In Python When i am importing a class from another file and executing current program then it also executing imorted file program too

Question

1st file which i will import is named tuple1.py is written below

class StudentDetails:
    def __init__(self,name,rollno) -> None:
        self.name=name
        self.rollno=rollno


students = [
    StudentDetails("name1", 1), 
    StudentDetails("name2", 2),
    StudentDetails("name3", 3)
]
for i in students:
    print(i.name,i.rollno)

second file which i am executing is given below

from tuple1 import StudentDetails
s =StudentDetails("abc", 11)
print(s.name,s.rollno)