# Python List Comprehensions Help

**URL:** <https://forum.inductiveautomation.com/t/python-list-comprehensions-help/56621>\
**Category:** Ignition\
**Created:** [February 28, 2022, 3:12pm UTC](https://forum.inductiveautomation.com/t/python-list-comprehensions-help/56621 "2022-02-28T15:12:54Z")\
**Posts on this page:** 1\
**Showing post:** 44

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**Author:** ![zacharyw.larson](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/zacharyw.larson/32/23749_2.png) [@zacharyw.larson](https://forum.inductiveautomation.com/u/zacharyw.larson)\
**Post date:** [March 10, 2022, 6:13pm UTC](https://forum.inductiveautomation.com/t/python-list-comprehensions-help/56621/44 "2022-03-10T18:13:00Z")

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I call a script at 6:58am to sum net and gross quantities.  
Do you recommend to use :  
system.tag.readAsync()  
and  
system.tag.writeAsync()

?

and scenario 2  
I have read a ton of things, do math, write to a ton of things  
then it is recommended to use as few of blocking as I can?

I am researching when to use asych programming, but I am having a hard time with the abstractness/subjectiveness

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