Bharath S R

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 Code is given below: #Stack class stack:     def __init__(self):         self.stack=[]     def push(self,value):         if value not in self.stack:             self.stack.append(value)         else:             print("Data is already there in stack...")     def pop(self):         if self.stack is None:             print("Stack is empty")         else:             self.stack.pop()             print("Popped Successfully")     def display(self):         for i in range(len(self.stack)-1,-1,-1):             print(self.stack[i])              obj=stack() print("STACK OPERATIONS") while True:     print("\nPres...

Code is given below. #QUEUE  class queue:     def __init__(self):         self.l1=[]              def add(self,data):         if data not in self.l1:             self.l1.append(data)         else:             print("Data is alreday there in queue....")     def remove(self):         self.l1.pop(0)          def display(self):         for i in self.l1:             print(i,end=' ')         print() A=queue() while True:     print("\nPress\n1.ADD ITEM\n2.REMOVE\n3.DISPLAY\n4.EXIT\n")     ch=int(input("Enter your choice : "))     if ch==1:         number=int(input("Enter the number : "))         A.add(number)     elif ch==2: ...