解决办法
set FLASK_APP=hello.py $env:FLASK_APP = "hello.py" flask run
解释
配置flask环境变量FLASK_APP，默认的是FLASK_APP=“app.py”。如果自己当前.py文件名不是app.py。需要在terminal框内修改。如当前运行python文件为：hello,py。修改代码如上！
错误案例
PS C:UsersZhaoYanDesktopFlask-projectflask5-migrate> flask db init Usage: flask db init [OPTIONS] Try 'flask db init --help' for help. Error: Could not locate a Flask application. You did not provide the "FLASK_APP" environment variable, and a "wsgi.py" or "app.py" module was not found in the current directory. PS C:UsersZhaoYanDesktopFlask-projectflask5-migrate> set FLASK_APP=migrate_app.py PS C:UsersZhaoYanDesktopFlask-projectflask5-migrate> $env:FLASK_APP = "migrate_app.py" PS C:UsersZhaoYanDesktopFlask-projectflask5-migrate> flask run * Serving Flask app 'migrate_app.py' (lazy loading) * Environment: production WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead. * Debug mode: off * Running on http://127.0.0.1:5000 (Press CTRL+C to quit) PS C:UsersZhaoYanDesktopFlask-projectflask5-migrate> flask db init Creating directory C:UsersZhaoYanDesktopFlask-projectflask5-migratemigrations ... done Creating directory C:UsersZhaoYanDesktopFlask-projectflask5-migratemigrationsversions ... done Generating C:UsersZhaoYanDesktopFlask-projectflask5-migratemigrationsalembic.ini ... done Generating C:UsersZhaoYanDesktopFlask-projectflask5-migratemigrationsenv.py ... done Generating C:UsersZhaoYanDesktopFlask-projectflask5-migratemigrationsREADME ... done Generating C:UsersZhaoYanDesktopFlask-projectflask5-migratemigrationsscript.py.mako ... done Please edit configuration/connection/logging settings in 'C:\Users\ZhaoYan\Desktop\Flask-project\flask5-migrate\migrations\alembic.ini' before proceeding. PS C:UsersZhaoYanDesktopFlask-projectflask5-migrate>
