麦克斯甜点屋
问题描述
我有一个类似这样的生成器函数:
I have a generator function that goes something like this:
def mygenerator():
next_value = compute_first_value() # Costly operation
while next_value != terminating_value:
yield next_value
next_value = compute_next_value()
我希望在调用函数后立即运行初始化步骤(在 while 循环之前)，而不是仅在第一次使用生成器时运行.有什么好的方法可以做到这一点?
I would like the initialization step (before the while loop) to run as soon as the function is called, rather than only when the generator is first used. What is a good way to do this?
我想这样做是因为生成器将在单独的线程(或进程，或任何多处理使用)中运行，并且我不会在短时间内使用 return，而且初始化有点昂贵，所以我希望它在我准备使用这些值时进行初始化.
I want to do this because the generator will be running in a separate thread (or process, or whatever multiprocessing uses) and I won't be using the return for a short while, and the initialization is somewhat costly, so I would like it to do the initialization while I'm getting ready to use the values.
推荐答案
class mygenerator(object):
def __init__(self):
next_value = compute_first_value()
def __iter__(self):
return self
def next(self):
if next_value == terminating_value:
raise StopIteration()
return next_value
