import pdb

def tag(token):
    def wrap(f):
        def inner():
            print('<{}>'.format(token))
            result = f()
            print('</{}>'.format(token))
            return result
        return inner
    return wrap

@tag('test')
def foo():
    print('hello world')
    return "Value"
    
if __name__ == '__main__':
    print(foo())
    print(foo())
    print(foo())