manage.py
#!/usr/bin/env python
import os
import sys
if __name__ == "__main__":
os.environ.setdefault(
"DJANGO_SETTINGS_MODULE", "sites.dev.heroku.settings"
if 'DYNO' in os.environ
else "sites.dev.settings"
)
from django.core.management import execute_from_command_line
execute_from_command_line(sys.argv)