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Comparison Magic Methods | Magic Methods
In-Depth Python OOP

# Comparison Magic Methods

Similarly to the mathematical magic methods, here we take `self` and `other` as arguments and compare their desired attributes. These magic methods should always return `True` or `False`.

 Magic Method Operation `__eq__(self, other)` `==` `__gt__(self, other)` `>` `__ge__(self, other)` `>=` `__lt__(self, other)` `<` `__le__(self, other)` `<=` `__ne__(self, other)` `!=`

Note

To understand the naming of these methods, look at some examples:

• `eq` is `eq`ual.
• `gt` is `g`reater `t`han.
• `le` is `l`ess or `e`qual.
• `ne` is `n`ot `e`qual.

Look at the example of `Road` class:

Code Description
The `Road` class has implemented the `__eq__` method, which is the equality operator (`==`) in Python. This method allows objects of the `Road` class to be compared for equality with other objects.

The `__eq__` method first checks if the `other` object is an instance of the `Road` class using the `isinstance()` function. If it is, it compares the `length` attribute of the current `Road` object (`self.length`) with the `length` attribute of the `other` `Road` object (`other.length`). If the `other` object is not an instance of the `Road` class, it assumes that `other` is a numeric value and compares the `length` attribute of the current `Road` object (`self.length`) with the `other` value directly.

In summary, the `__eq__` method of the `Road` class allows two `Road` objects to be compared for equality based on their `length` attributes. It also allows a `Road` object to be compared with a numeric value for equality, considering only the `length` attribute of the `Road` object.

Note

To optimize the code, you can utilize existing comparison methods. For example, if you have implemented the `__lt__()` method (`<`), by implementing the `__ge__()` method (`>=`), you can use `return not (instance1 < instance2)` which will return the opposite result of the already implemented `<` operator.

Which magic method should be used?

Select the correct answer

Everything was clear?

Section 5. Chapter 4

Course Content

In-Depth Python OOP

# Comparison Magic Methods

Similarly to the mathematical magic methods, here we take `self` and `other` as arguments and compare their desired attributes. These magic methods should always return `True` or `False`.

 Magic Method Operation `__eq__(self, other)` `==` `__gt__(self, other)` `>` `__ge__(self, other)` `>=` `__lt__(self, other)` `<` `__le__(self, other)` `<=` `__ne__(self, other)` `!=`

Note

To understand the naming of these methods, look at some examples:

• `eq` is `eq`ual.
• `gt` is `g`reater `t`han.
• `le` is `l`ess or `e`qual.
• `ne` is `n`ot `e`qual.

Look at the example of `Road` class:

Code Description
The `Road` class has implemented the `__eq__` method, which is the equality operator (`==`) in Python. This method allows objects of the `Road` class to be compared for equality with other objects.

The `__eq__` method first checks if the `other` object is an instance of the `Road` class using the `isinstance()` function. If it is, it compares the `length` attribute of the current `Road` object (`self.length`) with the `length` attribute of the `other` `Road` object (`other.length`). If the `other` object is not an instance of the `Road` class, it assumes that `other` is a numeric value and compares the `length` attribute of the current `Road` object (`self.length`) with the `other` value directly.

In summary, the `__eq__` method of the `Road` class allows two `Road` objects to be compared for equality based on their `length` attributes. It also allows a `Road` object to be compared with a numeric value for equality, considering only the `length` attribute of the `Road` object.

Note

To optimize the code, you can utilize existing comparison methods. For example, if you have implemented the `__lt__()` method (`<`), by implementing the `__ge__()` method (`>=`), you can use `return not (instance1 < instance2)` which will return the opposite result of the already implemented `<` operator.

Which magic method should be used?

Select the correct answer

Everything was clear?

Section 5. Chapter 4