namedtuples anamoly

[Vinodhini Balusamy]

Hi,

I tried using namedtuples and just found a behaviour which I am not able to
conclude as correct behaviour.

from collections import namedtuple

(n, categories) = (int(input()), input().split())
Grade = namedtuple('Grade', categories)
Grade.ID = 1
#print(Grade.ID)
ob = Grade(10, 50)
print(ob.ID)
print(ob.MARKS)
ob1 = Grade(20, 100)
print(ob1.ID)

2
ID MARKS
1
50
1
100


If we set GRADE.ID =1 , it has impact on all variables. Is this behaviour
just like class variable and it has global scope.
I expected ob.ID and ob1.ID to be 10.

Correct me if Iam wrong.
Appreciate any quick response.

Kind Rgds,
Vinu