Register Decorator

@decorate
def target():
	print("running target")

#file registration.py
registry = []
def register(func):
    print(f'running register({func})')
    registry.append(func)
    return func
@register
def f1():
    print('running f1()')
@register
def f2():
    print('running f2()')
def f3():
    print('running f3()')
def main():
    print('running main()')
    print('registry ->', registry)
    f1()
    f2()
    f3()
if __name__ == '__main__':
    main()

$python registration.py
running register(<function f1 at 0x100631bf8>)
running register(<function f2 at 0x100631c80>)
running main()
registry -> [<function f1 at 0x100631bf8>, <function f2 at 0x100631c80>]
running f1()
running f2()
running f3()

>>> import registration
running register(<function f1 at 0x10063b1e0>)
running register(<function f2 at 0x10063b268>)
>>> registration.registry
[<function f1 at 0x10063b1e0>, <function f2 at 0x10063b268>]