Скачать или смотреть How to Properly Override the + Operator in Python 2.7

Learn how to properly override the `+` operator in Python 2.7 by defining custom behavior for object addition in your classes.
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In Python, operators like + can be overridden to provide custom functionality for object addition within user-defined classes. This allows for more flexible and intuitive code, especially when working with complex data structures. Here's a guide to correctly overriding the + operator in Python 2.7.

Step-by-Step Guide to Override the + Operator

To override the + operator, you need to define the _add_ method within your class. Here's a simple example to illustrate this:

Create Your Class

Define the class where you want to override the + operator. For this example, let's consider a Vector class.

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Implement the _add_ Method

The _add_ method needs to accept two parameters: self (representing the left operand) and other (representing the right operand). Inside this method, you will define how the + operator should behave when used with instances of your class.

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Instantiate and Use the Class

Create instances of your class and use the + operator to see the custom behavior in action.

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Handling Edge Cases

When overriding the + operator, it's important to consider and handle cases where the other operand might not be an instance of your class. For example:

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Conclusion

Overriding the + operator in Python 2.7 by defining the _add_ method gives you the ability to customize how objects of your class interact with each other. This is particularly useful in mathematical computations, graphics programming, and other areas where custom object behavior enhances code readability and functionality.

By following the simple steps outlined above, you should be well on your way to implementing your own custom operator behavior in Python 2.7.