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In Python, the __name__ variable is a built-in variable that identifies the name of the module in which it is defined. This variable is particularly useful for debugging and understanding the structure of your program.
To demonstrate how __name__ works, let's look at some examples:
This script defines a function called printName(), and when executed directly, it will show the current module's name.
这样的情况可能,请看下文。def printName(): print("Example1's __name__ is: " + __name__)
In this file, we import the printName function from demo1.py and execute it within the context of demo2.py. When running this script, the output will differ from the previous example.
import demo1if __name__ == '__main__': printName() print("Example2's __name__ is: " + __name__)
运行上述脚本时,你会看到以下输出:
Example1's __name__ is: demo1
Example2's __name__ is: __main__
这个结果揭示了两件重要事情:
1. 当你在当前文件直接执行代码时,__name__变量将显示当前文件的名称。2. 当你从另一个文件导入函数并在该文件中执行时,__name__变量将显示__main__,这符合Python对模块执行行为的设计原则。In PyCharm, you can right-click on your Python file (e.g., demo2.py) and select "Run demo2.py" from the context menu. This will execute the script and display the results in the console.
Python使用模块化设计来组织代码,其中每个模块可以独立地包含功能。每个模块都有自己的__name__变量,其值取决于该模块如何被调用:
通过以上示例,我们可以清晰地看到__name__变量在不同情况下的行为。理解这一点对于调试和优化你的Python程序是非常重要的。
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