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Key Takeaways

Okay, so you can see that I have if name is equal to main with the double underscores. And when you do this, what's going to happen is this code will now only execute if this module is ran directly, not if it is imported. If I go and I run my calculator.py file, you can see that this works and it runs. But if I run my program.py file, it no longer runs this code. It just runs whatever is directly inside of program. Now the reason for that is because of this variable right here called name. Now name is going to be equal to dunder name if you directly execute this file. So if you run this python file itself. So if something has been imported then the name variable within that script will be equal to whatever the name of the module is. Whereas if you run it directly then it will be equal to underscore main. So that's literally it. That's why you use this if_ame convention because a lot of times you write code in a module that you only want to execute if that module is ran directly. You don't want it to execute if you're importing this code from another module. So you use this convention and obviously if there's something you always want to run then you don't put it inside of this if statement. This is a good habit to get into and definitely something you could be asked in a Python interview. So make sure you understand