When you do if __name__ == "__main__": you are checking to see if you are in main already.

It's different because the entire python script is considered to be "main" in the way that public static void main is considered to be "main" in java.

When you run a python file, it starts from the very top and works its way down looking for executable statements (it bypasses declarations such as function definitions and classes).

When you run a java class it looks for the main method and starts from there.

The reason for having this if __name__ == "__main__": is so that it only executes when you run the python file directly.

As you will learn soon, python files can also be considered as "modules" to be included from other python scripts. In such cases you would not want this 'main' logic to be implicitly executed.

Much like you almost never invoked a classes main when importing it as part of a larger app in java.

Answer from robert on Stack Overflow
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From Java to Python — Basic Syntax Reference | by David Adeyinka | Medium
November 18, 2020 - This means that tabs and spaces are recognized by the language indents are used to define blocks of code. As a result, Python has no curly braces. For naming conventions, while they both use PascalCase for class names, Java uses camelCase for variable names and Python uses snake_case.
Discussions

how to switch from java to python?
It isn't as hard as you might think. If you know java you know the core fundamentals of coding that are basically the same in every language. Once you know what you need to do, it's basically looking up syntax, libraries, etc. My advice is don't stress about it, take it slow. Python is actually pretty user friendly! More on reddit.com
🌐 r/learnpython
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10
April 8, 2024
how can I translate efficiently a Java code to python? - Stack Overflow
I would be greatfull if you could tell me how one can translate a code from Java to python. Should one do it manually ? is there any tool to convert it automatically? More on stackoverflow.com
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Should I switch to Python from Java
I am currently working on a project and I use Python with it. Out of all the Java projects I made, this one is the easiest to learn and understand. Coding the syntax is a huge breeze for me, and I dont understand why people make fun of Python. More on reddit.com
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38
April 23, 2024
Before moving from Java to Python, what does Python lack that Java has? ( Think about enterprise application)
Python has analogs for almost everything that Java has. There are some differences though. Off the top of my head: Obligatory OOP. Python classes are optional. Access modifiers. Python has no analogs for public/private/protected. All classes and methods are public. Although there are conventions governing 'private' methods, there is nothing stopping you from using them in a public context. Packages. Python does allow modules, but the Java 'package' concept is missing. Typing. Python has no compile-time type checking. You can freely mix types and change types of variables at runtime. I would strongly suggest you look up Python type hints and start using them from day one. It will greatly aid debugging. Abstract classes. Python has an ABC (abstract base class) module which does almost the same thing, but there are differences. Interfaces. No such thing in Python. Since Python allows multiple inheritance, interfaces can be simulated with abstract base classes. Generics. Since there is no compile-time type checking, the concept of generics doesn't really apply. Again, you can use type hints to document generics, but they won't be enforced. Lambdas. Python does have lambdas, but they are limited to single expressions, unlike the code blocks that Java allows. More on reddit.com
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