flask报错 KeyError: <flask.cli.ScriptInfo object at 0x000001638AC164E0>

(flask_venv) D:\DjangoProject\flask_test>flask db init
Traceback (most recent call last):
  File "c:\users\daiyongdong0520\appdata\local\programs\python\python37\Lib\runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "c:\users\daiyongdong0520\appdata\local\programs\python\python37\Lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "d:\virtualenv\flask_venv\Scripts\flask.exe\__main__.py", line 7, in <module>
  File "d:\virtualenv\flask_venv\lib\site-packages\flask\cli.py", line 966, in main
    cli.main(prog_name="python -m flask" if as_module else None)
  File "d:\virtualenv\flask_venv\lib\site-packages\flask\cli.py", line 586, in main
    return super(FlaskGroup, self).main(*args, **kwargs)
  File "d:\virtualenv\flask_venv\lib\site-packages\click\core.py", line 717, in main
    rv = self.invoke(ctx)
  File "d:\virtualenv\flask_venv\lib\site-packages\click\core.py", line 1137, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "d:\virtualenv\flask_venv\lib\site-packages\click\core.py", line 1137, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "d:\virtualenv\flask_venv\lib\site-packages\click\core.py", line 956, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "d:\virtualenv\flask_venv\lib\site-packages\click\core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "d:\virtualenv\flask_venv\lib\site-packages\click\decorators.py", line 17, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "d:\virtualenv\flask_venv\lib\site-packages\flask\cli.py", line 425, in decorator
    with __ctx.ensure_object(ScriptInfo).load_app().app_context():
  File "d:\virtualenv\flask_venv\lib\site-packages\flask\cli.py", line 392, in load_app
    app = locate_app(self, import_name, None, raise_if_not_found=False)
  File "d:\virtualenv\flask_venv\lib\site-packages\flask\cli.py", line 257, in locate_app
    return find_best_app(script_info, module)
  File "d:\virtualenv\flask_venv\lib\site-packages\flask\cli.py", line 83, in find_best_app
    app = call_factory(script_info, app_factory)
  File "d:\virtualenv\flask_venv\lib\site-packages\flask\cli.py", line 117, in call_factory
    return app_factory(script_info)
  File "D:\DjangoProject\flask_test\app\__init__.py", line 23, in create_app
    app.config.from_object(config[config_name])
KeyError: <flask.cli.ScriptInfo object at 0x000001638AC164E0>

报错原因：

没有指向指向启动文件 flask_test.py

添加一个环境变量，解决

set FLASK_APP=flask_test.py