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# -----------------------------------------------------------

# create a stack class

#o

# (C) 2015 Frank Hofmann, Berlin, Germany

# Released under GNU Public License (GPL)

# email frank.hofmann@efho.de

# -----------------------------------------------------------

#

# stack class

class Stack:

def __init__(self):

"initiate this object"

self.items = []

return

def push(self, item):

"store an item on the stack"

self.items.append(item)

return

def pop(self):

"retrieve an item from the stack"

if not self.isEmpty():

return self.items.pop()

else:

return False

def isEmpty(self):

"check for an empty stack"

return (self.items == [])

def size(self):

"count the elements on the stack"

return len(self.items)

# main program

stack = Stack()

# define data

data = [15, 7, [4, 23], 39]

# go through it step by step

for item in data:

if isinstance(item, int):

# we have an integer

stack.push(item)

elif isinstance(item, list):

# we have a list of integers

for listItem in item:

stack.push(listItem)

# count total

total = 0

# take the items from the stack

while not stack.isEmpty():

value = stack.pop()

print ("added %i to %i" % (value, total))

total += value

# output total

print ("total:", total)