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.

[OctopusLian]

windows下执行

> set FLASK_APP=flaskr
> set FLASK_ENV=development
> flask run

出错：

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.

[OctopusLian]

如果是在 Windows 下，那么导出环境变量的语法取决于使用的是哪种命令行解释器。 在 Command Prompt 下:

C:\path\to\app>set FLASK_APP=hello.py

在 PowerShell 下:

PS C:\path\to\app> $env:FLASK_APP = "hello.py"

还可以使用 python -m flask:

$ export FLASK_APP=hello.py $ python -m flask run