python中pip更新失败:Requirement already up-to-date: ... (19.0.3)
坑述装一个包说我的pip版本太低pip9.0.1需要升级到19.0.3运行:pipinstall--upgradepipYouareusingpipversion9.0.1,howeverversion19.0.3isavailable.Youshouldconsiderupgradingviathe'python-mpipinstall--upgradepip'command.然后我就按他的要求