</br>

Learn the following modules by heart. Just knowing all of the following items will made most of the problem one-liners.

01. [itertools - Functions creating iterators for efficient looping](https://docs.python.org/3/library/itertools.html) - They will help you, more often than you think

02. [collections - High-performance container datatypes](https://docs.python.org/3/library/collections.html) - Believe me, this is pretty awesome

03. [heapq - Heap queue algorithm](https://docs.python.org/3/library/heapq.html) - Obviously, we don't have to hand-code heaps anymore

04. [bisect - Array bisection algorithm](https://docs.python.org/3/library/bisect.html) - Binary Search, simplified

05. [Set](https://docs.python.org/3/library/stdtypes.html#set)

06. [Dict](https://docs.python.org/3/library/stdtypes.html#mapping-types-dict) - Now on, hash Tables are fun to work with

07. [Sorting](https://wiki.python.org/moin/HowTo/Sorting) - Don't participate in competitions without reading this completely.

08. Start using lambda extensively

09. [functools](https://docs.python.org/3/library/functools.html)

10. Apart from these, all the builtin methods of default containers.

11. [Understanding slice notation](https://stackoverflow.com/questions/509211/understanding-slice-notation) - you will need/use it more than you can imagine