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In-Depth Python OOP

bookWhat are magic methods?

Python is a very flexible programming language, and the magic methods provide this flexibility.

Magic Methods are methods with specific syntax that provide functionality for different operations in Python.

For example:

# What do you use:
len(string)
a + b

# What Python does:
string.__len__()
a.__add__(b)

The a + b operator invokes the __add__() magic method of the first object (a.__add__(b)). In Python, operators like + call the corresponding magic methods of the objects involved. The __init__ magic method is called when an instance of a class is created.

Note

Magic methods have a specific syntax where the method name is enclosed in double underscores (__) at start and end of method name.

Let's take a look at an example implementation of the __add__ magic method:


              
12345678910111213

            
class Road:
    def __init__(self, length):
        self.length = length

    def __add__(self, other_road):
        return Road(self.length + other_road.length)

road_1 = Road(20)
road_2 = Road(30)
road_3 = road_1 + road_2  # road_3 = road_1.__add__(road_2)

print(type(road_3))
print(road_3.length)
copy
question mark

What syntax is used for the magic methods?

Select the correct answer

Var allt tydligt?

Hur kan vi förbättra det?

Tack för dina kommentarer!

Avsnitt 5. Kapitel 1

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bookWhat are magic methods?

Svep för att visa menyn

Python is a very flexible programming language, and the magic methods provide this flexibility.

Magic Methods are methods with specific syntax that provide functionality for different operations in Python.

For example:

# What do you use:
len(string)
a + b

# What Python does:
string.__len__()
a.__add__(b)

The a + b operator invokes the __add__() magic method of the first object (a.__add__(b)). In Python, operators like + call the corresponding magic methods of the objects involved. The __init__ magic method is called when an instance of a class is created.

Note

Magic methods have a specific syntax where the method name is enclosed in double underscores (__) at start and end of method name.

Let's take a look at an example implementation of the __add__ magic method:


              
12345678910111213

            
class Road:
    def __init__(self, length):
        self.length = length

    def __add__(self, other_road):
        return Road(self.length + other_road.length)

road_1 = Road(20)
road_2 = Road(30)
road_3 = road_1 + road_2  # road_3 = road_1.__add__(road_2)

print(type(road_3))
print(road_3.length)
copy
question mark

What syntax is used for the magic methods?

Select the correct answer

Var allt tydligt?

Hur kan vi förbättra det?

Tack för dina kommentarer!

Avsnitt 5. Kapitel 1
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