Error: Could not locate a Flask application. #1881

gchristofferson · 2018-09-27T00:48:36Z

After following these steps in the Python Flask tutorial:
https://code.visualstudio.com/docs/python/tutorial-flask#_refactor-the-project-to-support-further-development

I can only run the app in the python debug console. I can't run it in powershell, although I am following the same steps, I get this error:

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.

kraigb · 2018-09-27T16:18:42Z

Under Powershell, you have to set the FLASK_APP environment variable as follows:

$env:FLASK_APP = "webapp"

Then you should be able to run "python -m flask run" inside the hello_app folder. In other words, PowerShell manages environment variables differently, so the standard command-line "set FLASK_APP=webapp" won't work.

Let me know if that solves your problem.

gchristofferson · 2018-09-27T17:03:46Z

Yes that worked. Thank you!

…

On Thu, Sep 27, 2018, 9:18 AM Kraig Brockschmidt ***@***.***> wrote: Under Powershell, you have to set the FLASK_APP environment variable as follows: $env:FLASK_APP = "webapp" Then you should be able to run "python -m flask run" inside the hello_app folder. In other words, PowerShell manages environment variables differently, so the standard command-line "set FLASK_APP=webapp" won't work. Let me know if that solves your problem. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#1881 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AYCluBoxxhC4DAeU3y-y5S-B3hNE_J2eks5ufPpzgaJpZM4W7uOq> .

kraigb · 2018-09-27T17:28:40Z

Great! Thanks for filing the issue, too; it's not quite a detail I want to put in the docs proper, so having the issue here allows folks to find the solution if they run into the same problem.

CarlosEduardo12 · 2019-03-06T02:26:14Z

Under Powershell, you have to set the FLASK_APP environment variable as follows:

$env:FLASK_APP = "webapp"

Then you should be able to run "python -m flask run" inside the hello_app folder. In other words, PowerShell manages environment variables differently, so the standard command-line "set FLASK_APP=webapp" won't work.

Let me know if that solves your problem.

Thanks i had the same problem and that worked!!

schanore · 2019-06-20T00:43:08Z

Under Powershell, you have to set the FLASK_APP environment variable as follows:

$env:FLASK_APP = "webapp"

Then you should be able to run "python -m flask run" inside the hello_app folder. In other words, PowerShell manages environment variables differently, so the standard command-line "set FLASK_APP=webapp" won't work.

Let me know if that solves your problem.

I am facing this issue in Anaconda prompt? can you help me with the solution ?

StrawberryStatement · 2019-09-23T07:13:50Z

Under Powershell, you have to set the FLASK_APP environment variable as follows:
$env:FLASK_APP = "webapp"
Then you should be able to run "python -m flask run" inside the hello_app folder. In other words, PowerShell manages environment variables differently, so the standard command-line "set FLASK_APP=webapp" won't work.
Let me know if that solves your problem.

I am facing this issue in Anaconda prompt? can you help me with the solution ?

Have you solved it?

Shubham-nodia · 2019-12-03T11:55:47Z

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.

drinkmorewaters · 2019-12-10T06:41:36Z

For others try export FLASK_APP=hello.py the name of your entry file being whatever you called it export FLASK_APP=app.py, export FLASK_APP=this.py upto you.

DinaTaklit · 2020-01-29T22:28:14Z

For others try export FLASK_APP=hello.py the name of your entry file being whatever you called it export FLASK_APP=app.py, export FLASK_APP=this.py upto you.

Thank you this solved the issue for me :D

marcelogere · 2020-02-05T01:03:34Z

Under Powershell, you have to set the FLASK_APP environment variable as follows:

$env:FLASK_APP = "webapp"

Then you should be able to run "python -m flask run" inside the hello_app folder. In other words, PowerShell manages environment variables differently, so the standard command-line "set FLASK_APP=webapp" won't work.

Let me know if that solves your problem.

This work for me, thanks!!!

kraigb · 2020-02-10T17:08:50Z

@JoshuaPartlow just a reminder note to check the VS Code docs and make sure the PowerShell variant reported here is included.

truewithdream · 2020-03-25T23:52:26Z

Set-Location C:\Users\truew\PycharmProjects\milan\webserver

(webserver) PS C:\Users\truew\PycharmProjects\milan\webserver> flask run

Serving Flask app "webapp"
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
Usage: flask run [OPTIONS]

Error: Could not import "webapp".

