我试图pyinstaller在cmd中使用，但收到错误消息：
C:\Users\username>pyinstaller
'pyinstaller' is not recognized as an internal or external command,
operable program or batch file.
C:\Users\username>
当我在python 的Scripts文件夹中使用此命令时，它可以正常工作：
C:\Users\username\AppData\Local\Programs\Python\Python36-32\Scripts>pyinstaller
usage: pyinstaller [-h] [-v] [-D] [-F] [--specpath DIR] [-n NAME]
[--add-data <SRC;DEST or SRC:DEST>]
[--add-binary <SRC;DEST or SRC:DEST>] [-p DIR]
[--hidden-import MODULENAME]
[--additional-hooks-dir HOOKSPATH]
[--runtime-hook RUNTIME_HOOKS] [--exclude-module EXCLUDES]
[--key KEY] [-d] [-s] [--noupx] [-c] [-w]
[-i <FILE.ico or FILE.exe,ID or FILE.icns>]
[--version-file FILE] [-m <FILE or XML>] [-r RESOURCE]
[--uac-admin] [--uac-uiaccess] [--win-private-assemblies]
[--win-no-prefer-redirects]
[--osx-bundle-identifier BUNDLE_IDENTIFIER] …