Python的with:一出手,异常就跪了,代码直接起飞
异常中的 with 关键字错误和异常被用于异常处理的 with 语句, 对 try……模式进行了封装, 提升了易用性。对于文件流以及各种公共资源的管理状况而言, with语句能够让那份代码, 达到一种更加清晰的状态, 并且处于一种更具可读性的状况, 它还简化了这些情况。在处理文件对象时使用 with 关键字是一种很好的做法。我们可以看下以下几种代码实例不使用 with也不使用 try……在调用write的过程当中, 若是出现了异常, 那么close方法便无法被执行, 所以资源将会一直被该程序占用, 进而无法被释放, 以上代码便是如此。更多 with 关键字参考接下来我们呢可以使用 try…… 来改进代码针对以上那些代码, 在代码里可能会出现引起异常的地方, 我们运用try去进行捕获, 当出现异常状况的时候, 就会去执行相应代码块, 这个代码块不管是处于何种情形之下, 都是会被执行的, 所以文件就会被关闭, 不会因为异常发生没能正常执行而导致占用资源。使用 with 关键字当使用with关键字时, 系统会自动去调用f.close()方法, with所起的作用, 和try语句是等效的这样一种情况。我们可以在执行 with 关键字后检验文件是否关闭with 语句实现原理建立在上下文管理器之上。上下文管理器是一个实现 和 方法的类。使用 with 语句确保在嵌套块的末尾调用 方法。这个概念类似于 try... 块的使用。以上所举的例子, 把 hello world! 书写到了 ./.txt 这个文件之上。在文件对象里头定义了, 和方法这件事情, 也就是说文件对象达成了上下文管理器, 先是调用, 这个方法, 接着执行with语句当中的代码, 最后调用, 表示的方法。哪怕出现了错误, 也都会去调用, 表示的方法, 这情形说的就是会关闭文件流。实例给出的这些代码, 属于一个简明的旅行计划管理工具, 它会从名为5A.txt的文件里, 读取城市的列表, 并且还能提供如下的功能读取城市列表, 从文件里读取城市名称, 该城市名称是以数字作为开头的, 而后将其添加到旅游计划的列表当中。去删除城市, 用户能够去输入不想前往的城市数量, 以及其对应的序号, 进而把那相应的城市于计划里给删除掉。修改城市用户可以选择修改某些城市的名称更新旅游计划。打乱城市的顺序, 生成随机旅游计划, 将前五个被打乱顺序后的城市显示出来, 作为最终的旅游推荐。5A.txt 文件每行包含一个以数字开头的城市名称1. 北京 2. 上海 3. 广州 4. 深圳 5. 成都 6. 杭州 7. 西安 8. 重庆 9. 南京 10. 苏州执行以上代码输出结果类似如下旅游计划城市 [0# 北京, 1# 上海, 2# 广州, 3# 深圳, 4# 成都, 5# 杭州, 6# 西安, 7# 重庆, 8# 南京, 9#. 苏州] 输入不想旅游城市的个数:0 输入修改计划旅游的城市个数:3 输入修改计划旅游的城市序号第1个城市索引为04 输入修改计划旅游的城市名称:7 旅游计划城市 [0# 北京, 1# 上海, 2# 广州, 3# 深圳, 7, 5# 杭州, 6# 西安, 7# 重庆, 8# 南京, 9#. 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