How to return couple of variables in models.py [duplicate]

i need to return shop_nama nad adress to django site administration, here's the code

    shop_id = models.AutoField(primary_key=True, unique=True)
    shop_name = models.CharField(max_length=264)
    adress = models.TextField(max_length=264, default='')

    def __str__(self):
        return self.shop_name

but it shows error when i type return self.shop_name, self.adress error says: str returned non-string (type tuple)

sooo how to fix this problem?

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