mac上安装 pip install Appium-Python-Client报错：ERROR: Could not install packages due to an EnvironmentError: HTTPSConnectionPool(host='files.pythonhosted.org', port=443): Max retries exceeded with url:

ERROR: Could not install packages due to an EnvironmentError: HTTPSConnectionPool(host='files.pythonhosted.org', port=443): Max retries exceeded with url:

/packages/21/ca/3261b5da5b6851ea5297f44b2dc7f3167f00a7ce3e99907b49bf69c56360/Appium-Python-Client-1.0.2.tar.gz (Caused by NewConnectionError('<pip._vendor.urllib3.connection.VerifiedHTTPSConnection object at 0x7ff5053d09d0>: Failed to establish a new connection: [Errno 8] nodename nor servname provided, or not known',))

错误：由于环境错误，无法安装包错误：HTTPSConnectionPool（host='文件.pythonhosted.org'，端口=443）：超过url的最大重试次数：
/软件包/21/ca/3261b5da5b6851ea5297f44b2dc7f3167f00a7ce3e99907b49bf69c56360/Appium-Python-Client-1.0.2。焦油.gz（由NewConnectionError（'<pip_供应商.urllib3.connection.VerifiedHTTPSConnection连接0x7ff5053d09d0>处的对象：未能建立新连接：[Errno 8]提供了nodename或servname，或未知'，））

参考资料：https://www.runoob.com/w3cnote/python-pip-install-usage.html

如果您到 pip 默认源的网络连接较差，临时使用本镜像站来升级 pip：

pip install -i https://pypi.tuna.tsinghua.edu.cn/simple pip -U

 

注意事项

如果 Python2 和 Python3 同时有 pip，则使用方法如下：

Python2：

python2 -m pip install XXX

Python3:

python3 -m pip install XXX