Compare function does not work, Why?

Question

list1 = [1,2,3]
list2 = [4,5,6]
print (list1)
print (list2)
print (cmp(list1,list2))

Output:
[1, 2, 3]
[4, 5, 6]
Traceback (most recent call last):
File "python", line 5, in <module>
NameError: name 'cmp' is not defined

Answer 1

In python 3 there was no cmp module in it . so you need to do this by your self.
you can try this ..

def cmp(a,b):
return (a>b) - (a<b)

it gives same result

Answer 2

why is it removed?

Answer 3

dont know but they have to change something.from python 2

Answer 4

thanks