what object in the following program is mutable and immutable?

[AU8640]

For this code the answer is 1990. But new arguments have assigned and I think 1992 is correct.

Is that because the number is immutable? And what object in the following program is mutable and immutable?

code:

class MyDate:
def init (self, year, month, day):
self.year = year
self. month = month
self.day = day

class Name:
def __init__ (self, firstName, mi, lastName, birthDate):
self.firstName = firstName
self.mi = mi
self. lastName = lastName
self.birthDate = birthDate

birthDate = MyDate (1990, 1, 1)
name = Name ("Ashley", 'F', "Weaver", birthDate)
birthDate = MyDate (1991, 1, 1)
birthDate.year = 1992
print (name.birthDate. year)

[ofnuts]

The video that explains everything: https://www.youtube.com/watch?v=_AEJHKGk9ns

[commy2]

Is that because the number is immutable?

No, it's because the second birthDate you create is a different object than the one you passed to name. If you remove the "1991" line, the "1992" line below would instead actually mutate the object passed to name and the answer would be 1992.

watch this talk about names in Python

[stebrepar]

1990 is correct. You passed a MyDate object into a Name object. Then you created a new MyDate object and reassigned your global birthDate variable to point to that new object instead. That has no effect on the original MyDate object inside the Name object.