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As you already know, whenever you want to code a new Python app, what you do is you start pancham.

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Then you go to file new project, pick a folder.

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For example, I have prepared this with python empty folder.

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I'll just pick that.

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Sometimes you may write that folder here and python will create an empty folder for you.

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Either way is fine.

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And then when you press on create, what happens is that Python will produce a virtual environment for

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us automatically.

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Then we can create Python files from here, and then we can run those Python files using port charm.

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So everything happens like magic, which is fine.

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The problem with that is that it's a bit of a black box for beginners.

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So in this video, what I want to show you is how to create Python apps without using an ID, so that

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will help you understand how things works behind the scenes and that will make you a better programmer.

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So let's start.

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This is with pie charm.

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This folder that's just got populated with these two folders, the van folder which contains the virtual

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environment.

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I've already explained what virtual environments are, but I'll talk about that again in this video.

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And then in this folder we also have this dot idea folder which contains configuration files about this

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part term project.

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So these are related to the actual project ID.

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Now I also have this without pie folder in here, which is empty.

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Now I want to start a new app in this folder.

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So how do you do that?

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Well, starting a new app implies that you need three things, so you need to create that P files.

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You need a text editor to edit those plus P files.

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And third, you need a python interpreter to run those dot PY files.

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When we use an ID, all of that is taken care of by the ID.

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But now let's see how we can get everything together to be able to code a program.

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So the first thing you do out of these three is you take care of the python interpreter.

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So it's a good idea to create a virtual environment and use the interpreter of that virtual environment

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instead of using the interpreter you have installed globally in all your operating system.

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So let's create a virtual environment first.

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For that, you need to right click over that folder and go to open in terminal on Mac that could be

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hidden somewhere under more services.

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And then there will you'll see open new terminal or something like that.

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So if you do that.

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Now the terminal app here is pointing to this directory, so that's the current directory.

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And here I can create a virtual environment using the command p y -3.11.

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If you are on Mac or Linux, that should be Python 3.11 without spaces, but you might also want to

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change the version to something else.

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Whatever you have.

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13.

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14.

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So I am on a Windows currently.

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So that would be P space minus three points 11.

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So please make sure to have the actual version here.

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3.11 In my case then you have an MX flag.

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The RM flag allows you to access Python libraries then is one of the Python libraries standard Python

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libraries.

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So just like we have other Python libraries which we import inside a Python script, this is also a

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library, but in this case we are using it in another way.

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So this library now will create a folder named End or Python likes to call it.

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So as you see here, Python created this event folder.

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Which you can also see inside this folder.

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So that's the same directory and that same folder is what we will create now.

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But in this other folder.

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So if you press enter now, what will happen is that inside this folder, a vent folder will be generated.

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So let's check that.

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Yeah, here we go.

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And if you go to the scripts folder on Mac and Linux, that should be named Bin.

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So go to the bin folder on Mac or Linux scripts on Windows.

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And here you should see Python.

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So that's the interpreter we should use for running the files of this project.

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So to create files then.

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There are two ways.

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You either create the files from the command line from here, if you prefer using commands, or you

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can create the files using the file system.

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For example, you can right click here, go to new and go to text documents and write something like

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main that p y.

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On Mac, you probably need to use the terminal using the command touch main dot P because on Mac is

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not easy to create new text files.

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Now note that even though we named this file that P on Windows, this still has a dot txt extension.

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So technically this is main that p dot txt but windows is hiding that txt extension.

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To fix that you want to go here.

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And then go to options.

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So go to file and folder options and then you want to go to view and then you want to uncheck this option.

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Hide extensions for known file types apply.

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Okay.

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And now Windows is revealing the truth here.

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So it's telling us that this does actually have a TXT extension.

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So rename the file to main that spy the next you want to start coding.

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So we you might use any editor that you like.

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So you could use Notepad on Windows text.

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Edit on Mac.

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I'm just picking in a simple editor here.

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Then here you can start coding like that.

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Of course, as you can see, this doesn't have syntax highlighting, so you're coding in the dark,

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so to say.

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And this is how things were in the past when modern ideas didn't exist.

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So I can save this file.

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I want to run it.

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Go to the terminal again.

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If you close it, you should go back in here and open it again.

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And then to run the file.

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Now you have two options.

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You can either run it with your main python interpreter, your global interpreter, or using your virtual

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environment python.

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So of course, the second option makes more sense.

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You should use the python of your virtual environment.

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That's better because it keeps this interpreter only for this project.

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So if you install, for example, libraries, third party libraries for this particular python interpreter,

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then these libraries will be only for this interpreter.

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They will not be installed for your global python interpreter.

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So to run the main that speaker file using the virtual python you do then slash on Mac or Linux.

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On windows that would be a backslash.

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And then on Windows you'd write scripts on Mac that would be been on Linux, it would also be Bin and

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then slash again and then you access Python.

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So we are accessing.

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From vendors and scripts.

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This python file.

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And then you point to your main dot p one file.

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So make sure, of course you are inside without power charm.

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Otherwise this will not work.

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So we are running that file using that python interpreter.

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So execute that and we get.

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Hello.

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That's the output.

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And that's how you code an app without using an I.D..

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That's the manual thing of doing coding.

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So when you execute an app in point charm using that triangle button, what we do is we call that particular

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command.

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So we start the interpreter, the virtual environment interpreter, and we interpret that file using

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that interpreter, and we get the output in here.

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Now, sometimes what happens is that when you open an existing project in term.

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Any project.

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Sometimes Pine Shire may not recognize the virtual environment immediately and you'll get probably a

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message here which tells you that you should specify an interpreter, so you might click that interpreter.

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Path the path that Pachachi is suggesting you or you have to go to the settings in here and then go

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to projects and then go to Python.

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Interpreter And then you might have to add a new interpreter by using this button here.

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Add.

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And sometimes pie charts may tell you that, Oh, this directory is not empty.

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So in that case, you should go to this folder in your file system and delete the existing vent folder,

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which is problematic, and it's causing you these messages.

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And then this message will not show here anymore.

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So you can press okay to create a new virtual environment if the previous one is having issues.

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So that was just the tip about punch.

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And thanks for following this.

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I'll see you later.