Muhammadb1094 · 2020-04-16T09:15:54Z

I'm a new in python flask and using pycharm how to run 1st output on the web browser..where to run and how to run the commands.
its showing me this if i write "flask run" in terminal ! ?

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 curren
t directory.

kraigb · 2020-04-16T14:35:55Z

@Muhammadb1094 You need to create an environment variable named FLASK_APP. See the "Tip" under step 8 in https://code.visualstudio.com/docs/python/tutorial-flask#_create-and-run-a-minimal-flask-app.

ankushbosi13 · 2020-04-21T11:51:34Z

thank you it worked for me ;)

Muhammadb1094 · 2020-04-21T14:14:39Z

Thanks..karaigb

Mohamedkable · 2020-04-21T17:32:44Z

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.
.....I can not solve this error @kraigb

JoshuaPartlow · 2020-04-21T17:49:56Z

Hi @Mohamedkable - What filename are you using for your Flask app? By default, a Flask looks for app.py, if you use something different then you need to set a FLASK_APP environment variable with the alternate filename. So if you used hello.py as your file, on Windows, and were running in the terminal you'd need to use "set FLASK_APP=hello.py". Where are you trying to run the Flask app from? There's some alternate guidance above from @kraigb if you're using PowerShell. The Flask cli docs also have some guidance. Does that help?

Mohamedkable · 2020-04-21T17:58:41Z

@JoshuaPartlow I do that already, but i do now work also..i run the code from Git Bash on windows

JoshuaPartlow · 2020-04-21T18:15:13Z

I've not tried running from Git Bash before, but you should be able to do "echo $FLASK_APP" to verify if the variable has been set correctly.

Mohamedkable · 2020-04-21T18:16:53Z

Thanks,sir
I write this code in my app that is run well but if i change the port to 5000.it do not work...
i do not know why..? @JoshuaPartlow
if name == 'main':
app.run(port=4000,debug=True)

JoshuaPartlow · 2020-04-21T18:30:29Z

Hi @Mohamedkable - The help I can offer is around the VS Code docs for our Flask tutorial. For general Flask issues I'd suggest looking at the documentation for Flask.

Mohamedkable · 2020-04-21T18:31:14Z

okay sir thank you

Suban5 · 2020-04-24T06:30:30Z

adding "python_dotenv" solved my issue in pycharm

JoyVehmeijer · 2020-05-12T13:06:26Z

For others try export FLASK_APP=hello.py the name of your entry file being whatever you called it export FLASK_APP=app.py, export FLASK_APP=this.py upto you.

This worked for me!

JoshuaPartlow · 2020-06-11T20:43:50Z

@Dharanya-Subramanian - So, to clarify, the app is running in the VS Code console, but you can't get it to run from a standard windows cmd window?

Dharanya-Subramanian · 2020-06-13T07:28:12Z

@Dharanya-Subramanian - So, to clarify, the app is running in the VS Code console, but you can't get it to run from a standard windows cmd window?

Yes Sir

JoshuaPartlow · 2020-06-13T20:38:58Z

@Dharanya-Subramanian - If that's the case, you likely just need to create an environment variable in your cmd window prior to running. By default, Flask looks for app.py, if you use something different (like hello.py) for your filename then you need to set a FLASK_APP environment variable with the alternate filename. So if you used hello.py as your file, on Windows, and were running in the cmd window you'd need to use set FLASK_APP=hello.py. The Flask cli docs also have some guidance.

Dharanya-Subramanian · 2020-06-14T07:09:17Z

Thank you so much sir. It works for me.

