# Queues And Stacks

## Preliminaries

``````
from collections import deque``````

## Make A Queue

``````/* Option 1: Make a queue */
queue = deque(range(10))

/* Option 2: Make a queue that, if full, discards any item at the
opposite end to where you added an item. */
queue = deque(range(10), maxlen=10)``````

## Manipulate Queue

``````/* Append an item to the right */

queue.append('A')

/* View queue */
queue``````
``````deque([1, 2, 3, 4, 5, 6, 7, 8, 9, 'A'])
``````
``````/* Append an item to the left */

queue.appendleft('A')

/* View queue */
queue``````
``````deque(['A', 1, 2, 3, 4, 5, 6, 7, 8, 9])
``````
``````/* Count occurances of item */
queue.count('A')

/* View queue */
queue``````
``````deque(['A', 1, 2, 3, 4, 5, 6, 7, 8, 9])
``````
``````/* Remove and return right-most item */
queue.pop()

/* View queue */
queue``````
``````deque(['A', 1, 2, 3, 4, 5, 6, 7, 8])
``````
``````/* Remove and return left-most item */
queue.popleft()

/* View queue */
queue``````
``````deque([1, 2, 3, 4, 5, 6, 7, 8])
``````
``````/* Insert item to the right of an item */
queue.insert(2, 'A')

/* View queue */
queue``````
``````deque([1, 2, 'A', 3, 4, 5, 6, 7, 8])
``````
``````/* Reverse the queue */
queue.reverse()

/* View queue */
queue``````
``````deque([8, 7, 6, 5, 4, 3, 'A', 2, 1])
``````
``````/* Delete all items */
queue.clear()

/* View queue */
queue``````
``````deque([])
``````

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## Two Machine Learning Fields

There are two sides to machine learning:

• Practical Machine Learning:This is about querying databases, cleaning data, writing scripts to transform data and gluing algorithm and libraries together and writing custom code to squeeze reliable answers from data to satisfy difficult and ill defined questions. It’s the mess of reality.
• Theoretical Machine Learning: This is about math and abstraction and idealized scenarios and limits and beauty and informing what is possible. It is a whole lot neater and cleaner and removed from the mess of reality.

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