How to associate py extension with python launcher on Mac OS X

Associating the .py extension with the Python launcher on macOS allows you to execute Python scripts directly by double-clicking them, just like you would with other script files. Here's a step-by-step tutorial on how to do this, along with some code examples:
Step 1: Open Terminal
You will need to use the Terminal to set up the file association. You can find Terminal in the "Utilities" folder within the "Applications" folder.
Step 2: Create a Python script
First, let's create a simple Python script for testing purposes. Open a text editor and create a new file, and then save it with the .py extension. For example, let's call it hello.py. Add the following Python code to the file:
Step 3: Set the Python Launcher as the default app
To associate the .py extension with the Python launcher, you'll use the open command with the -a flag in Terminal. Open Terminal and run the following command:
Replace your_script.py with the actual path to your Python script (e.g., /Users/yourusername/Documents/hello.py). The -a flag specifies the application to open the file with, and /usr/bin/python3 is the path to the Python launcher.
Step 4: Verify the association
Now that you've associated the .py extension with the Python launcher, you should be able to run Python scripts by double-clicking them. Locate your hello.py file in Finder, double-click it, and it should execute your Python script, displaying "Hello, Python!" in the Terminal window.
Step 5: Make it executable from any directory
If you want to make your Python scripts executable from any directory without specifying the full path, you can create a symbolic link in a directory that's in your system's PATH. For example, you can create a symbolic link to the Python launcher in /usr/local/bin. Run this command in Terminal:
Now, you can run your Python scripts from any directory by simply typing python your_script.py.
Step 6: Test the association with a different script
To make sure the .py extension is correctly associated with the Python launcher, create another Python script in a different directory and try double-clicking it. It should execute with the Python launcher.
Congratulations! You've successfully associated the .py extension with the Python launcher on macOS, making it more convenient to run Python scripts directly from the Finder.
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