Python Coding challenge - Day 989| What is the output of the following Python Code?

 

Code Explanation:

1. Class Definition

class Device:

    mode = "auto"

Explanation:

class Device:

→ This defines a class named Device.

mode = "auto"

→ This is a class variable.

It belongs to the class itself, not to any specific object.

All objects of Device can access this variable unless overridden.

2. Creating an Object

d = Device()

Explanation:

Device()

→ Creates a new object (instance) of the Device class.

d =

→ Stores that object in the variable d.

At this point:

d does not have its own mode

It uses Device.mode → "auto"

3. Accessing the Variable

print(d.mode)

Explanation:

Python looks for mode inside object d.

Since d has no instance variable called mode,

Python checks the class variable Device.mode.

Output:

auto

4. Modifying the Variable

d.mode = "manual"

Explanation:

This creates a new instance variable mode inside d only.

It does NOT change the class variable.

Now:

d.mode → "manual"

Device.mode → "auto"

5. Printing Class vs Object Variable

print(Device.mode, d.mode)

Explanation:

Device.mode

→ Refers to the class variable → "auto"

d.mode

→ Refers to the instance variable → "manual"

Output:

 auto auto manual

100 Python Programs for Beginner with explanation

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Python Coding challenge - Day 988| What is the output of the following Python Code?

 

Code Explanation:

1. Defining the Class

class Player:

    def play(self): 

        return "playing"

A class named Player is defined.

It has a method play() that returns the string "playing".

At this point:

Player.play → method

2. Creating an Instance

p = Player()

An object p of class Player is created.

Initially, p does not have its own play attribute.

Method lookup would normally find play on the class.

3. Assigning a New Attribute on the Instance

p.play = lambda: "paused"

This line creates an instance attribute named play.

The instance attribute shadows (overrides) the class method.

Now:

p.__dict__["play"] → lambda: "paused"

Important:

Instance attributes have higher priority than class attributes during lookup.

4. Calling p.play()

print(p.play())

Step-by-step:

Python looks for play on the instance p.

Finds the instance attribute (lambda: "paused").

Calls the lambda.

Returns "paused".

5. Final Output

paused

Final Answer

✔ Output:

paused

100 Python Programs for Beginner with explanation

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Python Coding challenge - Day 987 | What is the output of the following Python Code?

 

Code Explanation:

1. Defining the Class

class Engine:

A class named Engine is defined.

2. Defining the Method start

    def start(self):

        self.start = "running"

        return "init"

This method does two important things:

Creates an instance attribute named start

self.start = "running"

This overwrites the method name on the instance.

After this line, start on the object is no longer a method.

Returns a string

return "init"

3. Creating an Object

e = Engine()

An instance e of class Engine is created.

At this point:

e.start → method (from class)

4. First Call: e.start()

e.start()

Step-by-step:

Python finds start on the class.

Calls the method.

Inside the method:

self.start = "running" creates an instance attribute

The instance attribute shadows the method.

The method returns "init".

Result of first call:

"init"

5. Second Access: e.start

e.start

Python looks for start on the instance.

Finds the instance attribute:

e.start == "running"

The method on the class is no longer used.

6. Printing Both Values

print(e.start(), e.start)

First e.start() → "init"

Second e.start → "running"

7. Final Output

init running

Final Answer

✔ Output:

init running

400 Days Python Coding Challenges with Explanation

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Machine Learning with Python : COMPLETE COURSE FOR BEGINNERS

 

Machine learning is one of the most sought-after skills in the modern tech landscape. It’s a key driver behind smart recommendations, predictive analytics, automation, and artificial intelligence. But for many beginners, the journey into machine learning can feel overwhelming — packed with unfamiliar terms, math, and programming concepts.

The Machine Learning with Python: COMPLETE COURSE FOR BEGINNERS course is designed to eliminate that intimidation. This beginner-friendly program teaches you how to understand, build, and deploy machine learning models using Python — the programming language most widely used in data science and AI. Whether you’re a student, career changer, or aspiring data scientist, this course offers a practical, step-by-step approach to learning essential machine learning concepts from the ground up.

---

Why This Course Matters

Machine learning isn’t just a buzzword; it’s a practical technology that powers real solutions in business, healthcare, finance, engineering, and beyond. As companies increasingly rely on data-driven decision-making, the demand for professionals able to implement machine learning systems continues to grow.

But many learners struggle with where to start. Do you need advanced math? What tools should you use? How do you apply models to real problems? This course answers these questions by focusing on hands-on learning, real datasets, and meaningful projects — not just theory.

---

What You’ll Learn

1. Python Programming for Machine Learning

The course begins with the foundations: Python. You’ll learn:

• Python basics and syntax

• Data structures like lists and dictionaries

• Libraries commonly used in data science (NumPy, Pandas)

You don’t need prior programming experience — this course starts from the basics and builds your confidence as you go.