…

On Sun, Jun 14, 2020 at 2:09 AM Joshua Partlow ***@***.***> wrote: @Dharanya-Subramanian <https://github.com/Dharanya-Subramanian> - If that's the case, you likely just need to create an environment variable in your cmd window prior to running. By default, Flask looks for app.py, if you use something different (like hello.py) for your filename then you need to set a FLASK_APP environment variable with the alternate filename. So if you used hello.py as your file, on Windows, and were running in the cmd window you'd need to use set FLASK_APP=hello.py. The Flask cli docs <https://flask.palletsprojects.com/en/1.0.x/cli/> also have some guidance. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#1881 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AOSJPN72HLIMJ6DV6T3BRQ3RWPPW7ANCNFSM4FXO4OVA> .

raeesanjum010 · 2020-06-24T12:11:10Z

@JoshuaPartlow i was set the environment. set the FLASK_APP and FLASK_ENV both. but still get this 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." let me now how to solve this

kolliparachandra · 2020-06-28T22:38:27Z

$env:FLASK_APP = "file.py" works like charm in VS code, thanks for the help

JoshuaPartlow · 2020-06-29T00:41:52Z

Hi @raeesanjum010 - Are you working through the VS Code Flask tutorial? If you are, generally the solution to that error is to make sure you've explicitly set the FLASK_APP environment variable to the correct file name if you haven't used the default app.py name. If you're not working on the tutorial, you might want to take a look at the Flask CLI documentation and Flask docs.

marquitobb · 2020-11-01T03:20:50Z

export FLASK_APP=main.py

Thakur-ajay12 · 2021-01-14T08:31:59Z

Under Powershell, you have to set the FLASK_APP environment variable as follows:
$env:FLASK_APP = "webapp"
Then you should be able to run "python -m flask run" inside the hello_app folder. In other words, PowerShell manages environment variables differently, so the standard command-line "set FLASK_APP=webapp" won't work.
Let me know if that solves your problem.

I am facing this issue in Anaconda prompt? can you help me with the solution ?

after getting into directory run dir and then use traditional command set FLASK_APP = hello.py

akshay386 · 2021-01-15T18:01:07Z

For others try export FLASK_APP=hello.py the name of your entry file being whatever you called it export FLASK_APP=app.py, export FLASK_APP=this.py upto you.

this one is work for me

AntenehBiz · 2022-05-17T19:50:20Z

if you are using window
set FLASK-APP=hello
flask run
it works for me

DofusCL · 2022-07-25T10:10:19Z

I had to move the file from the subfolder that i put it to the location from the VENV folder, or the Flask could't catch the file.
How do i set the rute for the envierment to the FLASK_APP ?

Tnks.

AntenehBiz · 2022-10-11T07:47:56Z

Hello Can I saw your code, or terminal, I will help you with zoom, slack or telegram

…

On Mon, 25 Jul 2022, 13:10 Nicolás Bosoni Spinetto, < ***@***.***> wrote: I had to move the file from the subfolder that i put it to the location from the VENV folder, or the Flask could't catch the file. How do i set the rute for the envierment to the FLASK_APP ? Tnks. — Reply to this email directly, view it on GitHub <#1881 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AVBUB3I4HDGQCAEV4B3F5GTVVZRZPANCNFSM4FXO4OVA> . You are receiving this because you commented.Message ID: ***@***.***>

mohamedx29 · 2023-03-02T21:29:46Z

Actually, the problem is solved once we use $env:FLASK_APP="run" for example, then for th first time we should call python -m flask shell or run or whatever. The second time you connect to the FLASK_APP, we can use the first like : set FLASK_APP="run" and flask shell/run ... I did work for me in both the windows cmd CLI and PowerShell.
I hope that will help.

Thanks.

saintmathew · 2023-03-09T13:05:35Z

$env:FLASK_APP = "webapp"

Wow, this worked for me. I've been stuck for a few days. Thanks so much

gchristofferson changed the title ~~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.~~ Error: Could not locate a Flask application. Sep 27, 2018

gregvanl assigned kraigb Sep 27, 2018

gregvanl added the python label Sep 27, 2018

kraigb closed this as completed Sep 27, 2018

luabud mentioned this issue Mar 15, 2023

Update Python language section + Flask tutorial #6144

Merged

Error: Could not locate a Flask application. #1881

Error: Could not locate a Flask application. #1881

Comments

gchristofferson commented Sep 27, 2018

kraigb commented Sep 27, 2018

Uh oh!

gchristofferson commented Sep 27, 2018 via email

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kraigb commented Sep 27, 2018

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CarlosEduardo12 commented Mar 6, 2019

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schanore commented Jun 20, 2019

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