if __name__ ==

__name__ 是当前模块名,当模块被直接运行时模块名为 __main__ 。这句话的意思就是,当模块被直接运行时,以下代码块将被运行,当模块是被导入时,代码块不被运行。目测有很多人对这个问题理解得不是很深刻,应该大

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5/8/2010 · 当你打开一个.py文件时,经常会在代码的最下面看到if __name__ == ‘__main__’:,现在就来介 绍一下它的作用. 模块是对象,并且所有的模块都有一个内置属性 __name__。一个模块的 __name__ 的值取决于您如何应用模块。

Whenever the Python interpreter reads a source file, it does two things: it sets a few special variables like __name__, and then it executes all of the code found in the file. Let’s see how this works and how it relates to your question about the __name__ checks we

使用方式範例python threading_example.pySee more on stackoverflow這對您是否有幫助?謝謝! 提供更多意見反應

这个问题来自于知乎用户的提问,当时看到这个问题,我只是做了下简单的回答。后来我发现,对于很多人来说,更准确的说应该是大部分的 Python 初学者,对这个问题理解的不是很深刻。所以这里我来做下总结,并试图把这个问题说明白。


Python里的if __name__ == “__main__”是什么意思? 我的意思是它有什么作用,name可以其他东西吗? 是不是有了这个东西,在import的时候就不会运行它后面的东西?顺便问一下,有没有python的中文教程网站?多谢!!! 展开

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(Sponsors) Get started learning Python with DataCamp’s free Intro to Python tutorial. Learn Data Science by completing interactive coding challenges and watching videos by expert instructors. Start Now! Every module in python has a special attribute called [crayon

8/8/2017 · Before executing code, Python interpreter reads source file and define few special variables/global variables. If the python interpreter is running that module (the source file) as the main program, it sets the special __name__ variable to have a value “__main__”. If this file is being imported


The __name__ variable (two underscores before and after) is a special Python variable. It gets its value depending on how we execute the containing script. Sometimes you write a script with functions that might be useful in other scripts as well. In Python, you

作者: Bert Carremans

Python初心者がサンプルコードを見たときに理解に苦しむのが、おまじないのように書かれているif __name__ == ‘__main__’。アンダースコアに惑わされてしまうが「__name__に格納されている値が’__main__’という文字列である場合に以降の処理を実行する」と

Pythonではclass・クラスの使い方を理解するのは基本中の基本です。 クラスを使うことができれば、Pythonで様々なプログラムを書くことができ、幅が広がります。オブジェクト指向言語で

__name__:myModule 所以用 __name__ 就可以分辨我的程式是被 import 當成模組還是被直接執行的。這樣附帶的好處就是如果我寫的程式平常可以被 import 來使用,但有時它自己也可以直接執行。其它語言的話,可能就要區分 library 跟使用 library 的程式,而

if __name__ == ‘__main__’: って何? サンプルコードにも頻出するこの__name__属性。 Pythonを勉強し始めて3日ぐらいのときに一度調べたのだけど「???」な感じだった。 で、きょう今一度調べてみるとやっと理解できた。 Pythonを始めて3日目の自分でも理解

14/4/2004 · Python中if __name__ == ‘__main__’:的作用和原理 if __name__ == ‘__main__’:的作用 一个python文件通常有两种使用方法,第一是作为脚本直接执行,第二是 import 到其他的 python 脚本中被调用(模块重用)执行。因此if __name__ == ‘main’:的作用就是控制这


Se invece stiamo richiamando lo script come modulo da dentro a un altro programma, quindi abbiamo detto per usare funzioni come ad esempio la funzione print_tre_volte(), alla variabile __name__ verrà assegnato il nome dello script, quindi il nome del modulo:

Python里的if __name__ == “__main__”是什么意思? 我的意思是它有什么作用,name可以其他东西吗? 是不是有了这个东西,在import的时候就不会运行它后面的东西?顺便问一下,有没有python的中文教程网

Since there is no main() function in Python, when the command to run a python program is given to the interpreter, the code that is at level 0 indentation is to be executed. However, before doing that, it will define a few special variables. __name__ is one such

You should get in the habit of using this almost always. Anything that comes after if __name__ == ‘__main__’: will be run when you explicitly run your file. python myfile.py However, if you import myfile.py elsewhere: import myfile Nothing under if __name

Python __name__ 原文: Python3 面向对象 像是一个菜鸟 关于 __name__ 首先需要了解 __name__ 是属于 python 中的内置类属性,就是它会天生就存在与一个 python 程序中,代表对应程序名称

一天偶然发现知乎上有篇关于对python编程中的if __name__ == ‘main’的理解陈述,看完之后,自己觉得不够简单明了,于是在其文章底部写了一句话,突然收获各位乎友满满的赞同相信初学者在学习Python的

