Python function destruction

# function Destroy
# Global Function Destruction
#   redefine function with the same name
#   del statement Delete function object
#   at the end of the program
def foo (xyz=[], u= ' abc ', Z=123):
    Xyz.append (1)
    return XYZ
Print (ID (foo))

def foo (xyz=[]):
    Xyz.append (1)
    return XYZ
Print (foo)        # foo function ID changed, last foo function waiting for garbage collection

del foo
Print (ID (foo))

# Local Function Destruction
#   re-define a function with the same name in the ancestor scope
#   del statement Delete function object
#   When a parent scope is destroyed
def foo (xyz=[], u= ' abc ', Z=123):
    Xyz.append (1)
    def inner (a=10):
        Pass
    Print (ID (inner))
    def inner (a=100):
        Print (XYZ)
    Print (ID (inner))
    return inner

bar = foo ()
Print (ID (foo), ID (bar), foo.__defaults__, bar.__defaults__)
Del Bar
Print (ID (foo), ID (bar), foo.__defaults__, bar.__defaults__)

Python function Destruction