python3 is not recognized

在命令行输入python3 app.py的时候报错

'python3' is not recognized as an internal or external command,
operable program or batch file. 

原因是没有python3.exe文件,用 py替代python3就可以了,如果电脑上安装了多个python版本,用py -2或者py -3

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