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🔄 How to define a class variable shared among all instances of a class in Python?
In Python, if you want to define a variable that is shared across all instances of a class, you should define it outside of any method but inside the class — this is called a class variable.
---
✅ Correct answer to the question:
> How would you define a class variable that is shared among all instances of a class in Python?
🟢 Option 2: Outside of any method at the class level
---
🔍 Let’s review the other options:
🔴 Option 1: Inside the constructor method using self
This creates an instance variable, specific to each object, not shared.
🔴 Option 3: As a local variable inside a method
Local variables are temporary and only exist inside the method scope.
🔴 Option 4: As a global variable outside the class
Global variables are shared across the entire program, not specific to class instances.
---
🚗 Simple Example: Class Variable in Action
---
💡 Key Takeaways:
-
- Class-level variables (outside methods) are shared across all instances.
- Perfect for shared attributes like constants, counters, or shared settings.
#Python #OOP #ProgrammingTips #PythonLearning #CodeNewbie #LearnToCode #ClassVariables #PythonBasics #CleanCode #CodingCommunity #ObjectOrientedProgramming
👨💻 From: https://t.iss.one/DataScienceQ
In Python, if you want to define a variable that is shared across all instances of a class, you should define it outside of any method but inside the class — this is called a class variable.
---
✅ Correct answer to the question:
> How would you define a class variable that is shared among all instances of a class in Python?
🟢 Option 2: Outside of any method at the class level
---
🔍 Let’s review the other options:
🔴 Option 1: Inside the constructor method using self
This creates an instance variable, specific to each object, not shared.
🔴 Option 3: As a local variable inside a method
Local variables are temporary and only exist inside the method scope.
🔴 Option 4: As a global variable outside the class
Global variables are shared across the entire program, not specific to class instances.
---
🚗 Simple Example: Class Variable in Action
class Car:
wheels = 4 # ✅ class variable, shared across all instances
def __init__(self, brand, color):
self.brand = brand # instance variable
self.color = color # instance variable
car1 = Car("Toyota", "Red")
car2 = Car("BMW", "Blue")
print(Car.wheels) # Output: 4
print(car1.wheels) # Output: 4
print(car2.wheels) # Output: 4
Car.wheels = 6 # changing the class variable
print(car1.wheels) # Output: 6
print(car2.wheels) # Output: 6
---
💡 Key Takeaways:
-
self. creates instance variables → unique to each object.- Class-level variables (outside methods) are shared across all instances.
- Perfect for shared attributes like constants, counters, or shared settings.
#Python #OOP #ProgrammingTips #PythonLearning #CodeNewbie #LearnToCode #ClassVariables #PythonBasics #CleanCode #CodingCommunity #ObjectOrientedProgramming
👨💻 From: https://t.iss.one/DataScienceQ
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🚀 How to Call a Parent Class Method from a Child Class in Python?
Let's dive in and answer this popular interview-style question! 👨💻👩💻
---
🔥 Question:
How can you call a method of the parent class from within a method of a child class?
---
✅ Correct Answer:
Option 1: Using the
👉 Why?
- In Python,
- It's clean, elegant, and also supports multiple inheritance properly.
---
✅ Quick Example:
🛠 Output:
---
🔥 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
---
🎯 Conclusion:
✅ Always use s
---
📚 Hashtags:
#Python #OOP #Inheritance #super #PythonTips #Programming #CodeNewbie #LearnPython
🔚 Channel:
https://t.iss.one/DataScienceQ
Let's dive in and answer this popular interview-style question! 👨💻👩💻
---
🔥 Question:
How can you call a method of the parent class from within a method of a child class?
---
✅ Correct Answer:
Option 1: Using the
super() function👉 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.
---
✅ 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()
🛠 Output:
Hello from Child!
Hello from Parent!
---
🔥 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.---
🎯 Conclusion:
✅ Always use s
uper() inside child classes to call parent class methods — it's the Pythonic way! 🐍✨---
📚 Hashtags:
#Python #OOP #Inheritance #super #PythonTips #Programming #CodeNewbie #LearnPython
🔚 Channel:
https://t.iss.one/DataScienceQ
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🔥 Simple Explanation:
- In Python, we use the
- There’s no keyword like
-
-
---
✅ A Simple Example:
🔹 Here:
-
-
And for both, the
---
🎯 Conclusion:
✅ So, always use
#Python #OOP #Class #Inheritance #PythonBasics #Programming #LearnPython
👨💻 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).- There’s 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.---
✅ A Simple Example:
class Animal:
pass
class Dog(Animal):
pass
🔹 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! 🎯---
🎯 Conclusion:
✅ 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
👨💻 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
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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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---
🌟 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())
---
🔍 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? That’s 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 you’d have to manually write the class name (e.g., MyClass.my_variable).---
- If you want to work with an instance ➡️ Use a regular method with
self. - If you want to work directly with the class ➡️ Use
@classmethod. Which method do you like more? Drop your thoughts in the comments! 🗣️
#Python #ProgrammingTips #PythonClass
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