1.提示：raise ReadTimeoutError(self._pool, None, "Read timed out.")
pip._vendor.urllib3.exceptions.ReadTimeoutError: HTTPSConnectionPool(host='files.pythonhosted.org', port=443): Read timed out.-----下载超时
、
解决办法：
更换国内镜像:命令：pip install -i https://pypi.tuna.tsinghua.edu.cn/simple jieba
2.提示：WARNING: You are using pip version 20.1.1; however, version 20.2.2 is available.
You should consider upgrading via the 'd:\python38\python.exe -m pip install --upgrade pip' command.
版本太低，需更新
python -m pip install --upgrade pip -i https://pypi.douban.com/simple
安装wordcloud失败解决办法
提示:ERROR: Could not find a version that satisfies the requirement numpy>=1.6.1 (from wordcloud) (from versions: none)
命令::pip install wordcloud -i http://pypi.douban.com/simple/ --trusted-host pypi.douban.com
原理:更换为国内镜像，wordcloud 可更换为您安装库失败的库名称