Authors: Zolomon, Greg Hewgill, Andrew Jaffe
It is a good note post to make sure we remember what is [] vs. {} vs. ()
() - tuple
A tuple is a sequence of items that can't be changed (immutable).[] - list
A list is a sequence of items that can be changed (mutable).{} - dictionary or set
A dictionary is a list of key-value pairs, with unique keys (mutable). From Python 2.7/3.1,{} can also represent a set of unique values (mutable).
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