1 class a:
 2     def change(self, sign, call):
 3         self.first = sign
 4         self.second = call
 5     first = ‘first‘
 6     second = ‘second‘
 7 
 8 z = a()
 9 print("賦值前：sign = ", z.first)
10 c = a()
11 print("賦值前：call = ", c.second)
12 
13 z.change("hahah", "oooo")
14 print("賦值後：", z.second, z.first)

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