[Python] Mocking a local variable of a function in python

I am new to mock and unit testing in python. How can I mock the local variable of a function? For example, how do I change age to 10 instead of 27 while testing?

# data_source.py
def get_name():
age = 27 #real value
return "Alice"

# person.py
from data_source import get_name

class Person(object):
def name(self):
return get_name()

# The unit test
from mock import patch
from person import Person

@patch('person.age')
def test_name(mock_age):
mock_age = 10 # mock value
person = Person()
name = person.name()
assert age == 10

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