How to create a `files`-parameter for the bpy.ops.sequencer.image_strip_add()-operator? I'm trying to figure out how to do things with Python in Blender and am struggling really hard to get even the most basic things done. The construction of the override-parameter in my script below is probably not ideal but seems to work. 

The files-arg is of course nonsense. As I understand it I would need to construct a bpy.types.bpy_prop_collection of bpy.types.OperatorFileListElement. But I have no clue how to initialize either of them. 

import bpy

screen = bpy.context.window.screen

area   = [area for area in screen.areas if area.type == 'SEQUENCE_EDITOR'][0]
region = [region for region in area.regions if region.type == 'WINDOW'][0]

override = {'window': bpy.context.window, 
            'screen': screen, 
            'area': area, 
            'region': region, 
            'scene': bpy.context.scene}

bpy.ops.sequencer.image_strip_add(override, channel=3, files=("test",))
Don't use operators to do this; they aren't intended to be called from Python.

The regular data/function API is much simpler to use:

import bpy

se = bpy.context.scene.sequence_editor_create()
seq = se.sequences.new_image('hey', 'C:/temp/hey.png', 1, 1)