Python3基础 yield send 变量名= yield i

   Python : 3.7.3

   OS : Ubuntu 18.04.2 LTS

  IDE : pycharm-community-2019.1.3

Conda : 4.7.5

typesetting : Markdown

code

"""

@Author : 行初心

@Date   : 2019/7/6

@Blog   : www.cnblogs.com/xingchuxin

@Gitee  : gitee.com/zhichengjiu

"""

def yield_test():

    # next() 遇到yield会停止，保存数据并返回后面的数值

    a = 1

    send_value = yield a

    print(send_value)

    a += 1

    send_value = yield a

    print(send_value)

    a += 1

    send_value = yield a

    print(send_value)

    a += 1

    send_value = yield a

    print(send_value)

    a += 1

    send_value = yield a

    print(send_value)

def main():

    generator = yield_test()

    # print后面的 \n 可加的有意义

    # 想理解好 send 的功能，建议使用 Debug - Step Into(F7)。一步一步地跟下来

    print(generator.__next__(), "\n")

    # send(None) <-> __next__()

    print(generator.send(None), "\n")

    print(generator.__next__(), "\n")

    # 主要看，send 传值啦

    print(generator.send("pythoneer"), "\n")

    print(generator.send("hello world"), "\n")

if __name__ == '__main__':

    main()

result

/home/coder/anaconda3/envs/py37/bin/python /home/coder/PycharmProjects/NumericalComputation/demo.py

1 

None

2 

None

3 

pythoneer

4 

hello world

5 

Process finished with exit code 0

source_code

class Generator(Iterator[_T_co], Generic[_T_co, _T_contra, _V_co]):

    @abstractmethod

    def __next__(self) -> _T_co: ...

    @abstractmethod

    def send(self, value: _T_contra) -> _T_co: ...

    @abstractmethod

    def throw(self, typ: Type[BaseException], val: Optional[BaseException] = ...,

              tb: Optional[TracebackType] = ...) -> _T_co: ...

    @abstractmethod

    def close(self) -> None: ...

    @abstractmethod

    def __iter__(self) -> Generator[_T_co, _T_contra, _V_co]: ...

    @property

    def gi_code(self) -> CodeType: ...

    @property

    def gi_frame(self) -> FrameType: ...

    @property

    def gi_running(self) -> bool: ...

    @property

    def gi_yieldfrom(self) -> Optional[Generator]: ...

resource

[文档 - English] docs.python.org/3
[文档 - 中文] docs.python.org/zh-cn/3
[规范] www.python.org/dev/peps/pep-0008
[规范] zh-google-styleguide.readthedocs.io/en/latest/google-python-styleguide/python_language_rules
[源码] www.python.org/downloads/source
[ PEP ] www.python.org/dev/peps
[平台] www.cnblogs.com
[平台] gitee.com

Python具有开源、跨平台、解释型、交互式等特性，值得学习。

Python的设计哲学：优雅，明确，简单。提倡用一种方法，最好是只有一种方法来做一件事。

代码的书写要遵守规范，这样有助于沟通和理解。

每种语言都有独特的思想，初学者需要转变思维、踏实践行、坚持积累。

巴特西

Python3基础 yield send 变量名= yield i

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result

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