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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_model(model):
 """ Given a model name as ``app_label.ModelName``, returns the Django model. """

    try:
        if isinstance(model, str):
            app_label, model_name = model.split('.', 1)
            m = loading.get_model(app_label, model_name)
            if not m:  # pragma: no cover
                raise LookupError()  # Django < 1.7 just returns None
            return m
        elif issubclass(model, models.Model):
            return model
    except (LookupError, ValueError):
        pass
    raise ValueError(model)