Problem with Heroku on windows/ requirement pywin32==227

Deployment
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1

Hello Streamlit community,

I tried to deploy an app (slidebar example in the Stralit documentaion) on Heroku/Windows, and was unable to do it. Below are the details of how I did, and the message error I got:

1- I followed the indications given here : https://devcenter.heroku.com/articles/getting-started-with-python#define-a-procfile
2- I modified a little bit the Pocfile.windows; my Pocfile.windows contains this line:
web: python manage.py && streamlit run slidebar.py
3- in the Streamlt environment created with Anaconda, pip freeze > requirements.txt
4- then, in my repository :

Everything seems OK after the following steps:

  • push the commited repository onto GitHub
  • create Heroku myapp
    But the the last step
  • push heroku master
    after giving a lot of OK lines, gives this:

ERROR: Could not find a version that satisfies the requirement pywin32==227

So the push is rejected.

My versions:

  • windows 10
  • conda 4.5.8
  • python 3.6
  • streamlit : the latest version (I upgraded today)

Would anyone help, please ?

Thanks in advance

2

Hey @AZlearn,

Since you pinned the versions on Windows, it also pinned pywin32 which is a Windows-specific package and won’t be available on an Unix VM on Heroku, hence the Could not find a version that satisfies the requirement pywin32==227.

You can comment/remove it in the requirements.txt you generated and push back into master :slight_smile:

3

Hi Fanilo,
Thanks for your quick answer.

1- First try
When removing the line pywin32==227 from requirements.txt.
the push doesn’t give any error.
But when opening the app, it can’t open and gives an error: “An error occurred in the application and your page could not be served.”

The command heroku logs --tail gives this:

Build failed – check your build output: https://dashboard.heroku.com/apps/45e86b9a-b579-4cb5-9a06-03992e00c026/activity/builds/a22c280a-5469-40d4-8b86-5b457e201b68

The line pywin32 was at line 58 in the original requirements.txt file
There was also pywinpty==0.5.7

2- Seecond try
I equally removed line pywinpty==0.5.7
Nevertheless, I obtained the same behavior: everything seems to work fine, but the app doesn’t show up and gives an error message:

Successfully installed Jinja2-2.11.2 MarkupSafe-1.1.1 Pillow-7.1.1 Pygments-2.6.1 Send2Trash-1.5.0 altair-4.1.0 astor-0.8.1 attrs-19.3.0 backcall-0.1.0 base58-2.0.0 bleach-3.1.4 blinker-1.4 boto3-1.12.42 botocore-1.15.42 cachetools-4.1.0 certifi-2020.4.5.1 chardet-3.0.4 click-7.1.1 colorama-0.4.3 cycler-0.10.0 decorator-4.4.2 defusedxml-0.6.0 docutils-0.15.2 entrypoints-0.3 enum-compat-0.0.3 future-0.18.2 idna-2.9 importlib-metadata-1.6.0 ipykernel-5.2.1 ipython-7.13.0 ipython-genutils-0.2.0 ipywidgets-7.5.1 jedi-0.17.0 jmespath-0.9.5 jsonschema-3.2.0 jupyter-client-6.1.3 jupyter-core-4.6.3 kiwisolver-1.2.0 matplotlib-3.2.1 mistune-0.8.4 nbconvert-5.6.1 nbformat-5.0.6 notebook-6.0.3 numpy-1.18.3 packaging-20.3 pandas-1.0.3 pandocfilters-1.4.2 parso-0.7.0 pathtools-0.1.2 pexpect-4.8.0 pickleshare-0.7.5 prometheus-client-0.7.1 prompt-toolkit-3.0.5 protobuf-3.11.3 ptyprocess-0.6.0 pydeck-0.3.1 pyparsing-2.4.7 pyrsistent-0.16.0 python-dateutil-2.8.1 pytz-2019.3 pyzmq-19.0.0 requests-2.23.0 s3transfer-0.3.3 six-1.14.0 streamlit-0.58.0 terminado-0.8.3 testpath-0.4.4 toml-0.10.0 toolz-0.10.0 tornado-5.1.1 traitlets-4.3.3 tzlocal-2.0.0 urllib3-1.25.9 validators-0.14.3 watchdog-0.10.2 wcwidth-0.1.9 webencodings-0.5.1 widgetsnbextension-3.5.1 wincertstore-0.2 zipp-3.1.0
remote: -----> Discovering process types
remote: Procfile declares types -> (none)
remote:
remote: -----> Compressing…
remote: Done: 139.6M
remote: -----> Launching…
remote: Released v6
remote: https://slidebar-vbtapp-m.herokuapp.com/ deployed to Heroku
remote:
remote: Verifying deploy… done.
To https://git.heroku.com/slidebar-vbtapp-m.git
a827d30…cb5792d master -> master
==> seems to be OK

==> But the app gives an error.
But in this 2nd try, heroku logs --tail gives error code=H14 (different from previously):

Build succeeded
2020-05-03T15:22:05.058313+00:00 heroku[router]: at=error code=H14 desc=“No web processes running” method=GET path="/" host=slidebar-vbtapp-m.herokuapp.com request_id=4823cdbe-5097-4028-abbc-8228d7aa3570 fwd=“89.159.19.111” dyno= connect= service= status=503 bytes= protocol=https

My requirements.txt file is here : https://github.com/AZLearn/stlit-slider-heroku-test-m
Would you please have a look at it and tell me how to fix it ?

Thanks in advance

4

HI, I am also facing the same issue. Could you pleasse tell me do you find any method to solve the issue?

5

I’m not sure why you have Django there.

This might be down to having to specify the port to run on. There’s a working example here, check the procfile:

6

Hi Ian_Calvert, @ Vidush5
My problem was reformulated here: Problem with deployement on Heroku with WINDOWS

I have no more issues with pywin32 in the requirements.txt file (simply removed it).

Please re-read the post cited above, where my problem (still unsolved) is fully described. It is essentially a WINDOWS DEPLOYMENT issue, and specifically concerning the Pocfile.windows file, I guess.

Tons of indications have been given on this forum for Heroku/Linux, but I haven’t seen anything for Windows.

Thank you for your reply.

Any help for Heroku/Windows from anyone on the forum is appreciated.

Thanks