带延迟调用函数的Python装饰器

Question

为什么这段代码不工作呢？

from threading import Timer

def delayed(seconds):
    def decorator(f):
        def wrapper(*args, **kargs):
            Timer(seconds, f, args, kargs)
        return wrapper
    return decorator

@delayed(1)
def foo():
    '''this function does not return'''
    print('foo')

foo()
print('dudee')

我期待得到这个结果： dudee foo

但我只得到了 dudee

Answer 1

因为你没有启动你的计时器，可以试试这样：

from threading import Timer

def delayed(seconds):
    def decorator(f):
        def wrapper(*args, **kargs):
            t = Timer(seconds, f, args, kargs)
            t.start()
        return wrapper
    return decorator

@delayed(1)
def foo():

    print('foo')

foo()
print('dudee')