mac 安装 python3 pip install 安装包报错问题 解决 指定版本号即可
报错：
To fix this you could try to: 1. loosen the range of package versions you've specified 2. remove package versions to allow pip attempt to solve the dependency conflict ERROR: ResolutionImpossible: for help visit https://pip.pypa.io/en/latest/user_guide/#fixing-conflicting-dependencies
解决:
pip3 install Flask-Migrate==3.1.0