python\_\_eq\_\_
时间: 2023-09-03 20:12:37 浏览: 61
`__eq__`是Python中的一个特殊方法(也称为魔术方法),用于定义对象之间的相等性比较操作。当我们使用`==`运算符比较两个对象时,实际上是调用了左侧对象的`__eq__`方法,并将右侧对象作为参数传递给该方法。
我们可以在自定义的类中重写`__eq__`方法来定义对象的相等性比较规则。例如,假设我们有一个名为`Person`的类,我们可以通过重写`__eq__`方法来比较两个人的姓名是否相同:
```python
class Person:
def __init__(self, name):
self.name = name
def __eq__(
相关问题
python __eq__
__eq__ is a special method in Python that is used to define the equality comparison between two objects of a class. It is called when the == operator is used to compare two objects.
The syntax to define the __eq__ method is as follows:
```python
def __eq__(self, other):
# Comparison logic goes here
```
The __eq__ method takes two arguments: self, which refers to the current object, and other, which refers to the object being compared. The method should return True if the two objects are equal or False if they are not.
Here's an example:
```python
class Point:
def __init__(self, x, y):
self.x = x
self.y = y
def __eq__(self, other):
if isinstance(other, Point):
return self.x == other.x and self.y == other.y
return False
p1 = Point(1, 2)
p2 = Point(1, 2)
p3 = Point(3, 4)
print(p1 == p2) # True
print(p1 == p3) # False
```
In the above example, we define a Point class with an x and y coordinate. We then define the __eq__ method to compare two Point objects based on their x and y coordinates. We use the isinstance function to check if the other object is also a Point object before comparing the coordinates. Finally, we test the equality using the == operator.
python实现__eq
__eq__是Python中的一个特殊方法(也称为魔术方法),用于定义对象之间的相等性比较。它的作用类似于Java中的equals方法。
在Python中,我们可以通过在类中定义__eq__方法来自定义对象之间的相等性比较。该方法接受一个参数,即要比较的对象,然后返回一个布尔值,表示两个对象是否相等。
下面是一个示例代码,演示了如何在Python中实现__eq__方法:
```
class Point:
def __init__(self, x, y):
self.x = x
self.y = y
def __eq__(self, other):
if isinstance(other, Point):
return self.x == other.x and self.y == other.y
return False
p1 = Point(2, 3)
p2 = Point(2, 3)
p3 = Point(4, 5)
print(p1 == p2) # True
print(p1 == p3) # False
```
在上面的示例中,我们定义了一个Point类,并在该类中实现了__eq__方法。该方法首先检查要比较的对象是否是Point对象,然后比较它们的x和y属性是否相等。如果是,则返回True,否则返回False。
我们创建了两个Point对象p1和p2,它们的x和y属性都相等,因此p1 == p2返回True。另外,我们创建了另一个Point对象p3,它的x和y属性与p1不同,因此p1 == p3返回False。