Decorator

gistfile1.py

#一个简单的装饰器
def require_int(foo):
    def re(arg):
        if type(arg)==int:
            return foo(arg)
        else :
            raise 'The arg must int'
    return re

@require_int
def get_int(arg):
    return 'the arg is {0}'.format(arg)


get_int(1)
#ok
get_int(20)
#ok
get_int('test')
#error