/1 "2019-08-15T15:57:52Z")

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Hi, I have a csv file, which then I convert to list object in gh.  
I Wonder how can I iterate over this file running things like simulations, so each time it takes 1 value and calculates everything, then goes back to the list and calculate next?

Similar like when you use Galapagos, the script reruns each time, but this time I want to have control on the values picked…

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**Author:** ![tim.stark](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/tim.stark/32/704108_2.png) [@tim.stark](https://discourse.mcneel.com/u/tim.stark)\
**Post date:** [August 15, 2019, 4:00pm UTC](https://discourse.mcneel.com/t/how-to-iterate-over-csv-or-list/87544/2 "2019-08-15T16:00:52Z")

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Coding (for example python or c#) or via plugins (for example Anemone or hoopsnake)

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**Author:** ![Rickson](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/rickson/32/690545_2.png) [@Rickson](https://discourse.mcneel.com/u/Rickson)\
**Post date:** [August 15, 2019, 4:15pm UTC](https://discourse.mcneel.com/t/how-to-iterate-over-csv-or-list/87544/3 "2019-08-15T16:15:37Z")

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Here’s an example using Anemone iterating through branches.

 ![image](https://global.discourse-cdn.com/mcneel/uploads/default/original/3X/a/c/ac65477645f474200a9b2ee32b9957a6597253da.png)