如何确定python脚本是作为模块导入还是作为脚本运行? [英] how do I determine whether a python script is imported as module or run as script?

问题描述

这个问题很简单，但没有通过搜索回答.如何在python脚本中确定此脚本是作为模块导入还是作为脚本运行? python有什么区别吗?

The question is rather straightforward but not answered by searching. How do I determine in a python script whether this script is imported as a module or run as a script? Is there a difference at all in python?

问题是，仅当作为脚本运行时，我才想评估命令行参数，如果仅导入模块以在另一个脚本中使用它，则不希望. (我希望能够同时使用一个脚本作为库和程序.)恐怕最有效的方法是建立lib和使用它的第二个脚本，但是我想为小型工具提供第二个选择. /libs.

The problem is, that I want to evaluate the command line parameters only if run as a script, but not if the module is only imported to use it in another script. (I want to be able to use one script as both library and program.) I am afraid the vanilla way would be to build the lib and a second script that uses it, but I'd like to have a second option for small tool/libs.

推荐答案

来自python 文档:

使用以下命令运行Python模块时

When you run a Python module with

python fibo.py

python fibo.py

模块中的代码将为 被执行，就像您导入它一样 但__name__设置为 "__main__".这意味着通过添加 此代码在您的模块末尾:

the code in the module will be executed, just as if you imported it, but with the __name__ set to "__main__". That means that by adding this code at the end of your module:

if __name__ == '__main__':
    # Running as a script

您可以将文件用作脚本以及可导入的模块，因为解析命令行的代码仅在将模块作为主"文件执行时才运行

you can make the file usable as a script as well as an importable module, because the code that parses the command line only runs if the module is executed as the "main" file

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