避免使用类继承python进行代码重复

Question

我正在寻找一个避免代码重复的好解决方案，我的代码看起来像这样;

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)

Answer 1

E.g。像这样：

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 ()

输出：

e1
some code

e2
some code
some more code