# a.py
import b

print 'my name:', __name__

class classproperty(object):
    def __init__(self, f):
        self.f = f
    def __get__(self, obj, owner):
        return self.f(owner)

print 1
class settings:
    root_path = 'root'
    local_path = ''
    platform = 'pc'
    version = '1.2.7'

    @classproperty
    def path(self):
        return self.root_path + self.platform + self.version + self.local_path

print 2, id(settings)


if __name__ == "__main__":
    print 5
    settings.version    = "2"
    settings.root_path = "____"
    print("called from a: %s" % settings.version)
    b.process()

#b.py
import a

print 3, id(a.settings)
class settings(a.settings):
    local_path = 'local'

print 4

def process():
    print("called from b: %s" % settings.version)
    print(settings.path)