Airflow安装异常:ERROR: flask-appbuilder 1.12.3 has requirement Flask<2,>=0.12, but you'll have flask 0.11.1 which is incompatible.

1 详细异常：

ERROR: flask-appbuilder 1.12.3 has requirement Flask<2,>=0.12, but you'll have flask 0.11.1 which is incompatible.
ERROR: flask-appbuilder 1.12.3 has requirement Flask-Login<0.5,>=0.3, but you'll have flask-login 0.2.11 which is incompatible.
ERROR: flask-appbuilder 1.12.3 has requirement Flask-WTF<1,>=0.14.2, but you'll have flask-wtf 0.14 which is incompatible.

　　

2 问题原因：

　　自己pip安装的包依赖了其他版本的其他组件（Flask等），但是已经安装了不兼容的版本

3 解决办法，卸载版本不对的其他组件，然后单独制定兼容的版本号，重新安装

　　pip uninstall Flask

　　pip install Flask===1.9 （这个范围内的<2,>=0.12）

其他的就不举例了