如何在多个产出函数中实现一个产出

def generator1():
    yield '产出1'

def generator2():
    yield '产出2'

def generator3():
    yield '产出3'

def combined_generator():
    yield from generator1()
    yield from generator2()
    yield from generator3()

# 使用combined_generator函数来产生序列的值
for value in combined_generator():
    print(value)

产出1
产出2
产出3