---

2. Data Preprocessing and Exploration

Machine learning models rely on clean, well-structured data. This course teaches you how to:

• Load and inspect datasets

• Handle missing values

• Encode categorical variables

• Normalize and scale features

You’ll also learn how to use exploratory data analysis (EDA) to understand your data before modeling — a crucial step for success.

---

3. Supervised Machine Learning Models

Once your data is ready, you’ll learn how to build and evaluate machine learning models. Key techniques include:

• Regression models for predicting continuous outcomes

• Classification models for predicting categories

• Decision Trees and Random Forests

• Support Vector Machines (SVM)

Each algorithm is explained in an intuitive way, and you’ll see how to train and test models using real examples.

---

4. Model Evaluation and Tuning

A model isn’t useful unless it performs well. You’ll learn how to:

• Split data into training and test sets

• Measure model performance using metrics like accuracy, precision, and recall

• Use cross-validation to avoid overfitting

• Tune model parameters for better results

These skills are vital for building reliable machine learning systems.

---

5. Real Projects and Practical Applications

Theory is reinforced with real, hands-on projects. You’ll work on:

• Prediction problems using real world datasets

• Building models from start to finish

• Applying what you’ve learned to meaningful tasks

These projects not only reinforce learning — they also give you portfolio pieces you can showcase to employers.

---

Tools You’ll Use

Throughout the course, you’ll work with tools and libraries that are industry standards, including:

• Python — the core programming language

• Pandas and NumPy — for data manipulation

• scikit-learn — for machine learning modeling

• Matplotlib/Seaborn — for visuals and insights

By mastering these tools, you’ll be prepared for real data science and machine learning workflows.

---

Skills You’ll Gain

By completing this course, you’ll be able to:

• Clean and prepare data for modeling

• Build and interpret regression and classification models

• Evaluate model performance confidently

• Use Python to solve practical machine learning problems

• Apply fundamental techniques to new datasets and real challenges

These are core skills that employers look for in data science and machine learning roles.

---

Who Should Take This Course

This course is ideal for:

• Beginners with little to no prior experience in programming or ML

• Students and career changers exploring data science

• Professionals who want practical knowledge of machine learning workflows

• Anyone who wants a structured, beginner-friendly introduction to ML with Python

No advanced math or statistics background is required — the course builds your skills step by step with plenty of guidance.

---

Join Now: Machine Learning with Python : COMPLETE COURSE FOR BEGINNERS

Conclusion

Machine Learning with Python: COMPLETE COURSE FOR BEGINNERS is a practical and accessible guide into the world of machine learning. Rather than overwhelming you with abstract theory or heavy mathematics, it walks you through the essential concepts and skills you need to start building real models.

From Python basics to supervised learning models and hands-on projects, this course lays a strong foundation for your machine learning journey. If you’re ready to move from curiosity to capability — and start solving real data problems with intelligent systems — this course gives you the tools, guidance, and confidence to get there.

Whether you want to launch a career in data science, enhance your professional skillset, or simply understand how machine learning works in practice, this course makes your first step both meaningful and rewarding.

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Convolutional Neural Networks in Python: CNN Computer Vision

 

In recent years, computer vision has transformed from a niche research field into one of the most impactful applications of machine learning. From facial recognition and self-driving cars to medical imaging and augmented reality, the ability of machines to see and interpret visual data is revolutionizing how we interact with technology.

At the heart of these advances are Convolutional Neural Networks (CNNs) — a class of deep learning models uniquely designed to process images and spatial data. The Convolutional Neural Networks in Python: CNN Computer Vision course offers a hands-on journey into this exciting world, teaching you how to build, train, and deploy powerful vision models using Python and popular deep learning frameworks like Keras and TensorFlow.

Whether you’re a beginner in machine learning or an experienced developer expanding your AI skills, this course provides a practical roadmap for mastering CNNs and applying them to real image-based tasks.

---

Why CNNs Are the Foundation of Computer Vision

Traditional machine learning algorithms struggle with image data because they don’t account for spatial relationships — the way pixels relate to each other in space. CNNs overcome this limitation by using convolutional layers that:

• Detect local patterns like edges and textures

• Learn hierarchical features from raw pixels

• Reduce dimensionality without losing important visual information

This allows CNNs to excel at classification, object detection, segmentation, and many other vision tasks.

---

What You’ll Learn in the Course

1. Python and Deep Learning Fundamentals

Before tackling CNNs, you’ll build a solid foundation:

• Python programming essentials

• The basics of neural networks

• Introduction to deep learning frameworks (Keras and TensorFlow)

This ensures that you’re comfortable both with the language and the tools needed to develop vision models.

