Troubleshoot Python setup errors in the right order
Python problems often come from multiple installations, an incorrect PATH, Windows execution aliases, the wrong VS Code interpreter, inactive virtual environments, packages installed into another environment, missing extensions, or language-server configuration. Start with the guide closest to your exact error message before reinstalling everything.
Confirm which Python executable and environment your terminal and editor use, then install packages into that same environment. Back up project files and dependency lists before deleting virtual environments or changing system-wide PATH settings.