[Python] How can I check if an object has an attribute?

How do I check if an object has some attribute? For example:

>>> a = SomeClass()
>>> a.property
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: SomeClass instance has no attribute 'property'


How do I tell if a has the attribute property before using it?

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