# Loop over TimestepValues : NOT Updating
**URL:** https://discourse.paraview.org/t/loop-over-timestepvalues-not-updating/7495
**Category:** ParaView Support
**Tags:** python
**Created:** [June 27, 2021, 6:00am UTC](https://discourse.paraview.org/t/loop-over-timestepvalues-not-updating/7495 "2021-06-27T06:00:07Z")
**Posts on this page:** 9
**Page:** 1
### Author:  [@Akash](https://discourse.paraview.org/u/Akash)
#### Post date: [June 27, 2021, 6:00am UTC](https://discourse.paraview.org/t/loop-over-timestepvalues-not-updating/7495/1 "2021-06-27T06:00:07Z")
Hey,
I am trying to loop over my data with timestep. When I give values for n manually it works well. Here is the code:
```auto
n=34
a3d10meshfinefoam.UpdatePipeline(a3d10meshfinefoam.TimestepValues[n])
```
But when I do the same thing with a loop (both FOR and WHILE) the timestep is not changing.Here is the code:
```auto
n=0
while(n<=48):
a3d10meshfinefoam.UpdatePipeline(a3d10meshfinefoam.TimestepValues[n])
...
...
...
n=n+1
```
I checked whether n is incrementing properly and it does but still, the time is not incrementing
---
### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [June 27, 2021, 5:22pm UTC](https://discourse.paraview.org/t/loop-over-timestepvalues-not-updating/7495/2 "2021-06-27T17:22:18Z")
> [@Akash](#):
>
> the time is not incrementing
How do you check ?
---
### Author:  [@Akash](https://discourse.paraview.org/u/Akash)
#### Post date: [June 27, 2021, 6:12pm UTC](https://discourse.paraview.org/t/loop-over-timestepvalues-not-updating/7495/3 "2021-06-27T18:12:22Z")
While saving the data I named it as ‘Filename\_%d.csv’%n so the filenames were coming properly with different n values however all the files had the same data at timestep = 0. idk why
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### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [June 27, 2021, 8:20pm UTC](https://discourse.paraview.org/t/loop-over-timestepvalues-not-updating/7495/4 "2021-06-27T20:20:42Z")
please share your script
---
### Author:  [@Akash](https://discourse.paraview.org/u/Akash)
#### Post date: [June 27, 2021, 8:33pm UTC](https://discourse.paraview.org/t/loop-over-timestepvalues-not-updating/7495/5 "2021-06-27T20:33:55Z")
Here is the script:
[script.txt](https://discourse.paraview.org/uploads/short-url/qnQEVDXjWwWG8mqV8MtRtCkvT4S.txt) (1.5 KB)
---
### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [June 28, 2021, 8:36am UTC](https://discourse.paraview.org/t/loop-over-timestepvalues-not-updating/7495/6 "2021-06-28T08:36:16Z")
You need to call UpdatePipeline(time) on the plot over line filter.
---
### Author:  [@Akash](https://discourse.paraview.org/u/Akash)
#### Post date: [June 28, 2021, 9:50am UTC](https://discourse.paraview.org/t/loop-over-timestepvalues-not-updating/7495/7 "2021-06-28T09:50:42Z")
Could you send the code line for that?
---
### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [June 28, 2021, 9:53am UTC](https://discourse.paraview.org/t/loop-over-timestepvalues-not-updating/7495/8 "2021-06-28T09:53:27Z")
not tested.
[script.txt](https://discourse.paraview.org/uploads/short-url/AhMs7JSpYml5q1QEcHccq0Ookcz.txt) (1.5 KB)
---
### Author:  [@Akash](https://discourse.paraview.org/u/Akash)
#### Post date: [June 28, 2021, 10:14am UTC](https://discourse.paraview.org/t/loop-over-timestepvalues-not-updating/7495/9 "2021-06-28T10:14:45Z")
It works. Initially it said “name ‘plotOverLine1’ is not defined” so i just defined it earlier before the loop and it works perfectly. Thanks a lot 😄