简体   繁体   中英

referencing static methods from class variable

I know it's wired to have such a case but somehow I have it:

class foo
  #static method
  @staticmethod
  def test():
    pass

  # class variable
  c = {'name' : <i want to reference test method here.>}

What's the way to it?

Just for the record:

I believe this should be considered as python worst practices. Using static methods is not really pythoish way if ever...

class Foo:
    # static method
    @staticmethod
    def test():
        pass

    # class variable
    c = {'name' : test }

The problem is static methods in python are descriptor objects. So in the following code:

class Foo:
    # static method
    @staticmethod
    def test():
        pass

    # class variable
    c = {'name' : test }

Foo.c['name'] is the descriptor object, thus is not callable. You would have to type Foo.c['name'].__get__(None, Foo)() to correctly call test() here. If you're unfamiliar with descriptors in python, have a look at the glossary , and there's plenty of docs on the web. Also, have a look at this thread , which seems to be close to your use-case.

To keep things simple, you could probably create that c class attribute just outside of the class definition:

class Foo(object):
  @staticmethod
  def test():
    pass

Foo.c = {'name': Foo.test}

or, if you feel like it, dive in the documentation of __metaclass__ .

The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.

 
粤ICP备18138465号  © 2020-2024 STACKOOM.COM