class MyClass (object):
    def method1(self, param_tuple):
        self.local_list = []
        for element in param_tuple:
            if element > 10:
                self.local_list.append(element)

    def method2(self):
        self.sum_int = 0
        for element in self.local_list:
            self.sum_int += element
        return self.sum_int


inst1 = MyClass()
inst2 = MyClass()
inst1.method1([1, 2, 3])
print(inst1.local_list)  # Line 1
inst1.method1([10, 11, 12])
print(inst1.local_list)  # Line 2
print(inst1.method2())  # Line 3
# inst2.method2()  # Line 4
