python stack top element code example
Example 1: stack data structure python
from collections import deque
myStack = deque()
myStack.append('a')
myStack.append('b')
myStack.append('c')
myStack
deque(['a', 'b', 'c'])
myStack.pop()
'c'
myStack.pop()
'b'
myStack.pop()
'a'
myStack.pop()
Example 2: stack using array python
class ArrayStack:
def __init__(self):
self._data = []
def __len(self):
return len(self._data)
def is_empty(self):
return len(self._data) == 0
def push(self, e):
self._data.append(e)
def pop(self):
if self.is_empty():
raise Empty('stack is empty')
else:
return self._data.pop()
def top(self):
if self.is_empty():
raise Empty('Stack is empty')
else:
return self._data[-1]
@property
def data(self):
return self._data
class Empty(Exception):
pass
Example 3: python stack data structure
>>> from collections import deque
>>> myStack = deque()
>>> myStack.append('a')
>>> myStack.append('b')
>>> myStack.append('c')
>>> myStack
deque(['a', 'b', 'c'])
>>> myStack.pop()
'c'
>>> myStack
deque(['a', 'b'])