framework.py

def framework():
    pipeline = []

    register = lambda test, handler: pipeline.append((test, handler))

    def processing(*args):
        for test, handler in pipeline:
            tested = test(*args)
            if tested is not False:
                return handler(*args)

    return register, processing

# use

register, hander = framework()


def sign(test):
    def wrap(f):
        register(test, f)
        return f
    return wrap


@sign(lambda x: x % 2)
def odd(x):
    print(x)

for i in range(10):
    handler(i)