在使用pip安装依赖模块时，报错如下：

解决方法：
添加 --no-cache-dir参数

pip3 --no-cache-dir install -r ***

---

安装时遇到的其他问题：

• 设置python源命令：

pip3 config set global.index-url https://pypi.tuna.tsinghua.edu.cn/simple

提示没有config参数；

• 解决办法：升级pip

pip3 install -U pip
pip install --upgrade pip

• 提示:ERROR: Cannot uninstall ‘PyYAML’. It is a distutils installed project and thus we cannot accurately determine which files belong to it which would lead to only a partial uninstall.

• 解决：添加参数–ignore-installed

[pip3 --no-cache-dir install -r requirements.txt --ignore-installed