Is there a naming convention for Django apps

some good examples

• graphene_django
• users
• orders
• oauth2_provider
• rest_framework
• polls

in simple terms, app_name should have short, all-lowercase names. Underscores can be used in the module name if it improves readability. also should have a short name and it can be a plural and singular name

They must be valid package names. That rules out 2 ("import my-django-app" would be a syntax error). PEP 8 says:

Modules should have short, all-lowercase names. Underscores can be used in the module name if it improves readability. Python packages should also have short, all-lowercase names, although the use of underscores is discouraged.

So, 1 and 3 are both valid, but 3 would be the recommended approach.