プログラムの先頭 Pythonで書かれたプログラムを見るとたまに「if __name__ == ‘__main__’:」と書かれたものがあります。 他の言語を学習したことのある人は、mainと書かれているのを見てプログラムの最初に定義する関数やメソッドを想像したのではない

__name__ is simply a built-in variable in Python which evaluates to the name of the current module. To fully understand what __name__ is and how it used, let’s go through a series of examples. Example 1 Let’s create a simple Python script in a file called test.py

python 中__name__ = ‘__main__’ 的作用,到底干嘛的?有句话经典的概括了这段代码的意义: “Make a script both importable and executable” 意思就是说让你写的脚本模块既可以导入到别的模块中用,另外该模块自己也可执行。

Any program in python that is imported as a module will have __name__ variable set to the name of the module. In all other cases it will be the default value of __main__ When myfirstmodule is executed from another program as a module, then the value of When

每一个程序员都有一个梦想,梦想着能够进入阿里、腾讯、字节跳动、百度等一线互联网公司,由于身边的环境等原因,不知道 BAT 等一线互联网公司使用哪些技术?或者该如何去学习这些技术?或者我该去哪

這兩種方法就是比較常用的在一個模塊中執行另一個模塊的 if __name__ == ‘__main__’ 的方法。 總結來說就是,一個是在子進程中執行代碼,一個是在當前進程中執行代碼。 好啦,今天的內容就到這了,感興趣的你,可以試試能不能走出來~

这个功能还有一个用处:调试代码的时候,在”if __name__ == ‘__main__’“中加入一些我们的调试代码,我们可以让外部模块调用的时候不执行我们的调试代码,但是如果我们想排查问题的时候,直接执行该模块文件,调试代码能够正常运行!

What is if __name__ == “__main__”? Like other programming languages, Python too has an execution entry point i.e. main. A module is a file containing Python definitions and statements. Every module in python has a special attribute called __name

22/8/2017 · __name__はPythonプリンタでPython スクリプトを読み込むと自動的に作成される。 Pythonスクリプトを直接実行した時には、そのスクリプトファイルは「__main__」という名前のモジュールとして認識される

결론적으로 if __name__ == “__main__”와 같이 조건문을 사용하여 터미널에서와 같이 직접 호출되어 사용될 때는 그 자체로 기능을 수행하고, 동시에 다른 모듈에서 필요한 함수 등을 제공할 수 있습니다.

When a python file is executed it is assigned a name. The initial file that is executed via “python file.py” is assigned the name “main” and it is stored under the variable __name__. In other cases, say the file is imported (“import file

Notice that here we don’t see the ‘test’ line that mymath.py had near the bottom of its code. That’s because, in this context, mymath is not the main program. That’s what the if __name__ == “__main__”: trick is used for. [From a post to Python Tutor by

if __name__ == “__main__” 이 문장을 이해하기 위해서는 파이썬의 namespace 라는 개념을 이해해야 한다. namespace 를 얘기하기 이전에 파이썬에서 name(변수명)이 의미하는 것을 생각해보자. 아래와 같이 파이썬에서는 name 에 값을 줄 수 있다.

출력해보면 B에 있는 4와5의 합, 그리고 D에 있는 5와6의 합 모두 출력되는 것을 볼 수 있다. 정리 이처럼 if __name__ == “__main__”: 의 조건문 뒤의 코드는, 해당 조건문이 있는 파일에서만 실행되고, 다른 파일에 import 했을 시 실행되지 않는다.

When a python program starts to execute, it sets a few special variable, __name__ is one of them. It contains the value __main__ if it’s the main program being executed. But it won’t have the value as __main__ being set, if it’s being imported and executed, since it’s not the main program when imported.

__name__ is a built-in global variable which evaluates to the name of the current module. It is equal to __main__ if the script is run directly, otherwise the script is being imported. In this case, the variable __name__ carries the module name.

The main reason is because importing a module runs it. However, a module’s __name__ attribute is only set to “__main__” if it was executed directly, instead of imported. Thus, you can write a module to run by itself, but also import it without having it try to run as if

Like many other languages, python is also a block-structured language. Blocks Block is basically a group of statements in a code script. A block in itself can have another block or blocks, hence making it a nested block. Now, to differentiate one block of code from

28/1/2018 · 對於 __name__ == ‘__main__’ 到底是什麼意思,一直存有疑問;在我們的爬蟲課程的問題討論區中,也不時看到同樣的問題。如果你上網搜尋之後還是似懂非懂,這篇文章會嘗試用初學者的角度再說明一次。 你就可以看到 __name__ 的值在檔案被直接