class Stack:
def __init__(self):
self.storage = LinkedList()
def __repr__(self):
return f"{self.storage}"
def __len__(self):
return len(self.storage)
def push(self, value):
self.storage.add_to_tail(value)
def pop(self):
if len(self.storage) > 0:
return self.storage.remove_from_tail()
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.add_to_end(value)
def pop(self):
if self.size != 0:
self.size -= 1
return self.storage.remove_from_tail()
else:
return None
class Stack:
def __init__(self):
self.size = 0
self.storage = LinkedList()
def __len__(self):
if self.size >= 0:
return self.size
else:
return 0
def push(self, value):
self.storage.add_to(value)
self.size += 1
def pop(self):
if self.size > 0:
value = self.storage.remove_from_tail()
self.size -= 1
return value
