def f():
? ?print('call f()...')

? ?# 定義函數(shù)g:
? ?def g():
? ? ? ?print('call g()...')

? ? ? ?# 定義函數(shù)h：
? ? ? ?def h():
? ? ? ? ? ?print('call h()...')

? ? ? ?# 返回函數(shù)h：
? ? ? ?return h

? ?# 返回函數(shù)g:
? ?return g


x = f()
print(x)
y = x()
print(y)
z = y()
print(z)

>>> <function f.<locals>.g at 0x0000020E584749A0>

>>>?call g()...

>>>?<function f.<locals>.g.<locals>.h at 0x0000020E58474F40>

>>>?call h()...

>>>?None

為什么z作為返回函數(shù)h的對象，卻沒有地址呢？