Python 101 : Immutability of a Tuple.

tuple is a group of references to different items. These references or locations in memory are immutable, but the items these references point to could be mutable lists - or immutable strings -.

Sometimes the mutable elements in a tuple could create hard-to-find errors. 
We could use a hash function to check the "complete" immutability of a tuple as below:

Regarding the output, we get:
False : because "t1" contains a mutable item - list -.


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