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a = 1
class MyClass:
    """A simple example class"""
    i = 123
    def f(self):
        return 'hello world'
x = MyClass()
MyClass().f()
MyClass.f
MyClass.i = 10
x = MyClass()
x.i

class Student():
    def __init__(self,name,scores):
        self.name = name
        if len(scores) == 3:
            self.scores = scores
        else:
            self.scores = [0] * 3

stu_1 = Student('小明',['80','90','70'])
stu_1.name
stu_1.scores