pip安装库很慢(Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)))
pip3installpandas$pip3installpandasCollectingpandasRetrying(Retry(total=4,connect=None,read=None,redirect=None,status=None))afterconnectionbrokenby'ReadTimeoutError("HTTPSConnectionPool(host='pypi.org