电梯直达

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发表于 2013-06-01 11:19 |只看该作者 |倒序浏览

本帖最后由 ideal_gjh 于 2013-06-01 11:20 编辑

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这个代码一直没有理解，有人详细解释下吗，3q.

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发表于 2013-06-01 13:35 |只看该作者

拿dog和数字比较的意义何在？

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发表于 2013-06-01 14:42 |只看该作者

回复 1# ideal_gjh

这个例子是哪里来的啊，给你看个例子：http://www.tutorialspoint.com/python/python_classes_objects.htm

Overloading Operators:
Suppose you've created a Vector class to represent two-dimensional vectors. What happens when you use the plus operator to add them? Most likely Python will yell at you.
You could, however, define the __add__ method in your class to perform vector addition, and then the plus operator would behave as per expectation:
EXAMPLE:
#!/usr/bin/python
class Vector:
def __init__(self, a, b):
self.a = a
self.b = b
def __str__(self):
return 'Vector (%d, %d)' % (self.a, self.b)
def __add__(self,other):
return Vector(self.a + other.a, self.b + other.b)
v1 = Vector(2,10)
v2 = Vector(5,-2)
print v1 + v2
When the above code is executed, it produces following result:
Vector(7,8)

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python __cmp__ 重载 [复制链接]

python cmp 重载 [复制链接]