问题描述
我有这个类的代码:
class Triangle(object): def __init__(self, side1, side2, side3): self.side1 = side1 self.side2 = side2 self.side3 = side3 def perimeter(self): return "Perimeter = %s" % (side1 + side2 + side3) a = Triangle(3, 4, 5) print(a.perimeter())
运行此代码会引发异常:
Running this code throws an exception:
Traceback (most recent call last): File "untitled.py", line 12, in <module> print(a.perimeter()) File "untitled.py", line 9, in perimeter return "Perimeter = %s" % (side1 + side2 + side3) NameError: name 'side1' is not defined
perimeter方法中怎么访问不到side1?
推荐答案
替换
return "Perimeter = %s" %(side1 + side2 + side3)
到
return "Perimeter = %s" %(self.side1 + self.side2 + self.side3)
你错过了添加self