---

2. The Architecture of Convolutional Neural Networks

The course breaks down CNNs into understandable components, including:

• Convolutional layers — how filters detect visual patterns

• Pooling layers — how spatial information is compressed

• Activation functions — introducing non-linearity

• Fully connected layers — interpreting high-level features

You’ll learn not just what these layers do, but why they matter and how they fit together to form a powerful model.

---

3. Building Image Classification Models

One of the first real tasks you’ll tackle is image classification — teaching a network to recognize and label objects. You’ll:

• Load and preprocess image datasets

• Build CNN architectures from scratch

• Train models on labeled images

• Evaluate performance using accuracy and confusion matrices

Seeing a model correctly identify animals, objects, or scenes is one of the most satisfying milestones in computer vision.

---

4. Data Augmentation and Regularization Techniques

Real-world image datasets are often limited in size. To make your models generalize better, you’ll learn:

• Data augmentation to artificially enhance datasets

• Dropout and other regularization techniques to prevent overfitting

• Transfer learning to leverage pre-trained models

These techniques help models perform reliably even with limited training data.

---

5. Advanced Vision Concepts and Projects

Beyond basic image classification, the course explores:

• Building models for multi-class problems

• Using pre-trained architectures like VGG, ResNet, and Inception

• Fine-tuning models for custom applications

These advanced skills prepare you for more complex real-world challenges.

---

Tools You’ll Use

• Python — the primary programming language

• TensorFlow — the deep learning engine

• Keras — a high-level API for building neural networks

• NumPy, Matplotlib — for data handling and visualization

Together, these tools give you a professional-grade environment for deep learning development.

---

Skills You’ll Gain

By the end of the course, you’ll be able to:

• Understand the inner workings of CNNs

• Build and train your own vision models

• Preprocess and augment image data effectively

• Apply transfer learning to real datasets

• Evaluate model performance and refinement techniques

• Deploy models in practical scenarios

These skills make you job-ready for roles in deep learning, computer vision, AI engineering, and beyond.

---

Who Should Take This Course

This course is ideal for:

• Machine learning enthusiasts who want to specialize in vision

• Developers and engineers transitioning into AI work

• Students and researchers exploring deep learning applications

• Data professionals looking to expand into image-based projects

No prior deep learning experience is required, but some familiarity with Python will help you follow along more easily.

---

Join Now: Convolutional Neural Networks in Python: CNN Computer Vision

Conclusion

The Convolutional Neural Networks in Python: CNN Computer Vision course is a powerful and practical guide for anyone looking to enter the exciting field of computer vision. Instead of overwhelming you with theory alone, it walks you through building real models, understanding their inner mechanics, and applying them to real-world problems.

Whether you’re classifying images, building intelligent vision systems, or exploring deep learning at a deeper level, this course will give you the confidence and experience to build vision-powered AI systems that work.

In an age where machines are increasingly capable of seeing and understanding the world, mastering CNNs is one of the most valuable skills you can learn — and this course sets you on that path with clarity, depth, and real results.

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Data Science & AI Masters 2026 - From Python To Gen AI

 

In a world increasingly driven by data and intelligent systems, professionals with skills in data science and artificial intelligence (AI) are in high demand. But mastering this domain isn’t just about learning a tool here or a model there — it’s about developing a wide spectrum of competencies: programming, data analysis, machine learning, deep learning, and the latest advances in generative AI.

The Data Science & AI Masters 2026 – From Python to Gen AI course on Udemy is crafted to deliver exactly that — a comprehensive, structured, and hands-on journey from the very basics of Python programming to building real AI-driven applications using cutting-edge generative models. Whether you’re a beginner starting your data journey or a professional upskilling for tomorrow’s technology landscape, this course offers a roadmap to success.

---

Why This Course Matters

Traditional learning paths often focus on isolated skills: Python programming in one place, machine learning in another, and generative AI somewhere else entirely. This course breaks that mold by unifying these topics into a coherent learning experience that mirrors real-world workflows. Instead of jumping between unconnected tutorials, learners progress step by step — building stronger understanding, confidence, and practical capability.

In the 2026 tech ecosystem, employers value versatile practitioners who can handle data end-to-end, design predictive models, and leverage generative AI for automation, creativity, and problem solving. This course equips you with exactly those skills.

---

What You’ll Learn

1. Python — The Foundation of Data Science

The course starts with Python, the lingua franca of data science:

• Python basics and syntax

• Data structures

• Functions and code modularity

• Working with files and libraries

Python is the backbone of this entire journey — powering data manipulation, modeling, automation, and AI integration.

---

2. Data Handling and Visualization

Once you’ve mastered Python, the next step is learning how to work with data — the raw material of data science:

• Importing and inspecting datasets

• Cleaning and transforming data

• Exploring features with descriptive statistics

• Visualizing trends using graphs and charts

Visualization isn’t just aesthetic — it’s essential for understanding patterns, spotting anomalies, and communicating insights clearly.

