decorator_cached_property_refresh.py

from cached_property import cached_property

class Monopoly(object):

    def __init__(self):
        self.boardwalk_price = 500

    @cached_property
    def boardwalk(self):
        # Again, this is a silly example. Don't worry about it, this is
        #   just an example for clarity.
        print("======hello world======")
        self.boardwalk_price += 50
        return self.boardwalk_price

monopoly = Monopoly()
monopoly.boardwalk
monopoly.boardwalk

# cached_property will save the calculated result in __dict__
# you can delete the value in __dict__, and call method again to refesh it
del monopoly.__dict__["boardwalk"]
monopoly.boardwalk