python实用代码片段收集贴

获取一个类的所有子类
代码如下:
def itersubclasses(cls, _seen=None):
    """Generator over all subclasses of a given class in depth first order."""
    if not isinstance(cls, type):
        raise TypeError(_('itersubclasses must be called with '
                          'new-style classes, not %.100r') % cls)
    _seen = _seen or set()
    try:
        subs = cls.__subclasses__()
    except TypeError:   # fails only when cls is type
        subs = cls.__subclasses__(cls)
    for sub in subs:
        if sub not in _seen:
            _seen.add(sub)
            yield sub
            for sub in itersubclasses(sub, _seen):
                yield sub

简单的线程配合
代码如下:
import threading
is_done = threading.Event()
consumer = threading.Thread(
    target=self.consume_results,
    args=(key, self.task, runner.result_queue, is_done))
consumer.start()
self.duration = runner.run(
        name, kw.get("context", {}), kw.get("args", {}))
is_done.set()
consumer.join() #主线程堵塞，直到consumer运行结束

多说一点，threading.Event()也可以被替换为threading.Condition()，condition有notify(), wait(), notifyAll()。解释如下：
代码如下:
The wait() method releases the lock, and then blocks until it is awakened by a notify() or notifyAll() call for the same condition variable in another thread. Once awakened, it re-acquires the lock and returns. It is also possible to specify a timeout.
The notify() method wakes up one of the threads waiting for the condition variable, if any are waiting. The notifyAll() method wakes up all threads waiting for the condition variable.
Note: the notify() and notifyAll() methods don't release the lock; this means that the thread or threads awakened will not return from their wait() call immediately, but only when the thread that called notify() or notifyAll() finally relinquishes ownership of the lock.

代码如下:
# Consume one item
cv.acquire()
while not an_item_is_available():
    cv.wait()
get_an_available_item()
cv.release()
# Produce one item
cv.acquire()
make_an_item_available()
cv.notify()