---

3. Machine Learning Mastery

Machine learning lies at the heart of predictive analytics and AI:

• Supervised learning (regression and classification)

• Unsupervised learning (clustering and dimensionality reduction)

• Model evaluation and tuning

• Handling real datasets and cross-validation

Without these skills, you can’t build systems that learn from data — which is essential for forecasting, anomaly detection, recommendation engines, and more.

---

4. Deep Learning Fundamentals

Moving beyond traditional models, the course explores neural networks and deep learning:

• Neural network architecture

• TensorFlow or PyTorch essentials

• Image and text-based deep learning workflows

• Real-world projects like image classification and sequence modeling

Deep learning powers complex perception tasks — like recognizing objects in images or understanding text — and this section gives you hands-on experience building and training these systems.

---

5. Generative AI — The Frontier of Creativity

The final sections of the course focus on generative AI — models that can create content, not just analyze it:

• Large language models (LLMs)

• Text generation and summarization

• AI-driven content workflows

• Practical apps like chatbots and creative assistants

Generative AI is reshaping how we interact with machines, produce content, and automate sophisticated tasks. This course brings you into that cutting edge.

---

Skills You’ll Gain

By completing the course, you’ll be able to:

• Program confidently in Python

• Prepare, explore, and visualize real data

• Build and evaluate machine learning models

• Implement deep learning architectures

• Create applications using generative AI

• Understand the end-to-end process of data science projects

These skills are in high demand across industries — from tech and finance to healthcare and marketing.

---

Hands-On Learning Experience

A major strength of this course is its practical focus. Instead of only learning theory, you’ll work with:

• Hands-on coding exercises

• Real datasets

• Project assignments

• Practical workflows from data ingestion to AI deployment

This approach mirrors the way data science is done in real jobs — giving you experience that goes beyond rote learning.

---

Who Should Take This Course

This course is ideal for:

• Beginners who want a complete introduction from scratch

• Career changers aiming to enter high-growth technology fields

• Developers and analysts who want to upskill in AI and data science

• Professionals exploring generative AI and modern intelligent systems

• Anyone seeking an integrated, end-to-end learning experience

Whether you’re a student preparing for a data career or a working professional expanding your toolkit, this course makes advanced topics accessible and actionable.

---

Join Now: Data Science & AI Masters 2026 - From Python To Gen AI

Conclusion

Data Science & AI Masters 2026 – From Python to Gen AI stands out as a complete and practical pathway for anyone serious about mastering data science and AI. It guides you from the essentials — programming and data handling — all the way to generative AI applications that are shaping the future of intelligent systems.

In a world where data fuels decisions and AI powers innovation, this course equips you with the knowledge and confidence to contribute meaningfully — whether in your current role or your next big career move.

By the time you finish, you won’t just know data science — you’ll do data science, building solutions that turn data into insight and intelligence into action.

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Learn Agentic AI – Build Multi-Agent Automation Workflows

 

Artificial intelligence is rapidly moving past single-purpose tools toward systems that think, act, and coordinate autonomously. At the forefront of this shift is agentic AI — a class of systems where multiple AI agents work together to tackle complex tasks, make decisions, and automate entire workflows without constant human intervention.

The Learn Agentic AI – Build Multi-Agent Automation Workflows course offers a hands-on journey into this exciting landscape. Whether you’re a developer, AI enthusiast, product manager, or tech professional, this course shows how to design, build, and orchestrate multi-agent systems that solve real problems — from automating business processes to scaling sophisticated workflows.

---

Why Agentic AI Matters

Traditional AI models excel at individual tasks: summarizing text, classifying images, generating suggestions. But real world problems often require multi-step reasoning, collaboration, and dynamic planning — such as managing customer requests, conducting research, or coordinating multi-system automation.

Agentic AI brings these capabilities to life by empowering multiple specialized AI agents to:

• communicate and cooperate with each other

• divide work intelligently

• make decisions based on context

• adapt to new information without hard-coded rules

This represents a major leap forward in how automation works — from task automation to intelligent workflow orchestration.

---

What the Course Covers

1. Fundamentals of Agentic AI

Before building complex systems, the course explains what makes AI “agentic”. You’ll learn:

• What agents are and how they differ from typical AI models

• How agentic systems think, plan, and execute tasks

• The strengths and limitations of multi-agent workflows

This foundational understanding prepares you to design systems that do more than repeat instructions — they interpret and respond to evolving needs.

---

2. Designing Intelligent Agents

The course guides you through the process of creating AI agents with specific roles and capabilities:

• Task-oriented agents (e.g., data extraction, reasoning, summarization)

• Specialized agents (e.g., planner agent, researcher agent, executor agent)

• How to define objectives and constraints for each agent

This helps you build modular systems where each agent has a clear purpose yet collaborates as part of a larger workflow.

