Classes as namespaces in python

0_usage.py

class checks(namespace):
    immutable = lambda old_value, new_value: old_value == new_value

    def gte(other):
        if callable(other):
            return lambda value: value >= other()
        else:
            return lambda value: value >= other


# These are plain functions:

checks.immutable
checks.gte(0)
checks.gte(datetime.now)

1_implementation.py

class namespace_meta(type):
    def __new__(cls, name, bases, attrs):
        attrs = dict((name, staticmethod(value) if callable(value) else value)
                     for name, value in attrs.items())
        return super(namespace_meta, cls).__new__(cls, name, bases, attrs)

class namespace(object):
    __metaclass__ = namespace_meta

2_alt_implementation.py

from funcy import walk_values, iffy

class namespace_meta(type):
    def __new__(cls, name, bases, attrs):
        attrs = walk_values(iffy(callable, staticmethod), attrs)
        return super(namespace_meta, cls).__new__(cls, name, bases, attrs)