It seems like the pip command is not recognized in your command prompt. This issue can occur if the pip executable is not in the system's PATH environment variable.
To fix this, you can try the following steps:
First, ensure that you have installed Python correctly on your system. During the installation, make sure to select the option to include pip.
If you have multiple versions of Python installed, ensure that you are using the correct version's command prompt. Sometimes, different Python versions can have separate command prompts.
If you are using a virtual environment, activate the virtual environment before running the pip command.
If none of the above steps work, you can try manually adding the path to the pip executable to the PATH environment variable. The pip executable is usually located in the Scripts folder of your Python installation directory. For example, it could be something like C:\Python\Python37\Scripts. You can add this path to the PATH environment variable by following these steps:
Open the Control Panel and go to System and Security -> System -> Advanced system settings.
Click on the "Environment Variables" button.
In the "System variables" section, find the "Path" variable and click on the "Edit" button.
Add the path to the Scripts folder at the end of the "Variable value" field, separating it with a semicolon from the previous path.
Click "OK" to save the changes.
After trying these steps, open a new command prompt window and try running the pip install pandas command again. It should now recognize the pip command and install the pandas package successfully.