---

3. Multi-Agent Collaboration and Coordination

Once individual agents are defined, the next challenge is getting them to work together. You’ll learn:

• Communication protocols between agents

• Task delegation and load balancing

• Conflict resolution and fallback strategies

• Workflow orchestration patterns

This focus on cooperation — not just individual performance — is what makes agentic systems powerful in real workflows.

---

4. Implementing and Testing Workflows

Theory becomes practical as you build real multi-agent workflows using tools and frameworks such as:

• Autogen and similar agentic development libraries

• API integrations for task execution

• Practical coding and deployment techniques

You’ll practice debugging, refining, and optimizing workflows that can run end-to-end with minimal human supervision.

---

5. Use Cases and Real-World Applications

The course introduces scenarios where multi-agent automation shines, such as:

• Automated customer support systems

• Research assistants that gather and summarize data

• Business process automation (e.g., lead qualification, reporting)

• Data pipeline coordination and monitoring systems

These examples help you see how agentic AI can deliver value across sectors.

---

Skills You’ll Gain

By completing this course, you’ll be able to:

• Understand the concept and benefits of agentic AI

• Design and implement specialized AI agents

• Build multi-agent workflows that divide and conquer tasks

• Coordinate agents to work collaboratively toward goals

• Deploy and test agentic systems in real-world contexts

These skills prepare you not just for building individual AI models, but for constructing intelligent ecosystems that can automate complex processes with minimal oversight.

---

Who Should Take This Course

This course is well-suited for:

• Developers and software engineers wanting to build next-generation AI systems

• AI practitioners expanding beyond single-agent models

• Product managers and tech leads envisioning intelligent workflows for automation

• Data scientists exploring AI orchestration and automation

• Anyone curious about how AI systems can act instead of just predict

You don’t need to be an expert in deep learning, but familiarity with Python, APIs, and basic AI concepts will help you get the most out of the content.

---

Join Now: Learn Agentic AI – Build Multi-Agent Automation Workflows

Conclusion

The Learn Agentic AI – Build Multi-Agent Automation Workflows course offers a practical and forward-looking pathway into the world of intelligent automation. Instead of focusing on isolated models that solve isolated tasks, this program teaches you how to architect AI systems that think, coordinate, and act together.

In a world where complexity is the rule, not the exception, agentic AI represents the next evolution of automation — one where collaborative agents can handle multi-step processes, adapt to new information, and deliver meaningful outcomes with less human intervention.

If you’re ready to go beyond traditional AI applications and start building the workflows of the future, this course gives you the tools, methods, and real coding experience to make it happen. From intelligent task delegation to coordinated agent behavior, you’ll walk away with a deeper understanding of how multi-agent systems can transform the way work gets done.

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Python Coding Challenge - Question with Answer (ID -270126)

 

1️⃣ async def foo()

async def foo(): 
     return 5

• This defines an asynchronous function.

• Calling foo() does NOT execute it immediately.

• It returns a coroutine object.

---

2️⃣ asyncio.run(foo())

asyncio.run(foo())

• asyncio.run():

  • Creates an event loop

  • Executes the coroutine foo()

  • Waits until it finishes

  • Returns the final result

✅ Since foo() returns 5, this line evaluates to:

5

---

3️⃣ + 1

asyncio.run(foo()) + 1

• Now it becomes:

5 + 1

• Result:

6

---

4️⃣ print(...)

print(6)

---

✅ Final Output

6

---

⚠️ Important Trick

If you wrote this instead:

print(foo() + 1)

❌ It would raise an error because:

• foo() returns a coroutine, not an integer

---

💡 Key Takeaway

• async def → returns a coroutine

• asyncio.run() → executes it and returns the result

• You can only use the returned value after awaiting/running

900 Days Python Coding Challenges with Explanation

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Day 40:Overusing inheritance instead of composition

 

🐍 Python Mistakes Everyone Makes ❌

Day 40: Overusing Inheritance Instead of Composition

Inheritance is one of the first OOP concepts most Python developers learn.
And that’s exactly why it’s often overused.

Just because you can inherit from a class doesn’t mean you should.

---

❌ The Mistake

Using inheritance when the relationship is not truly “is-a”.

class Engine:
    def start(self):
        print("Engine started")

class Car(Engine): # ❌ Car is NOT an Engine
    def drive(self):

     print("Car is driving")

This design implies:

A Car is an Engine

Which is logically incorrect.

---

❌ Why This Fails

• ❌ Creates tight coupling

• ❌ Makes the code harder to change later

• ❌ Breaks real-world modeling

• ❌ Leads to fragile inheritance hierarchies

• ❌ Prevents reusing components independently

If Engine changes, Car breaks.

