what is python ?Basic python codes that helps you to understand python

 

What is Python?

Python is a high-level, interpreted, object-oriented programming language known for its simplicity, readability, and versatility. It was created by Guido van Rossum and is widely used in various domains like web development, data science, artificial intelligence (AI), automation, and software development.

Python's syntax is clean and easy to learn, making it a great choice for beginners while still being powerful enough for advanced applications.

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Importance of Python in Today’s Web & App Development

Python plays a crucial role in modern web and app development due to its scalability, flexibility, and vast ecosystem of frameworks and libraries. Here’s why it is widely used:

1. Web Development 🌐

Python provides powerful frameworks for building websites and web applications efficiently:
✅ Django – A high-level framework for building secure, scalable web applications.
✅ Flask – A lightweight framework for small, flexible applications.
✅ FastAPI – An optimized framework for modern web APIs.

🔹 Python simplifies backend development, database management, and API integration.

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2. Mobile App Development 📱

Although Python is not the primary choice for mobile apps, it can be used with frameworks like:
✅ Kivy – For cross-platform mobile applications (Android & iOS).
✅ BeeWare – Allows developers to write Python apps that run on multiple platforms.
✅ PyQt – For building GUI-based applications.

🔹 Python-based mobile development is useful for prototyping, AI-powered apps, and automation tools.

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3. Artificial Intelligence (AI) & Machine Learning (ML) 🤖

Python dominates AI/ML development with libraries such as:
✅ TensorFlow & PyTorch – For deep learning and AI applications.
✅ scikit-learn – For machine learning models.
✅ Pandas & NumPy – For data manipulation and numerical computations.

🔹 AI-powered apps like chatbots, recommendation systems, and automation tools are often built using Python.

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4. Backend Development & API Integration 🔗

Python simplifies backend development with fast, scalable API solutions, such as:
✅ Django REST Framework (DRF) – For building RESTful APIs.
✅ FastAPI – For high-performance API development.
✅ GraphQL with Python – For modern API architecture.

🔹 Python helps connect databases, cloud services, and mobile/web apps seamlessly.

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5. Automation & Scripting 🔄

Python is widely used for automating repetitive tasks, such as:
✅ Web scraping (BeautifulSoup, Scrapy)
✅ File handling & batch processing
✅ System automation & DevOps (Ansible, Fabric)

🔹 Many business and development processes are automated using Python scripts.

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6. Game Development 🎮

Python supports game development with:
✅ Pygame – For 2D game development.
✅ Panda3D – For 3D game projects.

🔹 Though not as common as Unity (C#) or Unreal Engine (C++), Python is used for game logic, AI bots, and game automation.

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7. Internet of Things (IoT) & Embedded Systems 🔌

Python is used in IoT projects with:
✅ Raspberry Pi – For hardware programming.
✅ MicroPython – For lightweight devices.

🔹 Python enables smart home applications, robotics, and industrial IoT solutions.

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Conclusion: Why Use Python?

✔ Easy to Learn & Use – Beginner-friendly with simple syntax.
✔ Huge Ecosystem – Rich libraries and frameworks for diverse applications.
✔ Scalability & Performance – Used by tech giants like Google, Facebook, and Netflix.
✔ Cross-Platform – Works on Windows, macOS, Linux, and even mobile.
✔ Strong Community Support – Active developers and open-source contributions.

Python is a game-changer in modern software development, from web & mobile apps to AI-driven

problem:write python code to take 2 inputs and do addition,substracrion,multiplication,divition

code:

# Taking input from the user num1 = float(input("Enter first number: ")) num2 = float(input("Enter second number: ")) # Performing arithmetic operations addition = num1 + num2 subtraction = num1 - num2 multiplication = num1 * num2 # Handling division to prevent division by zero error if num2 != 0: division = num1 / num2 else: division = "Undefined (cannot divide by zero)" # Displaying results print("\nResults:") print(f"Addition: {addition}") print(f"Subtraction: {subtraction}") print(f"Multiplication: {multiplication}") print(f"Division: {division}")

Example Output:

Enter first number: 10
Enter second number: 5

Results:
Addition: 15.0
Subtraction: 5.0
Multiplication: 50.0
Division: 2.0

problem:python program that takes the user's marks as input and assigns a grade based on a standard grading system

code:

# Function to determine grade based on marks def calculate_grade(marks): if marks >= 90: return 'A' elif marks >= 80: return 'B' elif marks >= 70: return 'C' elif marks >= 60: return 'D' elif marks >= 50: return 'E' else: return 'F' # Fail # Taking user input with validation while True: try: marks = float(input("Enter your marks (0-100): ")) if 0 <= marks <= 100: break else: print("Invalid input! Marks should be between 0 and 100.") except ValueError: print("Invalid input! Please enter a numeric value.") # Determine grade grade = calculate_grade(marks) # Display result print(f"Your grade is: {grade}")

How It Works:

✅ Takes user input for marks between 0 and 100.
✅ Uses a while loop to ensure valid input.
✅ Uses an if-elif-else statement to assign a grade:

• 90-100 → A
• 80-89 → B
• 70-79 → C
• 60-69 → D
• 50-59 → E
• Below 50 → F (Fail)
  ✅ Handles invalid inputs (e.g., negative numbers, non-numeric values).
  ✅ Displays the final grade.

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Example Output:

Enter your marks (0-100): 85
Your grade is: B