今天用pip安装第三方库时总报超时，可能是网络不稳定地原因。 
解决方法：将超时时间延长，重新下载。
命令：1.pip --default-timeout=100 install -U pip
2.pip --default-timeout=100 install -U +第三方库名
如：pip --default-timeout=100 install -U echarts-china-cities-pypkg
HTTPSConnectionPool(host='files.pythonhosted.org', port=443): Read timed out.
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