pass variable to custom operator through iteration i'm trying to write a little addon to show all strips used in a vse timeline. and i also want it to have a "reveal file in explorer" button. So far so good, i have this to show strips with a pop up menu :

        scene = bpy.context.scene
        strip = scene.sequence_editor.sequences_all
        activeST = scene.sequence_editor.active_strip
        rstrip = activeST
        print(rstrip)

        #images/videos/sons
        for s in strip:
            if s.type == 'IMAGE':
                layout.label(s.name, icon='FILE_IMAGE')
                layout.label("  Start : " + str(s.frame_start) + "   End : " + str(int(s.frame_start)+int(s.frame_final_duration)-1))
                layout.operator('reveal.file_explorer')
            if s.type == 'SOUND':
                layout.label(s.name, icon='FILE_SOUND')
                layout.label("  Start : " + str(s.frame_start) + "   End : " + str(int(s.frame_start)+int(s.frame_final_duration)-1))
                layout.operator('reveal.file_explorer')
            if s.type == 'MOVIE':
                layout.label(s.name, icon='FILE_MOVIE')
                layout.label("  Start : " + str(s.frame_start) + "   End : " + str(int(s.frame_start)+int(s.frame_final_duration)-1))
                layout.operator('reveal.file_explorer')


all is working except for the custom "reveal.file_explorer" operator, here's its code :

def revealfileexplorer (s):

    if rstrip.type=='IMAGE':
        name='\\' + rstrip.elements[0].filename
        path=rstrip.directory
        Npath=os.path.abspath(bpy.path.abspath(path)) + name
        print(Npath)
        subprocess.Popen('explorer /select,"'+Npath+'"')

    if rstrip.type=='MOVIE':
        path=rstrip.filepath
        Npath=os.path.abspath(bpy.path.abspath(path))
        print(Npath)
        subprocess.Popen('explorer /select,"'+Npath+'"')

    if rstrip.type=='SOUND':
        path=rstrip.sound.filepath
        Npath=os.path.abspath(bpy.path.abspath(path))
        print(Npath)
        subprocess.Popen('explorer /select,"'+Npath+'"')

class RevealFile(bpy.types.Operator):
    """Reveal file in Explorer"""
    bl_idname = "reveal.file_explorer"
    bl_label = "Reveal"
    bl_options = {'REGISTER'}

    def execute(self, context):
        revealfileexplorer(s)
        return {'FINISHED'}


I tried to pass the "s" value to make the operator different with every file, and opening the right one... but "name "s" is not defined" according to blender. I'm not a coder basically, and no clue on how to do this...
Any help would be greatly appreciated :D
thanks in advance !
The problem is that in the execute function, s is not defined, you need to tell the operator what is s. 

A solution you could use is to add a property to the operator:

class AnimOperator(bpy.types.Operator):
    bl_idname = "object.anim_operator"
    bl_label = "Pose Anim Operator"
    s = bpy.props.StringProperty()
    ...
    def execute(self, context):
        revealfileexplorer(self.s)
        return {'FINISHED'}


notice the self.s to access the s in the AnimOperator class instance

Then when calling the operator, you have to define the value of s. 

op=layout.operator('reveal.file_explorer')
op.s = s


I didn't try this code so I maybe made some mistakes but you have the idea.

Those are object oriented programming and concepts and the scope of a variable problems, you'll maybe need to learn a little about that if you want to use programming language for more complex program.

Edit: I'm a little tired right now but looking back to you code there is another problem, you don't use s but rstrip in the revealfileexplorer function. I also suggest you to use the StringProperty but this will only accept text. I never tried to use complex types as operator parameter I think you are limited to Blender properties types but I'm not sure about that, I will test that tomorrow to give you a more precise answer if you need, but for now I think that you can solve your problem using only string, maybe with multiple StringProperty  if needed. You can also use a IntProperty, and pass the index as parameter, and then find your strip like that:

def revealfileexplorer (id):
     s = bpy.context.scene.sequence_editor.sequences_all[id]