Why "NONE" is come when my stack is print?.Please following code invoke in some other IDE for better experience it's my request.

Question

class stack:
def __init__(self):
self.item=[]
def is_empty (self):
return self.item==[]
def push (self, data):
self.item.append(data)
def pop(self):
return self.item.pop()
def display (self):
x=s.item
print (x,end="")
s=stack()
while True:
print ("what do you want to do, 1=push, 2=pop, 3=exit")
operation =int(input())
if operation==1:
print ("how many element do you want to enter")
number=int(input())
for I in range (number):
s.push(int(input("enter the value: ")))
print (s.display())
elif operation==2:
if s.is_empty():
print ("stack is empty\n")
else:
print ("popped value is :",s.pop())
elif operation ==3:
print ("Thank you!\n")
break
else:
print ("please enter valid value\n")

Answer 1

s.display () not returning anything.. So just put
s.display ()
Instead of print(s.display())

Answer 2

Jayakrishna🇮🇳 thank you!!

Answer 3

jayrv_7_ Next time share code link by saving in playground, pls.. See post by @jay sir to know how to share.

You're welcome..