import bpy
 C=bpy.context
 
 sns=C.screen
 areas=sns.areas
 area=None

 for i in areas:
     if i.type=='VIEW_3D':
         area=i
         break
         
 spaces=area.spaces
 for i in spaces:
     if i.type=='VIEW_3D':
         space=i
         break
         
 region=space.region_3d
 
 print( region.view_matrix )