Python Deque

python_deque.py

class Deque():
    """Deque DST"""

    def __init__(self):
        self._items = []

    def add_front(self, item):
        """
        Add to the front
        """
        self._items.append(item)

    def add_rear(self, item):
        """
        Add to the back
        """
        self._items.insert(0, item)

    def remove_front(self):
        """
        Remove from the front
        """
        return self._items.pop()

    def remove_rear(self):
        """
        Remove from the back
        """
        return self._items.pop(0)

    def size(self):
        """
        Get the size
        """
        return len(self._items)