---

✅ The Correct Way: Composition

Use composition when an object has another object.

class Engine:
     def start(self):
         print("Engine started")

class Car:
    def __init__(self):
       self.engine = Engine() # ✅ Composition

 def drive(self):
    self.engine.start() 

      print("Car is driving")


Now:

A Car has an Engine

This is flexible, realistic, and scalable.

---

🧠 Why Composition Wins

• Components can be swapped or upgraded

• Code becomes modular

• Easier testing and reuse

• Fewer breaking changes

• Cleaner mental model

Want an electric engine? Just replace it.

---

🧠 Simple Rule to Remember

🧩 Use inheritance for “is-a” relationships
🔗 Use composition for “has-a” relationships

If it feels awkward to say out loud — it’s probably wrong in code too.

---

🚀 Final Takeaway

Inheritance is powerful — but dangerous when misused.

Most real-world systems are built from parts, not types.
Favor composition first, and reach for inheritance only when the relationship is truly structural.

Good design is about flexibility, not clever hierarchies.

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Day 38: Blocking I/O in async programs

 

🐍 Python Mistakes Everyone Makes ❌

Day 38: Blocking I/O in Async Programs

Async programming in Python is powerful—but only if you follow the rules.
One of the most common mistakes is using blocking I/O inside async code, which silently kills performance.

---

❌ The Mistake

Using a blocking function like time.sleep() inside an async function.

import time
import asyncio 

async def task():
   time.sleep(2) # ❌ blocks the event loop
   print("Done")

asyncio.run(task())

At first glance, this looks fine.
But under the hood, it breaks how async works.

---

❌ Why This Fails

• time.sleep() blocks the event loop

• While sleeping, no other async tasks can run

• Async code becomes slow and sequential

• No error is raised — just poor performance

This makes the bug easy to miss and hard to debug.

---

🚨 What’s Really Happening

Async programs rely on an event loop to switch between tasks efficiently.
Blocking calls stop the event loop entirely.

Result:

• No concurrency

• Wasted async benefits

• Performance similar to synchronous code

---

✅ The Correct Way

Use non-blocking async alternatives like asyncio.sleep().

import asyncio

async def task():
    await asyncio.sleep(2)
    print("Done")

asyncio.run(task())

Why this works:

• await pauses only the current task

• The event loop stays responsive

• Other async tasks can run in the meantime

---

🧠 Common Blocking Functions to Avoid in Async Code

time.sleep()

• Blocking file I/O

• Blocking network calls

• CPU-heavy computations

Use:

asyncio.sleep()

• Async libraries (aiohttp, aiofiles)

• Executors for CPU-heavy work

---

🧠 Simple Rule to Remember

🐍 Blocking calls freeze the event loop
🐍 Use await, not blocking functions
🐍 Never block the event loop in async code

---

🚀 Final Takeaway

Async code only works when everything cooperates.
One blocking call can ruin your entire async design.

Write async code the async way —
Fast, non-blocking, and scalable.

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Happy Republic Day India

 

🇮🇳 Happy Republic Day Using Python: Visualizing Patriotism with Code

Republic Day is not just a national celebration—it’s a reminder of India’s constitution, unity, and democratic values.
As programmers, we often express creativity through code. So why not celebrate 26 January using Python?

In this blog, we’ll see how Python + Matplotlib can be used to create a beautiful Republic Day banner featuring:

• Tricolor waves 🇮🇳

• Ashoka Chakra 🔵

• Clean, minimal design

• Fully generated using code

No design tools. No images. Just pure Python.

---

🎯 Why Celebrate Republic Day with Python?

Programming is not limited to data, algorithms, or automation.
It’s also a creative medium.

By combining mathematics and visualization, Python allows us to:

• Create meaningful art

• Learn plotting fundamentals

• Share patriotic content on social media

• Teach students real-world use of libraries like Matplotlib & NumPy

This makes it perfect for educational posts, reels, banners, and coding challenges.

---

🧠 Concepts Used in This Project

Before jumping into the code, let’s understand what’s happening behind the scenes:

• NumPy
  Used to generate smooth sine and cosine waves.

• Matplotlib
  Used for plotting curves, shapes, and text.

• Mathematics

  • Sine waves → Tricolor ribbon

  • Circle + radial lines → Ashoka Chakra (24 spokes)

This project is beginner-friendly but looks impressive.

