How to use 'python if object exists' in Python

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90def object_exists(model_object):
91 """
92 Check if a model_object already exists.
93 :param model_object: an instance of a model
94 :return: true if the object already exists
95 """
96 from base.models import student, tutor, person
98 if model_object.object.__class__ == person.Person:
99 global_id = model_object.object.global_id
100 return model_object.object.__class__.objects.filter(global_id=global_id).exists()
101 elif model_object.object.__class__ == student.Student:
102 registration_id = model_object.object.registration_id
103 return model_object.object.__class__.objects.filter(registration_id=registration_id).exists()
104 elif model_object.object.__class__ == tutor.Tutor:
105 external_id = model_object.object.external_id
106 return model_object.object.__class__.objects.filter(external_id=external_id).exists()
107 return True

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