• Python3基础 yield 在无返回值的函数中的简单示例


    •        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():
        a = 1
        yield a
        # next() 遇到yield会停止,保存数据并返回后面的数值
    
        a += 1
        yield a
    
        a += 1
        yield a
    
        a += 1
        yield a
    
    
    def main():
        generator = yield_test()
    
        # yield_test函数中有四个 yield,这里有四个next。
        print(next(generator))
        print(next(generator))
        print(next(generator))
        print(next(generator))
    
        # 写第五个
        # print(next(generator))
        # 会抛出 StopIteration 异常
    
    
    if __name__ == '__main__':
        main()
    
    

    result

    /home/coder/anaconda3/envs/py37/bin/python /home/coder/PycharmProjects/NumericalComputation/demo.py
    1
    2
    3
    4
    
    Process finished with exit code 0
    
    

    source_code

    def next(iterator, default=None): # real signature unknown; restored from __doc__
        """
        next(iterator[, default])
        
        Return the next item from the iterator. If default is given and the iterator
        is exhausted, it is returned instead of raising StopIteration.
        """
        pass
    

    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。

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  • 原文地址:https://www.cnblogs.com/xingchuxin/p/11142689.html
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