CODEWITHSUNDEEP
python
Juan Chope
Juan Chope

Reputation:

How can I get only class variables?

I have this class definition:

class cols:
    name = 'name'
    size = 'size'
    date = 'date'
    @classmethod
    def foo(cls):
        print "This is a class method"

With __dict__ I get all class attributes (members and variables). Also there are the "Internal attributes" too (like __main__). How can I get only the class variables without instantiation?

Upvotes: 4

Views: 1456

Answers (2)

Torsten Marek
Torsten Marek

Reputation: 86512

I wouldn't know a straightforward way, especially since from the interpreter's POV, there is not that much of a difference between a method of a class and any other variable (methods have descriptors, but that's it...).

So when you only want non-callable class members, you have to fiddle around a little:

>>> class cols:
...     name = "name"
...     @classmethod
...     def foo(cls): pass

>>> import inspect
>>> def get_vars(cls):
...     return [name for name, obj in cls.__dict__.iteritems()
                if not name.startswith("__") and not inspect.isroutine(obj)]
>>> get_vars(cols)
['name']

Upvotes: 5

Jason Coon
Jason Coon

Reputation: 18431

import inspect
inspect.getmembers(cols)

There are a lot if things you can do with the inspect module: http://lfw.org/python/inspect.html

Upvotes: 1

Related Questions