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structures.py

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class Node:

def __init__(self, item, next):

self.item = item

self.next = next

class Stack:

def __init__(self):

self.top = None

def push(self, value):

self.top = Node(value, self.top)

def pop(self):

if self.top is None:

return None

node = self.top

self.top = self.top.next

return node.item

def is_empty(self):

return self.top is None

if __name__ == "__main__":

s = Stack()

s.push(1)

print(s.top)

print(s.pop())

# intArray = [73,74,75,71,69,72,76,73]