DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.oracle',
        'NAME': 'Hostname:Port/Service name not SID',
        'USER': 'Username',
        'PASSWORD': 'Password',
    }
}

dsn_tns = cx_Oracle.makedsn('Hostname', 'Port',
                             service_name='Service name not SID')
connection = cx_Oracle.connect('Username', 'Password', dsn_tns)

DATABASES = {
'default': {
    'ENGINE': os.environ['DB_ENGINE'],
    'NAME': os.environ['DB_NAME'],
    'HOST': os.environ.get('DB_HOST', 'localhost'),
    'PORT': os.environ.get('DB_PORT', '1521'),
    'USER': os.environ.get('DB_USER', 'user'),
    'PASSWORD': os.environ.get('DB_PASS', "pass")
}

DB_NAME=XE
DB_USER=user
DB_PASS=pass
DB_HOST=10.7.0.140 <-- ip host
DB_PORT=1521
DB_ENGINE=django.db.backends.oracle