Avoid code duplication with class inheritance python

Question

I’m looking for a nice solution to avoid code duplication, my code look like this;

class HostEnvironment(AbstractEnvironment):

    def provision(self, wait_for_sshd=True):

        some code

    def __init__(self, layer_info):

        pass

class VCBEnvironment(HostEnvironment):

    def provision(self, wait_for_sshd=True):

        same code

        plus some more code

    def __init__(self, layer_info):
        super(VCBEnvironment, self).__init__(layer_info)

You are already using super() in the __init__ method. Why can't you use that instead of same code in VCBEnvironment.provision() exactly? — Martijn Pieters
– Martijn Pieters, Commented Jun 30, 2015 at 7:44
@MartijnPieters: He might not know that super can be used for methods besides the __init__ method. — Sandy Chapman
– Sandy Chapman, Commented Jun 30, 2015 at 18:21

Jacques de Hooge · Accepted Answer · 2015-06-30 07:56:38Z

1

E.g. like this:

class AbstractEnvironment:
    pass

class HostEnvironment (AbstractEnvironment):
    def __init__ (self, layer_info):
        pass

    def provision (self, wait_for_sshd = True):
        print 'some code'

class VCBEnvironment (HostEnvironment):
    def __init__(self, layer_info):
        HostEnvironment.__init__ (self, layer_info)

    def provision (self, wait_for_sshd = True):
        HostEnvironment.provision (self, wait_for_sshd)
        print 'some more code'

print '\ne1'
e1 = HostEnvironment (None)
e1.provision ()

print '\ne2'
e2 = VCBEnvironment (None)
e2.provision ()

Output:

e1
some code

e2
some code
some more code

answered Jun 30, 2015 at 7:56

Jacques de Hooge

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