Python3 中return和yield的区别

class TestYield:
    def gen_iterator(self):
        result_list = []
        for j in range(3):
            print(f"gen_iterator-{j}")
            result_list.append(j)
        # return在循环的外部，待变量完全生成后一次性返回
        return result_list

    def call_gen_iterator(self):
        # 执行下边这句后result_list直接是完成的结果[0,1,2]
        result_list = self.gen_iterator()
        for i in result_list:
            print(f"call_gen_iterator-{i}")

if __name__ == "__main__":
    obj = TestYield()
    obj.call_gen_iterator()

class TestYield:
    def gen_iterator(self):
        for j in range(3):
            print(f"do_something-{j}")
            # yield在for循环内部
            yield j

    def call_gen_iterator(self):
        # yield并不是直接返回[0,1,2]，执行下边这句后result_list什么值都没有
        result_list = self.gen_iterator()
        # i每请求一个数据，才会触发gen_iterator生成一个数据
        for i in result_list:
            print(f"call_gen_iterator-{i}")

if __name__ == "__main__":
    obj = TestYield()
    obj.call_gen_iterator()

class TestYield:
    def gen_iterator(self):
        for j in range(3):
            print(f"do_something-{j}")
            # yield在for循环内部
            yield j

    def gen_iterator_middle(self):
        print(f"gen_iterator_middle")
        # 返回的是迭代器的句柄，所以加一层return不影响是可以理解的
        return self.gen_iterator()

    def call_gen_iterator(self):
        # yield并不是直接返回[0,1,2]，执行下边这句后result_list什么值都没有
        result_list = self.gen_iterator_middle()
        # i每请求一个数据，才会触发gen_iterator生成一个数据
        for i in result_list:
            print(f"call_gen_iterator-{i}")

if __name__ == "__main__":
    obj = TestYield()
    obj.call_gen_iterator()