python - Use methods of parent class A from parent class B -


i have class a:

class a(object):    def pprint(x):        print(x)

then have class b:

class b(object):     def pprint(x):         x += 1         # find way call a.pprint(x)

then have child class:

class child(b, a):     pass

which should used:

child = child() child.pprint(1) >>> 2

i can make changes b not a. cannot refer directly in b. b never instantiated directly, via children class.

after explanation - need not super() need sibling_super() find next class in multiple inheritance chain. can poll python's mro that, example:

class a(object):      def pprint(self, x):  # make valid, assuming valid in real code         print(x)  class b(object):      @staticmethod     def sibling_super(cls, instance):         mro = instance.__class__.mro()         return mro[mro.index(cls) + 1]      def pprint(self, x):         x += 1         self.sibling_super(b, self).pprint(self, x)  class child(b, a):     pass  child = child() child.pprint(1)  # 2

Comments

Post a Comment

Popular posts from this blog

php - Vagrant up error - Uncaught Reflection Exception: Class DOMDocument does not exist -

i've set bento/ubuntu-16.04 vagrant box using php 5.6, , getting following error quite few times when try , run shell script: "uncaught reflection exception: class domdocument not exist". i've tried adding following top of script (not together), each no success: "sudo apt-get install php5.6-xml", "sudo apt-get install php5-xml", "sudo apt-get install php-dom" i've tried resetting server "sudo service apache2 restart". does have suggestions?
Read more

vue.js - Create hooks for automated testing -

Image
qa guys complained can't automate frontend testing. because our html looks same outside. lazy hack did this <template> <div :role="$options.name"> ... </div> </template> <script> export default { name: 'vmcomponentname' } </script> which takes name script , applies html. in browser get: <div role="vmcomponentname"> ... </div> line :role="$options.name" goes in every component. is there dry er solutions? please share. additional details i'll explain in details looking for. imagine have vmusercreate form creates user. test case can create user . to automatically test without role, have use following selector: .wrapper > .wrapper > .wrapper > .submit-button the test extremely brittle (will break lot). if use roles can use [role="vmusercreateform"] .submit-button selector. many folds less brittle. so basically, i'm ...
Read more

Add new key value to json node in java -

i have json file : { "id":1, "name":"abc", "addressdetails": { "city":"newyork" } } i wanted add 1 more key-value ("pincode" : "414141") node 'addressdetails'. i tried using : objectmapper mapper = new objectmapper(); jsonnode root = mapper.readtree(new file("d://test.json")); objectnode node = mapper.createobjectnode(); node.with("addressdetails").put("pincode", "414141"); but it's not getting added, there way can ? you can try you should modify file path objectmapper mapper = new objectmapper(); objectnode nodes = mapper.readvalue(new file("d:\\test.txt"), objectnode.class); nodes.with("addressdetails").put("pincode", "414141"); mapper.writer().writevalue(new file("d:\\test.txt"), nodes);
Read more