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class Queue(object):

""" Creates a queue. """

def __init__(self):

self.items = []

def __repr__(self):

if not self.length():

return '<Queue (empty)>'

else:

return '<Queue %s>' % self.items

def length(self):

return len(self.items)

def dequeue(self):

""" Removes item from the front of the queue. """

if self.items > 0:

return self.items.pop(0)

else:

raise IndexError('queue is empty.')

def enqueue(self, item):

"""Add item to end of queue::

>>> q = Queue()

>>> q.enqueue("buy flight")

>>> q.enqueue("pack")

>>> q.enqueue("enjoy vacation")

>>> q

<Queue ['buy flight', 'pack', 'enjoy vacation']>

>>> q.length()

3

"""

self.items.append(item)

def is_empty(self):

return not self.items

def peek(self):

"""Return but don't remove the first item in the queue.

>>> q = Queue()

>>> q.enqueue("buy flight")

>>> q.enqueue("pack")

>>> q.enqueue("enjoy vacation")

>>> q.peek()

'buy flight'

>>> q

<Queue ['buy flight', 'pack', 'enjoy vacation']>

"""

return self.items[0]

if __name__ == '__main__':

import doctest

results = doctest.testmod()

if not results.failed:

print("ALL TESTS PASSED!")