Python Magic Methods
Magic methods in Python are special methods surrounded by double underscores (e.g., __init__, __str__) that allow you to integrate Python’s built-in functionalities into your custom classes. These methods enable you to perform specific operations and enhance the structure and usability of your classes.
Key Python Magic Methods Explained
1. __init__ Method
The __init__ method, often called the constructor, initializes a class’s attributes when an instance is created. It is called automatically, just like constructors in languages such as C++, Java, or PHP.
Code Example:
# Python program to demonstrate the __init__ method
class Methods:
def __init__(self, name, std, marks):
print("The __init__ method has been called!")
self.name = name
self.std = std
self.marks = marks
# Creating an instance of the class
student = Methods("Itika", 11, 98)
print(f"Name: {student.name}, Standard: {student.std}, Marks: {student.marks}")
Output:
The __init__ method has been called!
Name: Itika, Standard: 11, Marks: 98
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2. __new__ Method
The __new__ method creates a new instance of a class before initializing it. It’s implicitly called before __init__ and can be used to customize object creation.
Code Example:
class Method:
def __new__(cls):
print("Creating an instance using __new__ method")
return super().__new__(cls)
def __init__(self):
print("Initializing the instance with __init__ method")
# Creating an instance
Method()
Output:
Creating an instance using __new__ method
Initializing the instance with __init__ method
3. __add__ Method
The __add__ method allows you to define custom behavior for the + operator. It can be used to add attributes of class instances.
Code Example Without __add__:
class Method:
def __init__(self, value):
self.attribute = value
# Creating instances
instance_1 = Method("Attribute")
instance_2 = Method(" 27")
# Concatenating attributes
print(instance_1.attribute + instance_2.attribute)
Output:
Attribute 27
Code Example With __add__:
class Method:
def __init__(self, value):
self.attribute = value
def __add__(self, other):
return self.attribute + other.attribute
# Creating instances
instance_1 = Method("Attribute")
instance_2 = Method(" 27")
# Adding attributes
print(instance_1 + instance_2)
Output:
Attribute 27
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4. __repr__ Method
The __repr__ method provides a string representation of an object, which is helpful for debugging and logging.
Code Example:
class Method:
def __init__(self, x, y, z):
self.x = x
self.y = y
self.z = z
def __repr__(self):
return f"Method(x={self.x}, y={self.y}, z={self.z})"
# Creating an instance
instance = Method(4, 6, 2)
print(instance)
Output:
Method(x=4, y=6, z=2)
5. __contains__ Method
The __contains__ method is called when using the in keyword to check for membership.
Code Example:
class Method:
def __init__(self, container):
self.container = container
def __contains__(self, item):
return item in self.container
# Creating an instance
instance = Method([4, 6, 8, 9, 1])
# Checking for membership
print(4 in instance) # True
print(5 in instance) # False
Output:
True
False
6. __call__ Method
The __call__ method enables you to call an instance like a function.
Code Example:
class Method:
def __init__(self, multiplier):
self.multiplier = multiplier
def __call__(self, value):
return self.multiplier * value
# Creating an instance
instance = Method(7)
print(instance(5)) # Output: 35
7. __iter__ Method
The __iter__ method makes an object iterable, allowing it to be used in loops.
Code Example:
class Method:
def __init__(self, start, stop):
self.start = start
self.stop = stop
def __iter__(self):
for num in range(self.start, self.stop + 1):
yield num ** 2
# Iterating over an instance
for square in Method(3, 8):
print(square)
Output:
9
16
25
36
49
64
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