Summarize:

Click the Windows logo in the bottom-left corner of the screen. The Start menu will pop up. Type in cmd to do so. It's at the top of the Start menu. Doing so will open Command Prompt. Type cd and a space, then type in the "Location" address for your Python file and press Enter. For example, to open a Python file in a folder named "Files" on your Desktop, you would enter cd desktop/Files here. If you copied the path to the file, you can type in cd and a space and then press Ctrl+V to paste in the path. Type in python file.py where file is your Python file's name. For example, if your Python file is named "script", you would type in python script.py here. If your Python file has one or more spaces in its name, you'll place quotation marks around the file name and extension (e.g., python "my script.py"). Doing so runs your command and opens your Python file via your computer's installed Python program. If you encounter an error that says 'python' is not recognized as an internal or external command after pressing Enter, you'll need to add Python to the PATH list before retrying this part.
Open Start . Search for Command Prompt. Click Command Prompt. Switch to your Python file's directory. Enter the "python" command and your file's name. Press Enter.