array queue python code example
Example: queue with array python
class ArrayQueue:
def __init__(self):
self._data = []
self._size = 0
self._front = 0
def __len__(self):
return self._size()
def is_empty(self):
return self._size == 0
def enqueue(self, e):
self._data.append(e)
self._size = self._size + 1
def deque(self):
if self.is_empty():
raise Empty('queue is empty')
else:
value = self._data[self._front]
self._data[self._front] = None
self._front = self._front + 1
self._size = self._size - 1
return value
def first(self):
if self.is_empty():
raise Empty('queue is empty')
else:
return self._data[self._front]
class Empty(Exception):
pass