报错见下图
解决办法：在目录flask_tutorial\flask下新建文件.flaskenv，见下图
注意：.flaskenv路径不要放错了，否则会报错
flask 报错“ You did not provide the "FLASK_APP" environment variable”
报错见下图
解决办法：在目录flask_tutorial\flask下新建文件.flaskenv，见下图
注意：.flaskenv路径不要放错了，否则会报错
flask 报错“ You did not provide the "FLASK_APP" environment variable”