将 Django 部署到 Heroku 时：ModuleNotFoundError: No module named 'env'

Question

When deploying Django to Heroku, I get a ModuleNotFoundError: No module named 'env' error.

Anyone know why it is looking for that module?

Here is my requirements.txt:

asgiref==3.2.3
certifi==2020.12.5
chardet==3.0.4
dj-database-url==0.5.0
Django==1.11
django-forms-bootstrap==3.1.0
gunicorn==20.0.4
idna==2.10
Pillow==5.3.0
psycopg2==2.8.6
pytz==2020.4
requests==2.25.0
sqlparse==0.4.1
stripe==2.55.1
urllib3==1.26.2
whitenoise==5.2.0

Here is the build log from Heroku:

File "/app/.heroku/python/lib/python3.6/site-packages/django/core/management/__init__.py", line 363, in execute_from_command_line
           utility.execute()
         File "/app/.heroku/python/lib/python3.6/site-packages/django/core/management/__init__.py", line 307, in execute
           settings.INSTALLED_APPS
         File "/app/.heroku/python/lib/python3.6/site-packages/django/conf/__init__.py", line 56, in __getattr__
           self._setup(name)
         File "/app/.heroku/python/lib/python3.6/site-packages/django/conf/__init__.py", line 41, in _setup
           self._wrapped = Settings(settings_module)
         File "/app/.heroku/python/lib/python3.6/site-packages/django/conf/__init__.py", line 110, in __init__
           mod = importlib.import_module(self.SETTINGS_MODULE)
         File "/app/.heroku/python/lib/python3.6/importlib/__init__.py", line 126, in import_module
           return _bootstrap._gcd_import(name[level:], package, level)
         File "<frozen importlib._bootstrap>", line 994, in _gcd_import
         File "<frozen importlib._bootstrap>", line 971, in _find_and_load
         File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
         File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
         File "<frozen importlib._bootstrap_external>", line 678, in exec_module
         File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
         File "/tmp/build_ae2377c8_/issuetracker/settings.py", line 15, in <module>
           import env
       ModuleNotFoundError: No module named 'env'
 !     Error while running '$ python manage.py collectstatic --noinput'.
       See traceback above for details.
       You may need to update application code to resolve this error.
       Or, you can disable collectstatic for this application:
          $ heroku config:set DISABLE_COLLECTSTATIC=1
       https://devcenter.heroku.com/articles/django-assets
 !     Push rejected, failed to compile Python app.
 !     Push failed

Answer 1

either remove the import env code from the settings.py file and run this code

heroku config:set DISABLE_COLLECTSTATIC=1

Answer 2

I remember how to get around this problem now. I needed to add to my settings file:

    if os.path.exists('env.py'):
        import env

Heroku is working again.

Thanks for your answers.