Call method when variable is changed

Question

I have a variable which is a list, which contains a large number of people in it. something like:

'citizens = ['John', 'Jack', 'Jill', 'Jonas']`
#imagine hundreds of names

I would like to 'link' a variable, population to the length of this list, so that whenever the list is modified, the population variable will update. Up until now, I have been simply calling a function like so:

def update_population()
    global population
    population = len(citizens)

but is seems like there would be a more elegant solution, so this can be automatically triggered without my explicitly calling it.

You want a class that has a citizens field and a population method decorated with @property. — senshin
– senshin, Commented Dec 7, 2015 at 2:13

101 · Accepted Answer · 2015-12-07 02:13:07Z

4

If this is in a class somewhere, then you could make a it a property, e.g.

@property
def population(self):
    return len(self.citizens)

answered Dec 7, 2015 at 2:13

101

9,0676 gold badges47 silver badges71 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Call method when variable is changed

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related