pip安装jieba报错：由于目标计算器积极拒绝，无法连接

问题现象

使用pip安装jieba的时候，报错如下：

C:\Users\11767>pip install jieba

Defaulting to user installation because normal site-packages is not writeable

WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x000001602645F280>: Failed to establish a new connection: WinError 10061 由于目标计算机积极拒绝，无法连接。'))': /simple/jieba/

2.解决方法：切换为国内镜像源

切换pip镜像源，直接命令行输入：

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

如上，切换镜像源后，安装成功。