[Python] How do I select a random object from a list of objects?

I have a list of 10 x 10, with objects like this:

self.taula = [[casella() for i in range(10)] for j in range(10)]


How do I select a random object from this list?

I've been trying but of course I don't have any integer to use as an index, I'm pretty new to coding so I might be doing something wrong.

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