Hey internet mates here we are going to make a python program to demonstrate working of queue in python.
Program code:- def cls(): print("\n" * 100) def isEmpty(Qu): if Qu == [] : return True else: return False def Enqueue (Qu, item): Qu.append(item) if len (Qu)==1: front = rear = 6 else : rear=len(Qu)-1 def Dequeue(Qu): if isEmpty(Qu): return "Underflow" else: item=Qu.pop(0) if len(Qu)==0: front=rear=None #if it was single-element queue return item def Peek (Qu): if isEmpty(Qu): return Underflow else: front=0 return Qu[front] def Display (Qu): if isEmpty (Qu): print("Queue Empty!") elif len(Qu) == 1: print(Qu[0], "<==front, rear") else: front =0 rear=len(Qu)-1 print(Queue[front]," <-front") for a in range(1, rear ): print(Qu[a]) print(Queue[rear], "<-rear") #_main_program queue = [] front=None while True: cls() print("QUEUE OPERATIONS") print("1. Enqueue") print("2.Dequeue") print("3. Peek") print("4. Display queue") print("5. Exit") ch=int (input("Enter your choice ( 1-5): ")) if ch==1: item= int(input("Enter item :")) Enqueue (queue, item) input("Press Enter to continue...") elif ch==2: item = Dequeue (queue) if item== ("Underflow"): print("Underflow Queue is empty!") else: print("Dequeue-ed item is", item) input("Press enter to continue...") elif ch==3: item=Peek (queue) if item=="Underflow": print("Queue is empty!") else : print("Frontmost item is", item) input("Press Enter to continue...") elif ch == 4: Display(queue) input("Press Enter to continue...") elif ch == 5: break else: print("Invalid choice!") input("Press Enter to continue...")


