blenderSB select timeline range through marker

marker_timeline_range_select.py

import bpy

# navigate in timeline with marker
# markers must be named "start_1" "end_1" then "start_2" ...

scn = bpy.context.scene

def RangePart(n):
    n = str(n)
    scn.frame_start = scn.timeline_markers['start_' + n].frame
    scn.frame_end = scn.timeline_markers['end_' + n].frame
    print ("set scene:", n)

def Select_layers(l):
    '''select layer in list passed in parameter (with 'real' layer number)'''
    for i, layer in enumerate(l):
        l[i] = layer - 1

    for i in range(0,20):
        if i in l:
            bpy.context.scene.layers[i] = True
        else:
            bpy.context.scene.layers[i] = False
            

#Scene1
def Scene1():
    Select_layers([1])
    RangePart(1)


#scene2
def Scene2():
    Select_layers([1,11])
    RangePart(2)

#scene3
def Scene3():
    Select_layers([3,4])
    RangePart(3)

if scn.frame_start == scn.timeline_markers['start_1'].frame:
    Scene2()
elif scn.frame_start == scn.timeline_markers['start_2'].frame:
    Scene3()
else:
    Scene1()