函式參數為物件
將物件傳入函式，內容會改變。
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class Person:
name = None
age = None
def __init__(self, name, age):
self.name = name
self.age = age
def change(person):
person.name = "Mary"
person.age = 10
p1 = Person("Bill", 20)
print(f"p1 name = {p1.name}, age = {p1.age}")
change(p1)
print(f"p1 name = {p1.name}, age = {p1.age}")
p1 name = Bill, age = 20
p1 name = Mary, age = 10
函式參數指向None
將物件傳入函式，並把它的記憶體位址變成None，不會影嚮外部的物件。
完整程式碼
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class Person:
name = None
age = None
def __init__(self, name, age):
self.name = name
self.age = age
def change(person):
# person 指向 None
person = None
p1 = Person("Bill", 20)
print(f"p1 name = {p1.name}, age = {p1.age}")
change(p1)
print(f"p1 name = {p1.name}, age = {p1.age}")