# file: a.py
import b
class classproperty(object):
    def __init__(self, f):
        self.f = f
    def __get__(self, obj, owner):
        return self.f(owner)

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



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

# file : b.py
import a

class settings(a.settings):
    local_path = 'local'


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