class Stack:
def __init__(self):
self.size = 0
self.storage = LinkedList()
def __len__(self):
return self.size
def push(self, value):
self.size += 1
self.storage.prepend(value)
def pop(self):
if self.size == 0:
return None
else:
self.size -= 1
return self.storage.remove_head()
class Stack:
def __init__(self):
self.size = 0
self.storage = LinkedList()
def __len__(self):
return self.size
# current = self.storage.head
# count = 0
# while current:
# current = current.get_next()
# count += 1
# return count
def push(self, value):
self.size += 1
return self.storage.prepend(value)
def pop(self):
if self.size > 0:
self.size -= 1
return self.storage.remove_head()
