๐ How to Call a Parent Class Method from a Child Class in Python?
Let's dive in and answer this popular interview-style question! ๐จโ๐ป๐ฉโ๐ป
---
๐ฅ Question:
How can you call a method of the parent class from within a method of a child class?
---
โ Correct Answer:
Option 1: Using the
๐ Why?
- In Python,
- It's clean, elegant, and also supports multiple inheritance properly.
---
โ Quick Example:
๐ Output:
---
๐ฅ Let's Review Other Options:
- Option 2: Directly calling parent method (like
- Option 3: Creating an instance of the parent class is incorrect; you should not create a new parent object.
- Option 4: p
---
๐ฏ Conclusion:
โ Always use s
---
๐ Hashtags:
#Python #OOP #Inheritance #super #PythonTips #Programming #CodeNewbie #LearnPython
๐ Channel:
https://t.iss.one/DataScienceQ
Let's dive in and answer this popular interview-style question! ๐จโ๐ป๐ฉโ๐ป
---
๐ฅ Question:
How can you call a method of the parent class from within a method of a child class?
---
โ Correct Answer:
Option 1: Using the
super()
function๐ Why?
- In Python,
super()
is the standard way to access methods and properties of a parent class from inside a child class.- It's clean, elegant, and also supports multiple inheritance properly.
---
โ Quick Example:
class Parent:
def greet(self):
print("Hello from Parent!")
class Child(Parent):
def greet(self):
print("Hello from Child!")
super().greet() # Calling parent class method
# Create an instance
child = Child()
child.greet()
๐ Output:
Hello from Child!
Hello from Parent!
---
๐ฅ Let's Review Other Options:
- Option 2: Directly calling parent method (like
Parent.greet(self)
) is possible but not recommended. It tightly couples the child to a specific parent class name.- Option 3: Creating an instance of the parent class is incorrect; you should not create a new parent object.
- Option 4: p
arent_method()
syntax without reference is invalid.---
๐ฏ Conclusion:
โ Always use s
uper()
inside child classes to call parent class methods โ it's the Pythonic way! ๐โจ---
๐ Hashtags:
#Python #OOP #Inheritance #super #PythonTips #Programming #CodeNewbie #LearnPython
๐ Channel:
https://t.iss.one/DataScienceQ
๐7๐ฅ1๐1
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๐ฅ Simple Explanation:
- In Python, we use the
- Thereโs no keyword like
-
-
---
โ A Simple Example:
๐น Here:
-
-
And for both, the
---
๐ฏ Conclusion:
โ So, always use
#Python #OOP #Class #Inheritance #PythonBasics #Programming #LearnPython
๐จโ๐ป From: https://t.iss.one/DataScienceQ
- In Python, we use the
class
keyword to define any class (whether it's a base class or a child class).- Thereโs no keyword like
inherit
, superclass
, or parent
in Python.-
inherit
means "to inherit," but it's not a Python keyword.-
superclass
and parent
are just concepts, not keywords.---
โ A Simple Example:
class Animal:
pass
class Dog(Animal):
pass
๐น Here:
-
Animal
is a base class (or parent class).-
Dog
is a child class that inherits from Animal
.And for both, the
class
keyword is used! ๐ฏ---
๐ฏ Conclusion:
โ So, always use
class
to define any class in Python (whether it's a parent or child class). #Python #OOP #Class #Inheritance #PythonBasics #Programming #LearnPython
๐จโ๐ป From: https://t.iss.one/DataScienceQ
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How to Dynamically Create a Class at Runtime in Python?
You can dynamically create a class in Python using the built-in
Example:
Explanation:
*
*
*
Output:
This is a powerful feature used in metaprogramming and framework design.
#PythonTips #Metaclass #PythonOOP #DynamicClass #typeFunction #AdvancedPython #CodingTips
๐บhttps://t.iss.one/DataScienceQ
You can dynamically create a class in Python using the built-in
type()
function. This is one of the simplest ways to leverage metaclasses.Example:
# Create a new class dynamically
MyDynamicClass = type('MyDynamicClass', (object,), {
'say_hello': lambda self: print("Hello!")
})
# Use the dynamically created class
obj = MyDynamicClass()
obj.say_hello()
Explanation:
*
'MyDynamicClass'
: Name of the new class*
(object,)
: Tuple of base classes (here, just inheriting from object
)*
{'say_hello': ...}
: Dictionary of attributes/methods for the classOutput:
Hello!
This is a powerful feature used in metaprogramming and framework design.
#PythonTips #Metaclass #PythonOOP #DynamicClass #typeFunction #AdvancedPython #CodingTips
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---
๐ Scenario:
Imagine you have a variable in a class and want to access it in a method. For example:
class MyClass:
my_variable = "I am a class variable"
def my_method(self):
return f"Accessing variable: {self.my_variable}"
# Test
obj = MyClass()
print(obj.my_method())
---
๐ Explanation:
- In this example,
my_method
is a regular instance method with the self
argument. - You can access the class variable with
self.my_variable
, but you need to create an instance of the class (obj = MyClass()
). - What if you want to access it without creating an instance? Thatโs where
@classmethod
comes in! ---
If you want to access the variable directly using the class name, use
@classmethod
:class MyClass:
my_variable = "I am a class variable"
@classmethod
def my_method(cls):
return f"Accessing variable: {cls.my_variable}"
# Test
print(MyClass.my_method())
---
- In the first case (regular method), you need to create an instance to call the method.
- In the second case (with
@classmethod
), you can call the method directly with the class name (
MyClass.my_method()) and
cls gives you access to class variables. - Another option is
@staticmethod
, but youโd have to manually write the class name (e.g., MyClass.my_variable
).---
- If you want to work with an instance โก๏ธ Use a regular method with
self
. - If you want to work directly with the class โก๏ธ Use
@classmethod
. Which method do you like more? Drop your thoughts in the comments! ๐ฃ๏ธ
#Python #ProgrammingTips #PythonClass
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