Get a Index number by a specific Value in a List


What I want is to get the index number of a list of a specific value, for example, if I have the functions of the layers of a wall in the list, I want it to give me the index value only of the Structure layer, which depending of the wall and its configuration will change,

My purpose is then to use this index number to filter from the wall thickness list the value I need,

Excuse my English but I am using a translator,

I wait your answer,

Thank you

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