---

🧑‍💻 Python Code: Republic Day Banner

Below is the complete Python code that generates the Republic Day design:

import numpy as np
import matplotlib.pyplot as plt

fig, ax = plt.subplots(figsize=(10, 3))
ax.axis("off")
ax.set(xlim=(0, 10), ylim=(-1, 1))

x = np.linspace(0, 10, 300)

# Tricolor waves
ax.plot(x, .15*np.sin(x)-.6, lw=10, c="#FF9933")  # Saffron
ax.plot(x, .15*np.sin(x)-.8, lw=10, c="#138808")  # Green

# Ashoka Chakra
t = np.linspace(0, 2*np.pi, 150)
ax.plot(1.4 + .25*np.cos(t), .25*np.sin(t), c="#0038A8", lw=2)

for a in np.linspace(0, 2*np.pi, 24):
    ax.plot(
        [1.4, 1.4 + .25*np.cos(a)],
        [0, .25*np.sin(a)],
        c="#0038A8", lw=1
    )

# Text
ax.text(3.2, 0, "REPUBLIC DAY", fontsize=30,
        weight="bold", va="center")
ax.text(3.2, -0.4, "26 January",
        fontsize=14, c="#0038A8", va="center")

plt.show()

---

🎨 What This Code Creates

✔ Flowing saffron & green waves
✔ Perfect Ashoka Chakra with 24 spokes
✔ Clean typography
✔ Banner-style output (great for Instagram & LinkedIn)

You can easily:

• Change colors

• Animate the waves

• Resize for reels or posts

• Add your brand watermark (like CLCODING)

---

🚀 Ideas to Extend This Project

If you want to level this up, try:

• 🎥 Animating the waves using FuncAnimation

• 📱 Exporting as Instagram square (1:1)

• 🧑‍🏫 Teaching sine waves visually to students

• 🏁 Creating similar designs for Independence Day

• 🖼️ Saving output as PNG for social media

---

🇮🇳 Final Thoughts

Republic Day reminds us that freedom and responsibility go together.
As developers, using code creatively is one way to honor that freedom.

Python isn’t just for backend or data science—it’s also a canvas for creativity.

Happy Coding 🇮🇳
Happy Republic Day 🇮🇳

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Day 39: Ignoring GIL Assumptions

🐍 Python Mistakes Everyone Makes ❌

Day 39: Ignoring GIL Assumptions

Python makes multithreading look easy — but under the hood, there’s a critical detail many developers overlook: the Global Interpreter Lock (GIL).

Ignoring it can lead to slower programs instead of faster ones.

---

❌ The Mistake

Using threads to speed up CPU-bound work.

import threading

def work():
    total = 0
    for i in range(10_000_000):
         total += i

threads = [threading.Thread(target=work) for _ in range(4)]

for t in threads: 

   t.start()
for t in threads: 

  t.join()

This looks parallel — but it isn’t.

---

❌ Why This Fails

• Python has a Global Interpreter Lock (GIL)

• Only one thread executes Python bytecode at a time

• CPU-bound tasks do not run in parallel

• Threads add context-switching overhead

• Performance can be worse than single-threaded code

---

🧠 What the GIL Really Means

• Threads are great for I/O-bound tasks

• Threads are bad for CPU-bound tasks

• Multiple CPU cores ≠ parallel Python threads

The GIL protects memory safety, but limits CPU parallelism.

---

✅ The Correct Way

Use multiprocessing for CPU-bound work.

from multiprocessing import Pool

def work(n):
    total = 0
   for i in range(n):
         total += i
 return total

if __name__ == "__main__":
    with Pool(4) as p: 

       p.map(work, [10_000_000] * 4)

Why this works:

• Each process has its own Python interpreter

• No shared GIL

• True parallel execution across CPU cores

---

🧠 When to Use What

Task Type	Best Choice
I/O-bound (network, files)	threading, asyncio
CPU-bound (math, loops)	multiprocessing
Mixed workloads	Combine wisely

---

🧠 Simple Rule to Remember

🐍 Threads ≠ CPU parallelism in Python
🐍 GIL blocks parallel bytecode execution
🐍 Use multiprocessing for CPU-heavy tasks

---

🚀 Final Takeaway

Threads won’t make CPU-heavy Python code faster.
Understanding the GIL helps you choose the right concurrency model — and avoid hidden performance traps.

Know the limits. Write smarter Python. 🐍⚡

 

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Python Coding Challenge - Question with Answer (ID -230126)

 

Explanation:

Line 1: Global Variable Initialization

x = 1

A global variable x is created.

Current value of x → 1

Line 2–5: Function Definition

def f():

    global x

    x += 2

def f():

Defines a function named f.

global x

Tells Python that x inside this function refers to the global variable, not a local one.

x += 2

Updates the global x.

When f() runs:

x becomes 1 + 2 = 3

Important:

The function does NOT return anything, so by default it returns:

None

Line 6: Function Call Inside Expression (TRICKY)

x = x + f()

Step-by-step execution order:

f() is called first

Inside f():

x becomes 3

returns None

Expression becomes:

x = 1 + None

Line 6 Result: ERROR

TypeError: unsupported operand type(s) for +: 'int' and 'NoneType'

Why?

You cannot add:

an int (1)

with None

f() returned None, not a number

Line 7: Print Statement

print(x)

This line never runs, because the program crashes on the previous line.

