python3 队列的简单用法

# coding:utf-8
from multiprocessing import Queue


q = Queue(3)  # 创建一个队列对象,队列长度为3
q.put(1)
q.put(2)
# q.put(3)
# q.put(4)  # 当队列已满,继续放值,,会阻塞程序
try:
    q.put_nowait(4)
except:
    print("队列已经满了.")

print(q.get())
print(q.get())
print(q.get())
# print(q.get())  # 当队列空了,继续取值,也会阻塞程序
try:
    q.get_nowait()
except:
    print("队列已经空了.")
    
    
# 1
# 2
# 4
# 队列已经空了.