How to make a command that runs Python a script in Windows command line?

Question

Background:

I'm using Windows. I know some of programming with python. I don't know much about batch, which I think I might need to do what I want.

I will show a example so it becomes more clear what I'm trying to do.

Example:

When using git, after you install it, you can call the git command from anywhere of your computer, you can execute git commands, like git init and this will create a git file in your current folder.

I don't know exactly how git works or what language they use but I want to do the same thing, create my own command that I can execute from anywhere in my computer after I "install" my program.

What I'm trying to do:

I want to make my own command and when I call it, it executes a python script.
e.g.
I install my program and it creates a command called myprogram and when I type myprogram in the command line, it's like if I typed python myprogram.py. And myprogram -someargument would be the same as python myprogram.py -someargument.

What I tried until now:

I'm searched for How to make a environment variable that runs Python script? but I never get exactly what I want, is always something like How do I set environment variable using Python script?.

Maybe I'm making the wrong question and the result I want are not showing?

I'm looking for a explanation on how to do this or at least a tutorial/guide.

Edit 1:

As UnholySheep said in the comments, it's not environment variable, its commands, so I changed the question even does what I want to know is the same thing.

Answer 1

Files you need:

First you need a python script (obviously) so I created a file called myprogram.py that have this simple line:

print("This should be from a command")

After you need to make a batch file, in my case I used a .cmd file called myprogram.cmd that have:

@ECHO OFF
python_directory\python.exe python_script_directory\myprogram.py %*

Configurations to make:

You need to set in PATH environment variable the location of the batch file batch_file_directory\myprogram.cmd

And now if you execute in the command line myprogram it will print This should be from a command.

You can also use .exe or .bat files.