old_contents: #!/usr/bin/env python
  import os
  import sys
  
  if __name__ == "__main__":
  
      try:
          from django.core.management import execute_from_command_line
      except ImportError:
          # The above import may fail for some other reason. Ensure that the
          # issue is really that Django is missing to avoid masking other
          # exceptions on Python 2.
          try:
              import django
          except ImportError:
              raise ImportError(
                  "Couldn't import Django. Are you sure it's installed and "
                  "available on your PYTHONPATH environment variable? Did you "
                  "forget to activate a virtual environment?"
              )
          raise
      execute_from_command_line(sys.argv)
  
new_contents: #!/usr/bin/env python
  import os
  import sys
  
  if __name__ == "__main__":
      # default setting from local
      os.environ.setdefault(
          "DJANGO_SETTINGS_MODULE", "gi2_liau7_khoo3.settings.local")
  
      try:
          from django.core.management import execute_from_command_line
      except ImportError:
          # The above import may fail for some other reason. Ensure that the
          # issue is really that Django is missing to avoid masking other
          # exceptions on Python 2.
          try:
              import django
          except ImportError:
              raise ImportError(
                  "Couldn't import Django. Are you sure it's installed and "
                  "available on your PYTHONPATH environment variable? Did you "
                  "forget to activate a virtual environment?"
              )
          raise
      execute_from_command_line(sys.argv)
  
subject: Set DJANGO_SETTINGS_MODULE in manage.py