Is PL_ also supposed to be a string?  Seems like you just missed your 
quotation marks at the beginning and post string that surround the 
arguments.  Also...I'd recommend not hard baking these sorts of things in, 
but passing as an argument...

Aka:

lookThroughModelPanel ("PL_" + $SceneName + "_CAM:Cam_Rig:camera_Model") 
"modelPanel4";

Have a look at this guy's post about this and a good tip in the future is to 
google the function name since there's tons of posts online about these these 
days:
http://nathananozie.blogspot.com/2012/08/python-and-mel-side-by-side.html

You should also look at a refresher of variables/string concatenation just so 
you can learn a little bit more about how to use them in MEL:
https://accad.osu.edu/~aprice/courses/694/variables.html


On Sunday, April 23, 2017 at 8:42:17 AM UTC-4, gnn wrote:
>
> Hello,
>
> I'm trying to replace by a string variable a part of a mel command...and 
> use this inside of a python script...
>
> thank a lot for helping me
>
>  
>
> string $SceneName = "100";
> lookThroughModelPanel PL_" + $SceneName + "_CAM:Cam_Rig:camera_Model 
> modelPanel4;
>
>

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