如何安装python模块 pip install numpy -i http://pypi.douban.com/simple --trusted-host pypi.douban.com
报错信息:Retrying(Retry(total=4,connect=None,read=None,redirect=None,status=None))afterconnectionbrokenby'ConnectTimeoutError(,'Connectiontopypi.orgtimedout.(connecttimeout=15)')':/simple/numpy/原因:请求超时,数据