**PYTHON**

Colab(ipynb)

Using the Stack class provided, write a method invert() to invert the contents of the stack. You may use additional stacks in your function. Note: If the number 3 is at the top of the stack s, after calling s.invert(), 3 will be at the bottom of s.

class Stack: def __init__(self): def push(self, value): def pop(self)

class Stack:

def __init__(self):

self.top = -1

#this stack is implemented with Python list (array)

self.data = []

def push(self, value):

#increment the size of data using append()

self.data.append(0)

self.top += 1

self.data[self.top] = value

def pop(self):

value = self.data[self.top]

#delete the top value using del

del self.data[self.top]

self.top -= 1

return value

def isEmpty(self):

return (self.top == -1)

def peek(self):

pass

def printStack(self):

print(self.data)