Week 12
Constant time access and review
We studied constant time access and reviewed all materials which we leaned in this course. 
Python dictionaries can insert, find item in constant time. The references to elements of the list are stored in consecutive memory locations. 
Python lists are accessed by index. A string, or a tuple, can be converted into an integer, using a hash function. Python has a built_in function called that converts immutable object to 32 or 64 bit integers.

After I learned Constant time access, I reviewed lectures from week 1 to week 11. I found that I still did not understand the structure of LinkedList. I will review it carefully to prepare for Final exam.