运行Python文件时提示‘Python’不是内部或外部命令的问题求助

Hey there! Let's work through why your Python command isn't being recognized, even after trying some fixes. Here's a step-by-step breakdown to get it sorted:

1. Locate Python 3.10's actual installation directory #

The path you found in the Start Menu (C:\Users\faiqf\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Python 3.10) is just the shortcut location—not where the actual python.exe executable lives. Here's how to find the real path:

• Right-click the Python 3.10 icon in your Start Menu and select Open file location
• In the folder that opens, right-click the Python shortcut again and choose Properties
• Look at the Target field—this will show you the full path to python.exe (it should look something like C:\Users\faiqf\AppData\Local\Programs\Python\Python310\python.exe). Copy the folder part (without python.exe at the end) for later.

2. Update your PATH environment variable #

Right now, your PATH includes C:\Python34\Scripts (for an older Python version) but no entry for Python 3.10's main directory (where python.exe is stored). Here's how to add it:

• Right-click This PC → Properties → Advanced system settings → Environment Variables
• Under System variables, find the Path variable and click Edit
• Click New and paste the Python 3.10 folder path you copied earlier (e.g., C:\Users\faiqf\AppData\Local\Programs\Python\Python310)
• Click New again and add the Scripts folder for Python 3.10 (it's inside the main folder, e.g., C:\Users\faiqf\AppData\Local\Programs\Python\Python310\Scripts)
• Move these new entries to the top of the Path list (so Windows prioritizes Python 3.10 over the older Python 3.4)
• Click OK on all windows to save changes

3. Restart your command prompt and test #

Environment variable changes don't take effect in already open cmd windows. Close any existing cmd windows, open a new one, then run these commands to check:

python --version
py --version

The py command is the Windows Python Launcher, which should automatically detect your installed Python versions if the PATH is set correctly.

4. If all else fails: Reinstall Python with PATH enabled #

If you still can't find the correct path or the above steps don't work, try reinstalling Python 3.10:

• Grab the Python 3.10 installer again
• Run the installer and make sure to check the box that says Add Python to PATH before proceeding with the installation
• Choose the Modify option if you're reinstalling over an existing setup

内容的提问来源于stack exchange，提问作者Faiq