human
Complete the below
def login_as_learner(context, learner_name='mrpibb', learner_pass='abc123'):

    ''''Log in as a learner specified by the optional arguments, or create
    such a user and log in if it doesn\'t exist.
    :context: a behave context, used for its browser
    :learner_name: optional. username of the learner.
    :learner_pass: optional. password of the learner.'
    '''
 ... Write me a the Python code you requested?
assistant
#Here is the Python code you requested.
    if (not FacilityUser.objects.filter(username=learner_name)):
        class ContextWithMixin(FacilityMixins, ):
            def __init__(self):
                self.browser = context.browser
        context_wm = ContextWithMixin()
        context_wm.create_student(username=learner_name, password=learner_pass)
    facility = FacilityUser.objects.get(username=learner_name).facility.id
    _login_user(context, learner_name, learner_pass, facility=facility)