Pycharm下载库出错ERROR: Could not find a version that satisfies the requirement

今天在公司电脑上新装python和pycharm,在安装第三方库的时候总是提示下图错误: ERROR: Could not find a version that satisfies the requirement *** (from versions: none) 搜索了很多方法都不怎么方便或者有用,试了下在cmd中输入:pip3 install xlwt 果然安装成功,可以带版本号:pip3
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