Need Python Codes for the following functions:

Use List to create a stack, where the top of the stack points to the List's last element. (a) def push (list, item): # Adds an element at the top of the stack (b) def pop(list): # Removes and returns an element at top of the stack (c) def top(list): # Returns (but doesn't remove) element at top of stack (d) def empty(list): # Returns True if the stack is empty else return False