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python语法记录
class threading.Condition(lock=None)
This class implements condition variable objects. A condition variable allows one or more threads to wait until they are notified by another thread.
If the lock argument is given and not None, it must be a Lock or RLock object, and it is used as the underlying lock.
Otherwise, a new RLock object is created and used as the underlying lock.
也就是说，如果condition构造函数lock参数为空的话，会自动创建可重入锁RLock。
可重入锁RLock，同一线程可以多次获取（the same thread may acquire it again without blocking）。
python语法记录
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