If you are a Python programmer, you know the importance of its libraries. One of the easiest ways to install those libraries is by using the PIP command. However ...

上星期使用maven的时候还是一切正常。过了个周末，今天早上再用，却总是出现错误“'cmd' is not recognized as an internal or external command,”。不论是build project，还是用“mvn -v”显示maven 的版本。都能看到这个错误提示。 但是，如果直接在run里面输入"cmd"命令，可以 ...