Queue program

 def enqueue(a,val):

    a.append(val)

    if len(a)==1:

        front=rear=0

    else:

        rear=len(a)-1 #you may ask what about the front variable well,->https://youtu.be/Xw2Kmqwq-So?t=833

def dequeue(a):

    if len(a)==0:

        print("Empty Queue:")

    else:

        x=a.pop(0)

        print("Dequeued Item=",x)

    if len(a)==0:

        front=rear=None

def peek(a):

    if len(a)==0:

        print("Empty queue:")

    else:

        front=0

        print(a[front])

def display(a):

    if len(a)==0:

        print("Empty")

    else:

        for i in range(len[a])

         print(a[i])

    

a=[]

front=rear=None

while True:

    ch=int(input(int("1->Enqueue\n2->Dequeue\n3->peek\n4->Display\n5->Exit\nEnter your choice:"))

    if ch==1:

        val=int(input("Enter Value:"))

        enqueue(a,val)

    if ch==2:

         dequeue(a)

    if ch==3:

          peek(a)

    if ch==4:

          display(a)