[Python] How can I delete an instance of a class within that class?

I want to know how you can delete a instance within the class. I am trying del self, but it doesn't seem to work. Here's my code:

class Thing:

def __init__(self):
self.alive = True
self.age = 0

def update(self):
self.age += 1

def kill(self):
if self.age >= 10:
del self

def all(self):
self.update()
self.kill()

things = []

for i in range(0, 10):
thing.append(Thing())

while True:
for thing in things:
thing.all()


I specifically want to delete the instance inside the class. I have also replaced del self with self = None, but this statement doesn't seem to have any effect. How can I do this?

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