为什么当我尝试访问班级中的属性时会收到 NameError?
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
?
解决方案
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
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