python - Heroku: ModuleNotFoundError :No module named 'requests'

Question

I am trying to deploy a Django program to Heroku. The application runs successfully on my local machine, which uses Anaconda and Python 3.5. I cannot get it to push to Heroku. Upon the command

>git push heroku master

remote: Compressing source files... done.
remote: Building source:
remote: 
remote: -----> Python app detected
remote:  !     Python has released a security update! Please consider upgrading to python-3.6.8
remote:        Learn More: https://devcenter.heroku.com/articles/python-runtimes
remote: -----> Installing python-3.6.2
remote: -----> Installing pip
remote: -----> Installing dependencies with Pipenv 2018.5.18…
remote:        Installing dependencies from Pipfile.lock (958efe)…
remote: -----> Installing SQLite3
remote: -----> $ python manage.py collectstatic --noinput
remote:        Traceback (most recent call last):
remote:          File "manage.py", line 15, in <module>
remote:            execute_from_command_line(sys.argv)
remote:          File "/app/.heroku/python/lib/python3.6/site-packages/django/core/management/__init__.py", line 381, in execute_from_command_line
remote:            utility.execute()
remote:          File "/app/.heroku/python/lib/python3.6/site-packages/django/core/management/__init__.py", line 357, in execute
remote:            django.setup()
remote:          File "/app/.heroku/python/lib/python3.6/site-packages/django/__init__.py", line 24, in setup
remote:            apps.populate(settings.INSTALLED_APPS)
remote:          File "/app/.heroku/python/lib/python3.6/site-packages/django/apps/registry.py", line 89, in populate
remote:            app_config = AppConfig.create(entry)
remote:          File "/app/.heroku/python/lib/python3.6/site-packages/django/apps/config.py", line 90, in create
remote:            module = import_module(entry)
remote:          File "/app/.heroku/python/lib/python3.6/importlib/__init__.py", line 126, in import_module
remote:            return _bootstrap._gcd_import(name[level:], package, level)
remote:          File "<frozen importlib._bootstrap>", line 978, in _gcd_import
remote:          File "<frozen importlib._bootstrap>", line 961, in _find_and_load
remote:          File "<frozen importlib._bootstrap>", line 948, in _find_and_load_unlocked
remote:        ModuleNotFoundError: No module named 'requests'
remote: 
remote:  !     Error while running '$ python manage.py collectstatic --noinput'.
remote:        See traceback above for details.
remote: 
remote:        You may need to update application code to resolve this error.
remote:        Or, you can disable collectstatic for this application:
remote: 
remote:           $ heroku config:set DISABLE_COLLECTSTATIC=1
remote: 
remote:        https://devcenter.heroku.com/articles/django-assets
remote:  !     Push rejected, failed to compile Python app.
remote: 
remote:  !     Push failed
remote: Verifying deploy...
remote: 
remote: !   Push rejected to [redacted].

I'm not sure why I can't get the requests module to be pip installed in Heroku. It is in my requirements.txt file:

Django==2.1.7
dj-database-url==0.5.0
dj-static==0.0.6
gunicorn==19.9.0
Unipath==1.1
python-decouple==3.1
Pillow==3.3.0
Markdown==3.0.1
bleach==3.1.0
psycopg2==2.7.7
whitenoise==4.1.2
requests==2.21.0
requests-oauthlib==1.0.0

Answer 1

The output from your Heroku build shows that you have a Pipfile and Pipfile.lock in addition to your requirements.txt.

You need to choose between using pip (using requirements.txt) or Pipenv (using Pipfile and Pipfile.lock). If all three files are present, Heroku will install with Pipenv, ignoring your requirements.txt file.

Either

• move your requirements to your Pipfile and run Pipenv locally to install them and update your Pipfile.lock, delete your requirements.txt, commit, and push (to use Pipenv), or
• delete the Pipfile and Pipfile.lock, use pip (or pip-tools or similar) locally, commit, and push (to use pip).