部署 Flask 应用程序时出现 dateutil 语法错误

Question

I am trying to deploy a flask application ( https://github.com/ihavemadefire/BestYearYet ) using Heroku. When I deploy it it crashes immediately. I can't tell if the redirect is telling me there is an error in my code (It runs perfectly on a local browser port), an error in my virtual env or if there is an error in an external library.

I have tried updating the appdirs and flask-dateutil libraries. I have tried deploying from the Heroku git cli and from Github. I checked my code to see if I missed something (but like I said, it runs fine locally) I even tried rebooting. I think this problem is beyond my experience level.

Here are the relevant error logs from Heroku (greatly truncated):

File "/app/.heroku/python/lib/python3.6/site-packages/alembic/script/base.py", line 7, in from dateutil import tz File "/app/.heroku/python/lib/python3.6/site-packages/dateutil/tz.py", line 78 self._name , ^

Answer 1

Uninstall python-dateutil:

pip uninstall python-dateutil

And install the new version:

i use this version

pip install python-dateutil==2.81

see if you have the requirements.txt file, remember to change the version of python-dateutil there too, manually or try this:

pip freeze > requirements.txt

if you don't have a requirements.txt, consider making one because it is "good practice" and is really helpfull

Answer 2

It looks like alembic depends on python-dateutil. In your Requirements.txt make sure alembic comes after the dateutil entry and try pushing the app to heroku again.