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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 _has_changed(instance):
 """ Check if some tracked fields have changed """

    for field, value in instance._original_fields.items():
        if field != 'pk' and \
           not isinstance(instance._meta.get_field(field), ManyToManyField):
            try:
                if field in getattr(instance, '_tracked_fields', []):
                    if isinstance(instance._meta.get_field(field), ForeignKey):
                        if getattr(instance, '{0}_id'.format(field)) != value:
                            return True
                    else:
                        if getattr(instance, field) != value:
                            return True
            except TypeError:
                # Can't compare old and new value, should be different.
                return True
    return False