Traverse through 2 dimensional list

A list is a data structure that holds an ordered collection of items i.e. you can store a sequence of items in a list
Slicing the list and manipulating the list is easy in python. Since its a sequence is iterable, we can use for loop on list. "Sequence in Python, sequence is the generic term for an ordered set.Lists are the most versatile sequence type. The elements of a list can be any object, and lists are mutable - they can be changed. Elements can be reassigned or removed, and new elements can be inserted" python two dimensional list

Python TRIE

Python implementation for TRIE


TRIE is very interesting data structure and its very much used in word suggestion algorithms. Python implementation for this would easiest way to learn it.



Python Trie example 1

Python Generator

Have you ever  think through how to build an function that generate infinite series ?
You might be  thinking why can't we use an infinite loop! the problem is you can't come of the loop and again resume from the position/state where you stopped .

But generators helps in this case, they are just like functions but the difference is they have yield keyword in the definition which is like a return wrapped with generator-iterator object

"When you call either a function or a generator, a stackframe is created. It has the local variables
(including the arguments passed into the function),a code pointer to the active opcode, and a stack for pending try-blocks,with-blocks, or loops.

In a regular function, execution begins immediately.When return is encountered, the final result is kept and the stackframe is freed along with everything it referenced.

In a generator function, the stackframe is wrapped in a generator-iterator object and returned immediately. The code in the generator function only runs when called by next(g) or g.send(v). Execution is suspended when yield is encountered. "



Python generator infinite sequence example

Python generator things to be known ( exhausted generator )