生成器

# 打印斐波那契数列
def create_num(all_num):
    a, b = 0, 1
    current_num = 0
    while current_num < all_num:
        # print(a)
        # 生成器，如果一个函数中有yield,那么这个函数就不再是函数，就是一个生成器模板
        yield a
        a, b = b, a + b
        current_num += 1


# 如果在调用create_num的时候，发现这个函数中有yield那么此时，不是调用函数，而是创建一个生成器
obj = create_num(10)
ret = next(obj)
print(ret)
ret = next(obj)
print(ret)
# 生成器是一种特殊的迭代器
for num in obj:
    # print(num)
    pass

E:\python_project\NetWork\venv\Scripts\python.exe E:/python_project/NetWork/协程/生成器.py
0
1

Process finished with exit code 0

使用send方式

# 打印斐波那契数列
def create_num(all_num):
    a, b = 0, 1
    current_num = 0
    while current_num < all_num:
        # print(a)
        # 生成器，如果一个函数中有yield,那么这个函数就不再是函数，就是一个生成器模板
        ret=yield a
        print("yield接收send的值：",ret)
        a, b = b, a + b
        current_num += 1


# 如果在调用create_num的时候，发现这个函数中有yield那么此时，不是调用函数，而是创建一个生成器
obj = create_num(10)
ret = next(obj)
print(ret)
# 可以传参数
ret = obj.send("sssss")
print(ret)
# 生成器是一种特殊的迭代器
# for num in obj:
    # print(num)
    # pass

E:\python_project\NetWork\venv\Scripts\python.exe E:/python_project/NetWork/协程/生成器.py
0
yield接收send的值： sssss
1

Process finished with exit code 0

使用yield 完成多任务

import time


def task_1():
    while True:
        print("task1")
        time.sleep(1)
        yield


def task_2():
    while True:
        print("task2")
        time.sleep(1)
        yield


def main():
    t1 = task_1()
    t2 = task_2()
    while True:
        next(t1)
        next(t2)


if __name__ == "__main__":
    main()

E:\python_project\NetWork\venv\Scripts\python.exe E:/python_project/NetWork/协程/使用yield完成多任务.py
task1
task2
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Process finished with exit code -1