Screen Areas, Iterate Through

Sometimes I need this but it's a pain to type, so here is how to iterate through current screen areas

import bpy

for window in bpy.context.window_manager.windows:
    for area in window.screen.areas:
        if area.type == 'VIEW_3D':
            print('yes!')

and deeper

import bpy


for window in bpy.context.window_manager.windows:
    for area in window.screen.areas:
        if area.type == 'VIEW_3D':
            print('yes!')
            print(dir(area))
            for space in area.spaces:
                print(space.type)
                if space.type=='VIEW_3D':
                    print(dir(space))