Final Outcome

Output:

TypeError

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Python Coding challenge - Day 986| What is the output of the following Python Code?

 

Code Explanation:

1. Defining a Custom Metaclass

class Meta(type):

Meta is a metaclass because it inherits from type.

Metaclasses control class-level behavior, including how isinstance() works.

2. Overriding __instancecheck__

    def __instancecheck__(cls, obj):

        return obj == 5

__instancecheck__ is called whenever isinstance(obj, Class) is executed.

Instead of normal type checking, it compares the object value.

It returns:

True if obj is equal to 5

False otherwise

3. Defining Class A Using the Metaclass

class A(metaclass=Meta): pass

Class A is created using the metaclass Meta.

Any isinstance(..., A) check will now use Meta.__instancecheck__.

4. Evaluating isinstance(5, A)

isinstance(5, A)

Step-by-step:

Python sees A has a custom metaclass.

Calls:

Meta.__instancecheck__(A, 5)

obj == 5 → True

5. Evaluating isinstance(3, A)

isinstance(3, A)

Step-by-step:

Calls:

Meta.__instancecheck__(A, 3)

obj == 5 → False

6. Printing the Results

print(isinstance(5, A), isinstance(3, A))

Prints the results of both checks.

7. Final Output

True False

✅ Final Answer

✔ Output:

True False

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Python Coding challenge - Day 985| What is the output of the following Python Code?

 

Code Explanation:

1. Defining Class A

class A:

    def f(self): return "A"

Class A defines a method f.

f() returns the string "A".

2. Defining Class B

class B:

    def f(self): return "B"

Class B also defines a method f.

f() returns the string "B".

3. Defining Class C Inheriting from A

class C(A): pass

Class C inherits from A.

At this point, the inheritance chain is:

C → A → object

4. Creating an Object of C

obj = C()

An instance obj of class C is created.

At this moment:

obj.f() → "A"

5. Changing the Base Class at Runtime

C.__bases__ = (B,)

This line modifies the inheritance of class C at runtime.

Now, C no longer inherits from A, but from B.

The new inheritance chain becomes:

C → B → object

Important:

This change affects all instances of C, including ones already created.

6. Calling f() After Base Change

print(obj.f())

Step-by-step method lookup:

Python looks for f in class C → not found.

Python looks in B (new base class) → found.

B.f() is called.

7. Final Output

B

Final Answer

✔ Output:

B

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Python Coding challenge - Day 984| What is the output of the following Python Code?

 

Code Explanation:

1. Defining the Class

class A:

A class named A is defined.

2. Defining Method f

    def f(self):

        A.f = lambda self: "X"

        return "A"

This method does two things:

Reassigns the class method A.f

It replaces A.f with a new lambda function:

lambda self: "X"

Returns "A" for the current call.

Important:

This reassignment happens during the execution of the method.

3. Creating an Instance

a = A()

An object a of class A is created.

At this point:

A.f → original method (returns "A")

4. First Call: a.f()

a.f()

Step-by-step:

Python finds method f on class A.

Executes the original method.

Inside the method:

A.f is replaced with the lambda returning "X".

The method returns "A".

Result of first call:

"A"

5. Second Call: a.f()

a.f()

Step-by-step:

Python again looks for f on class A.

Now A.f is the new lambda function.

The lambda runs and returns "X".

Result of second call:

"X"

6. Printing Both Results

print(a.f(), a.f())

First a.f() → "A"

Second a.f() → "X"

7. Final Output

A X

Final Answer

✔ Output:

A X

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Python Coding challenge - Day 983| What is the output of the following Python Code?

 

Code Explanation:

1. Defining a Custom Metaclass

class Meta(type):

Meta is a metaclass because it inherits from type.

A metaclass controls how classes are created.

2. Overriding __new__ in the Metaclass

def __new__(cls, name, bases, dct):

    return super().__new__(cls, name, (), dct)

__new__ is executed every time a class using this metaclass is created.

Instead of using the original bases, it forces bases to be empty ().

Python rule:

If no base class is provided, Python automatically inserts object.

3. Creating Class A

class A(metaclass=Meta): pass

What happens internally:

Meta.__new__ is called.

bases is replaced with ().

Python automatically inserts object.

Result:

A.__bases__ == (object,)

4. Creating Class B

class B(A): pass

Very important behavior:

B inherits the metaclass from its parent A.

So Meta.__new__ is also called for B.

Internally:

Meta.__new__(Meta, "B", (A,), {...})

The metaclass again replaces bases with ()

Python inserts object

Result:

B.__bases__ == (object,)

5. Printing the Base Classes

print(B.__bases__)

Prints the direct parent class(es) of B.

6. Final Output

(<class 'object'>,)

Final Answer

✔ Output:

(object,)

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