heroku hosting apython flask application error

Question

i have recently deployed my python flask app to heroku but the following error occurs:

2016-07-29T17:32:00.145010+00:00 heroku[web.1]: State changed from crashed to starting
2016-07-29T17:32:11.162187+00:00 heroku[web.1]: Starting process with command `gunicorn myapp:app --log-file=-`
2016-07-29T17:32:13.548294+00:00 heroku[web.1]: Process exited with status 3
2016-07-29T17:32:13.448537+00:00 app[web.1]: [2016-07-29 17:32:13 +0000] [3] [INFO] Starting gunicorn 19.6.0
2016-07-29T17:32:13.449154+00:00 app[web.1]: [2016-07-29 17:32:13 +0000] [3] [INFO] Listening at: http://0.0.0.0:57535 (3)
2016-07-29T17:32:13.456988+00:00 app[web.1]:   File "/app/.heroku/python/lib/python2.7/site-packages/gunicorn/app/base.py", line 67, in wsgi
2016-07-29T17:32:13.456990+00:00 app[web.1]:     return self.load_wsgiapp()
2016-07-29T17:32:13.456993+00:00 app[web.1]:   File "/app/myapp.py", line 71
2016-07-29T17:32:13.456994+00:00 app[web.1]:     data[i]={**a[i],**b,**c,**d,**e}
2016-07-29T17:32:13.563973+00:00 heroku[web.1]: State changed from starting to crashed
2016-07-29T17:32:14.847126+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/favicon.ico" host=obscure-plateau-26852.herokuapp.com request_id=820cdbd3-d478-434b-be65-06f959ca2798 fwd="79.167.50.52" dyno= connect= service= status=503 bytes=
2016-07-29T17:32:14.370705+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=obscure-plateau-26852.herokuapp.com request_id=48a7f184-053b-4ba9-9833-a5e27df61867 fwd="79.167.50.52" dyno= connect= service= status=503 bytes=

i have tried changing the default ports etc. but the same error occurs.

Any ideas?

the python script that i run is called myapp.py thus i defined it as my app — dimos
– dimos, Commented Jul 29, 2016 at 18:03

Withnail · Accepted Answer · 2016-07-29 18:24:06Z

1

Well, the answer is in the traceback. Error code H10 means the app crashed when Gunicorn tried to load it onto the dyno. There's an error at line 71 of your myapp.py file, the data[i]={**a[i],**b,**c,**d,**e} line. You may need to show the rest of your file to debug that.

answered Jul 29, 2016 at 18:24

Withnail

3,1882 gold badges32 silver badges48 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

dimos Over a year ago

i actually do not get any errors when running this code locally.. thus can it be a related issue on the cloud?

Withnail Over a year ago

Sure. But it'll be impossible to tell if you don't put a full MCVE question up.

dimos Over a year ago

the error was that the default python version was 2.7.12 and the respective command is not valid for this version. Thus i added a runtime.txt. file with the line :python-3.5.2

Collectives™ on Stack Overflow

heroku hosting apython flask application error

1 Answer 1

3 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

3 Comments

Your Answer

Sign up or log in

Post as a guest

Related