If I changed the function name in a class, what happen to the function?

Consider the following codes

class Bank_acount:
    def password(self):
        return 'code:123'

Now consider a few cases when executing the class as below

denny = Bank_acount()
denny.password()            # function call

>> 'code:123'

Next

denny.password             # password is function name
 
>> "bound method Bank_acount.password of <__main__.Bank_acount object at 0x00000167820DDCA0>>"

Now if I changed the function name

denny.password = 'code:456'     # I changed the function name

I got

denny.password

>> 'code:456'

However,

denny.password()

>>TypeError: 'str' object is not callable

I am confused

1. denny.password = 'code:456' does not make any change to return 'code:123' in the original class, right?
2. Has the original method password(self) been destroyed?
3. After changing the function name, a new function code:456() pops out?

Thanks!

>Solution :

Has the original method password(self) been destroyed?

The method still exists, but it has been shadowed by another value only for the denny instance.

a new function code:456() pops out?

It’s not a function; as the error says, strings are not callable

You can change the code with a separate attribute, not by a function change

class Bank_acount:
    def __init__(self, code):
        self.code = code
    def password(self):
        return 'code:' + str(self.code) 

denny = Bank_acount(123)
print(denny.password())
denny.code = 456
print(denny.password())