The Problem: When running a Python script on a Windows environment, you encounter the following error message:

line 8, in 
    import pandas as pd
ModuleNotFoundError: No module named 'pandas'

This error indicates that the Python interpreter is unable to find the pandas module, which is necessary for the script to run.

Problem Analysis: The error message ModuleNotFoundError: No module named 'pandas' is typically encountered when the pandas library is not installed in the Python environment being used to execute the script. This issue often arises in the following scenarios:

• The pandas library has not been installed.
• The script is being run in a different Python environment where pandas is not installed.
• There is a misconfiguration in the Python environment or PATH settings.

Root Cause: The root cause of this issue is the absence of the pandas library in the Python environment. This can occur due to:

• Not installing the pandas library.
• Switching between different Python environments (e.g., virtual environments) where pandas is not consistently installed.
• Incorrect PATH configuration leading to the use of a different Python interpreter.

Solution: To resolve this issue, follow these steps to ensure that the pandas library is installed and correctly configured in your Python environment:

1. Verify Python Installation: Ensure that Python is installed on your system. Open Command Prompt and run:

   python --version

   This command should return the installed Python version.

2. Check Python Environment: If you are using a virtual environment, activate it. For example, if you are using venv:

   path\to\your\venv\Scripts\activate

3. Install Pandas: Use pip to install the pandas library. Run the following command in Command Prompt:

   pip install pandas

   This command will download and install the pandas library and its dependencies.

4. Verify Installation: After installation, verify that pandas is installed correctly by running:

   pip show pandas

   This command should display information about the pandas installation, including the version number and location.

5. Update PATH (if necessary): Ensure that the PATH environment variable includes the directory of the Python interpreter and the Scripts directory where pip is located. You can add these directories to PATH by following these steps:

   • Right-click on This PC or Computer on the desktop or in File Explorer.
   • Select Properties.
   • Click on Advanced system settings.
   • Click on Environment Variables.
   • In the System variables section, find the Path variable and click Edit.
   • Add the paths to the Python interpreter and the Scripts directory (e.g., C:\Python39 and C:\Python39\Scripts).

6. Run the Script Again: After completing the above steps, run your Python script again to check if the issue is resolved:

   python your_script.py

By following these steps, you should be able to resolve the ModuleNotFoundError: No module named 'pandas' error and successfully run your Python script.