Question

A stack, named ClrStack, contains records of some colors. Each record is represented as a tuple containing four elements - ColorName, RED, GREEN, BLUE. ColorName is a string, and RED, GREEN, BLUE are integers. For example, a record in the stack may be (‘Yellow’, 237, 250, 68)

Write the following user-defined functions in Python to perform the specified operations on ClrStack:

1. push_Clr(ClrStack, new_Clr): This function takes the stack ClrStack and a new record new_Clr as arguments and pushes this new record onto the stack.
2. pop_Clr(ClrStack): This function pops the topmost record from the stack and returns it. If the stack is already empty, the function should display the message “Underflow".
3. isEmpty(ClrStack): This function checks whether the stack is empty. If the stack is empty, the function should return True, otherwise the function should return False.

Answer 1

1. def push_Clr(ClrStack,new_Clr):
       ClrStack.append(new_Clr)
       print("1 element pushed...")

2. def pop_Clr(ClrStack):
       if ClrStack==[]:
          print("Underflow")
   else:
        print(ClrStack.pop())

3. def isEmpty(ClrStack):
       if ClrStack==[]:
          return True
   else:
       return False