以下Python代码的运行结果为？
class Student:
grade = 1
def __init__(self, name):
self.name = name
def change_grade(self, new_grade):
grade = new_grade
s1 = Student('张三')
s2 = Student('李四')
s1.change_grade(2)
print(s1.grade, s2.grade)
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子题
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