Python - class object attribute setter not working

Question

I've got a simple class setup here. What I want to happen is the 'print message' to be printed when I set the attribute 'info' of the class object Truck.

Nothing appears to be happening when I set the info property c.info = "Great" I would expect it to print "this is being set"

# Classes
class Node(object):
    def __init__(self, name, age):
        self.name = name
        self.age = age

class Truck(Node):
    def __init__(self, name="", age=0):
        super(Truck, self).__init__(name=name, age=age)
        self.info = None

        @property
        def info(self):
            return self.info

        @info.setter
        def info(self):
            print "this is being set"


c = Truck()
c.info = "great"
print c.info

Edit the question to fix the indenting so we know not to worry about that any more. — tdelaney
– tdelaney, Commented Dec 1, 2015 at 20:28
"nothing appears to be happening"... your code raises a ValueError and that's an interesting bit of information to include in the question. — tdelaney
– tdelaney, Commented Dec 1, 2015 at 20:34

Mike Müller · Accepted Answer · 2015-12-01 20:28:48Z

The setterneeds to take a value. Furthermore, store the data in self._info to avoid recursive calls to self.info().

class Node(object):
    def __init__(self, name, age):
        self.name = name
        self.age = age

class Truck(Node):
    def __init__(self, name="", age=0):
        super(Truck, self).__init__(name=name, age=age)
        self._info = None

    @property
    def info(self):
        return self._info

    @info.setter
    def info(self, value):
        # you likely want to it here
        self._info = value
        print("this is being set")


c = Truck()
c.info = "great"
print(c.info)

This prints:

this is being set
great

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