No module named 'mysite' code example

Example: No module named 'mysite'

import os
    import sys
    BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
    sys.path.append(BASE_DIR)
    os.environ['DJANGO_SETTINGS_MODULE'] = 'YOURAPP.settings'
    os.environ.setdefault("DJANGO_SETTINGS_MODULE", "YOURAPP.settings")