second instance with same name and type as previously created instance attributes are not intialized

Asked Jun 09 '20 at 01:32

Active Jun 09 '20 at 01:32

Viewed 8 times

I have a class Household

class Household:
    def __init__(self,A=[]):

        self._A = A
    @property
    def A(self):
        """List of firms connected to by type A"""
        return self._A

    @A.setter
    def A(self, value):
        self._A = value

h = Household()
h.A.append(4)

h = Household()
h.A

I thought this should return empty list []. But instead I get [4]. Why?

asked Jun 09 '20 at 01:32

MaxYarmolinsky

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I mean obviously I am creating a name collision here, I didn't intend to do that – MaxYarmolinsky Jun 09 '20 at 01:36
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It's not a name collision, check the duplicate question for a thorough explanation. – Selcuk Jun 09 '20 at 01:37
1

Note, your `property` is completely pointless, don't use it it defeats the *entire point*. Just use a regular attribute – juanpa.arrivillaga Jun 09 '20 at 01:46
why is it pointless? I need this attribute to be a list – MaxYarmolinsky Jun 09 '20 at 01:47
It's ok to publicly expose the attribute `A` in Python. You are most likely coming from a different language (such as Java) where getters and setters are the norm even if they do nothing (as in your example). – Selcuk Jun 09 '20 at 01:49
oh I see thanks ok im good thanks – MaxYarmolinsky Jun 09 '20 at 01:50

second instance with same name and type as previously created instance attributes are not intialized

0 Answers0