Notepad4 (Notepad2⨯2, Notepad2++) is a light-weight Scintilla based text editor for Windows with syntax highlighting, code folding, auto-completion and API list for many programming languages and documents, bundled with file browser plugin matepath.
I suggested you add Notepad4 to explorer's right click menu (via Settings -> Advanced Settings -> System Intergration), instead of change association from py.exe to Notepad4.
把py文件默认打开改为Notepad4,然后快捷键运行能不能是python运行