annotation.py

#!/usr/bin/env python
# -*- encoding:utf-8 -*-

def range(**ranged):
    def arged(f):
        def ret(*argv, **d):
            minv = ranged['min']
            maxv = ranged['max']
            print('*** range check. min: {0}, max: {1} ***'.format(minv, maxv))
            for a in argv:
                if a < minv:
                    print('-> lower')
                elif a > maxv:
                    print('-> exceed')
                else:
                    print('-> valid')
            f(*argv, **d)
        return ret
    return arged

def notnone(f):
    def ret(*argv, **d):
        for a in argv:
            if a is None:
                raise ValueError('is None')
        print('None check passed')
        f(*argv, **d)
    return ret

@range(min=5, max=8)
def hoge(i):
    print('hoge called with {0}'.format(i))

@notnone
def fuga(a):
    print(a)


if __name__ == '__main__':
    hoge(5)
    hoge(3)
    hoge(9)
    fuga(123)
    fuga('hoge')
    fuga(None)