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Copy pathstack_ll.py
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108 lines (81 loc) · 1.89 KB
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## Stack Implementation using Linked list
### Covers -
##
class Node(object):
def __init__(self, data, next = None):
self.data = data
self.next = next
def pprint(self):
print "| ^" + str(self.data)
class Stack(object):
"""docstring for Stack"""
def __init__(self, limit = 1):
self.limit = limit
self.top = None
self.size = 0
def push(self, value):
node = Node(value)
if self.size == self.limit:
print "Stack Overflow"
else:
self.size += 1
node.next = self.top
self.top = node
self.pprint()
def pop(self):
if self.size == 0:
print "Stack Underflow"
else:
self.size -= 1
tmp = self.top
self.top = self.top.next
del tmp
self.pprint()
def pprint(self):
node = self.top
print "-------------> Top <------------"
while node != None:
node.pprint()
node = node.next
print "================================"
s=Stack(3)
s.push(29)
s.push(90)
s.push(12)
s.push(22)
##Sample Output
# >>> execfile('stack_ll.py')
# -------------> Top <------------
# | ^29
# ================================
# -------------> Top <------------
# | ^90
# | ^29
# ================================
# -------------> Top <------------
# | ^12
# | ^90
# | ^29
# ================================
# Stack Overflow
# -------------> Top <------------
# | ^12
# | ^90
# | ^29
# ================================
# >>> s.pop()
# -------------> Top <------------
# | ^90
# | ^29
# ================================
# >>> s.pop()
# -------------> Top <------------
# | ^29
# ================================
# >>> s.pop()
# -------------> Top <------------
# ================================
# >>> s.pop()
# Stack Underflow
# -------------> Top <------------
# ================================