running Python from the command line

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  1. To run Python from the command line, you can follow these steps:

    1. Open a Command Line Interface (CLI):

      • On Windows, you can use Command Prompt or PowerShell.
      • On macOS or Linux, you can use Terminal.
    2. Check if Python is Installed: Type python --version or python3 --version in the command line. This command checks the version of Python installed on your system. If Python is installed, it will display the version number. If not, you need to install Python.

    3. Install Python (if not installed):

      • You can download Python from the official website python.org.
      • Follow the installation instructions specific to your operating system.
    4. Running a Python Script:

      • Navigate to the directory containing your Python script (.py file) using the cd command. For example: cd path/to/your/script.
      • Run the script by typing python script_name.py or python3 script_name.py (replace script_name.py with the name of your script).
    5. Using Python Interactive Shell:

      • Simply type python or python3 in the command line to enter the Python interactive shell where you can write and execute Python code directly.
    6. Exiting Python Interactive Shell:

      • Type exit() or use the keyboard shortcut Ctrl + D (on Unix-like systems) or Ctrl + Z then Enter (on Windows).
    7. Running Python Code Directly in Command Line:

      • You can execute a short Python command directly in the command line by using the -c option. For example, python -c "print('Hello, World!')".
    8. Using Python Environment Variables:

      • You can set environment variables in Python using the command line. For instance, set PYTHONPATH=/path/to/directory on Windows or export PYTHONPATH=/path/to/directory on Unix-like systems.
    9. Installing Packages:

      • Use pip, the package installer for Python, to install additional packages. For example, pip install numpy.
    10. Virtual Environments:

      • It's a good practice to use virtual environments to manage dependencies for your project. You can create a virtual environment using python -m venv myenv and activate it with source myenv/bin/activate (Unix-like systems) or myenv\Scripts\activate (Windows).

    These are the basic steps and commands for running Python from the command line. Depending on what you want to do, there might be additional commands or steps.

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