import ldap3 as ldap

SERVER_NAME = ''
DN = ''
USERNAME = ''
PASSWORD = ''

server = ldap.Server(SERVER_NAME)
connection = ldap.Connection(server, user='{}\\{}'.format(DN, USERNAME), password=PASSWORD)
connection.open()
if connection.bind():
    print('Authenticated!')
else:
    print('Not Authenticated')
    print(connection.result)