how do i run python script using arguments in windows command line
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Okay, let's dive deep into running Python scripts with command-line arguments in Windows. This tutorial will cover the fundamentals, various techniques, error handling, best practices, and some advanced scenarios.
*I. The Basics: What are Command-Line Arguments?*
Command-line arguments are pieces of information you pass to your Python script when you execute it from the command line (or terminal). They act like inputs that can customize the script's behavior without modifying the script's code directly.
Think of it like this: You have a program that calculates the area of a rectangle. Instead of hardcoding the width and height into the script, you can pass them as command-line arguments when you run the script. This makes your script more versatile.
*II. The `sys.argv` List*
Python provides access to command-line arguments through the `sys` module. Specifically, the `sys.argv` list stores the arguments.
`sys.argv` is a list of strings.
`sys.argv[0]` always contains the name of the script itself (e.g., "my_script.py").
`sys.argv[1]` contains the first argument passed after the script name, and so on.
*III. Simple Example: Printing Arguments*
Here's a basic script to demonstrate how `sys.argv` works:
*How to run it:*
1. *Save the code:* Save the above code as `my_script.py` in a directory of your choice (e.g., `C:\MyScripts`).
2. *Open a Command Prompt:* Press the Windows key, type "cmd", and press Enter.
3. *Navigate to the directory:* Use the `cd` command to navigate to the directory where you saved `my_script.py`. For example:
4. *Run the script with arguments:* Execute the script with some arguments:
*Expected Output:*
*Explanation:*
`python my_script.py` executes the Python interpreter and runs the `my_script.py` file.
`hello`, `world`, and `123` are passed as command-line arguments.
The script prints the script's name, the number of arguments (excluding the script name), and each ...
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