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Python中if name == main:的妙用

发布时间：2026/10/11 2:55:49

Python中if name == main:的妙用 尽管并没有传统意义上的main函数, 可是能够借助if :达成与之相类似的功能。1、 在执行进程当中, hello.py的首行print(first)会即刻运行, 与此同时该文件里的变量值是hello而于world.py之中, 其值显示成, 这表明它作为主程序入口来运行, 两者鉴于调用方式不一样致使值存有差别。2、 许多才刚开始学习的人, 在阅读代码之际, 常常会习惯性地去寻觅main()函数, 把它当成程序的起始点, 觉得程序就会从这儿开始运行。然而事实上, 并没有如其他编程语言里那种严格意义的main()方法。虽说我们常常见到if :这样的语句, 还把它看作程序的入口, 类似Java里的main函数, 可这种理解并非全然精准。它的执行机制是从上面到下面逐行去运行代码的。一个.py文件里, 所有不在函数定义def之内的代码, 在脚本运行之际会马上执行, 恰似直接写于主程序里边的内容。所以, 要是你仅仅想输出一个简易的hello world, 只写一行print(hello world)便足够了, 这本身就是一个完整的可运行程序, 不需要任何特殊的入口函数。可是, 当你编写的是含有多个函数的模块, 并且期望在单独运行此文件时予以测试, 那就得运用if :这个结构。它可以保证, 只有在该文件被直接执行的情况下, 其下面的代码才会运行然而当把它导入作为模块时, 这一部分的内容是不会执行的。举例来说, 可以试想, 如果再有一个名为hello, py的文件存在, 那么就可以试着把测试代码放到这个判断语句的下方, 这样一来, 不但能够确保模块的复用性得以实现, 而且也能够达成于独立运行时实现所有的独立功能验证这样复杂的目标。3、 执行输出4、 你是否能领会我的意思, 程序会率先去执行第一行的print语句, 接着才会步入那被称作入口部分的区域。那么, if 这句话究竟有着怎样的含义, 实际上, 算得上是 里一个内置的特别变量, 它是用来展现当前模块的运行模式的。当直接运行某个.py文件时, 就像hello.py这样, 该文件里所有的 值都会被设定为 。所以, if条件成立, 其底下的代码块就会被执行, 这一部分通常是被叫做程序的主入口。然而要是这个被称谓 hello.py 的内容被当作模块引入到另外一个文件里, 像 world.py 这种情况, 而你实际去运行的是 world.py这件事, 那么在导入这个行为的进程当中, hello.py 里边的相关内容就不再等同于之前的状态, 而是等于模块的名称 hello 了。如此弄来, if 判断这里就没办法成立了, 主入口那里边儿的代码也就不会去运行了。这就好比是借助条件判断的方式, 很巧妙地仿效出了一个 main 函数的那种效果。需要留意的是, 代码是依照一定顺序一行一行去执行的。所以, 在程序读取遇见 hello 这条语句之际, 它会马上加载并且去执行整个 hello.py 文件之中涵盖在内的所有那些可被执行的代码, 这其中就得包括里面的 print 语句之类的。这就构成那甚解为何哪怕仅仅是进行导入模块的举动, 也极有可能被瞧见一些输出内容的缘由所在。借由这样一番做法, 灵动地区别开来了关于模块的直接得以运行以及将其作被导入进而加以使用的这两种不同场景情况。5、 执行成效6、 启动方式较为灵活存在, 并非像Java那样有着, 用来作为程序入口的main()方法。通常借助if :语句达成, 对程序主执行逻辑进行定义, 当满足条件之际, 运行相应代码, 不然就予以跳过。该结构虽说并非强制要求, 然而遭际广泛运用, 用于区分模块受的状况 乃是被直直运行, 还是导入过去使用, 以此来实现跟主函数相类似的功能。中关村在线没有传统意义上的main函数, 但能借由if :达成类似的功能, 在执行的进程里, hello.py的第一行print(first)会马上运行, 与此同时该文件内部的变量值是hello, 然而在world.py中, 其值呈现为 , 这意味着它作为主程序入口在运行, 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Spring Boot超市进销存系统毕设实战：从需求拆解到答辩通关

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很多刚开始接触 Flutter 的朋友，在看完一堆“Hello World”和基础组件之后，大概率都会撞上同一堵墙：StatefulWidget 里那堆 initState、build、dispose 方法，到底什么时候被调用？为什么顺序是那样？在里面到…

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