import bpy

sliceAmount = 10

border_min_x = 0.5 - (0.5 / sliceAmount)
border_max_x = 0.5 + (0.5 / sliceAmount)

bpy.context.scene.render.border_min_x = border_min_x
bpy.context.scene.render.border_max_x = border_max_x

target = bpy.data.cameras["Camerasliced"]

bpy.context.user_preferences.edit.keyframe_new_interpolation_type = "LINEAR"
bpy.context.user_preferences.edit.keyframe_new_handle_type = "VECTOR"

target.animation_data_create()
target.animation_data.action = bpy.data.actions.new("Cam_Action")
fcurve = target.animation_data.action.fcurves.new("shift_x")

keyframe = fcurve.keyframe_points.insert(frame = 1, value = -0.450)
keyframe.interpolation = "LINEAR"
keyframe = fcurve.keyframe_points.insert(frame = sliceAmount, value = 0.450)
keyframe.interpolation = "LINEAR"
bpy.context.active_object.animation_data.action.fcurves[0].modifiers.new('CYCLES')

actiondata = target.animation_data.action