stack example in python
#using doubly linked list
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()
#Traceback (most recent call last):
#File "<console>", line 1, in <module>
##IndexError: pop from an empty deque
4.67
3
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
Thank you!
3
4.67
(3 Votes)
0
3
2
>>> myStack = []
>>> myStack.append('a')
>>> myStack.append('b')
>>> myStack.append('c')
>>> myStack
['a', 'b', 'c']
>>> myStack.pop()
'c'
>>> myStack.pop()
'b'
>>> myStack.pop()
'a'
>>> myStack.pop()
Traceback (most recent call last):
File "<console>", line 1, in <module>
IndexError: pop from empty list
Thank you!
2
3
(2 Votes)
0
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