Python Data Structures: Lists, Tuples, Sets, Dictionaries

This blog covers everything from creating your first dictionary to advanced patterns like nested dicts, defaultdict, Counter, and dictionary comprehensions — with output tables after every example so you can see exactly what each operation produces. #Python #DataEngineering https://lnkd.in/g23zDgfm

Modern Python tooling like ruff, pytest, mypy, black, py-spy, and pre-commit can help streamline your Python workflow, improve code quality, and catch bugs before deployment. My latest article on the Towards Data Science platform talks about all these tools and covers how to build a cleaner, faster feedback loop so you can spend less time fixing avoidable issues later and more time actually shipping. If you’re working in Python and want a more reliable development setup, this should be useful. Read it here for free: https://lnkd.in/ewuXn6NF

🖥️ Day 1 of python journey What I learned today: Variables and the 4 core data types. Python has four fundamental types that appear in every program ever written: int — whole numbers. Every user ID, every age, every count, every loop index in every application is an integer. float — decimal numbers. Every price, every percentage, every measurement is a float. One important thing I learned: 0.1 + 0.2 in Python equals 0.30000000000000004, not 0.3. This is a floating-point precision issue that causes real bugs in financial applications. Professional developers use Python's Decimal module for money calculations. str — text. Every API response your application receives, every database field it reads, every message it displays is a string. bool — True or False. The entire logic of every program — every condition, every decision, every filter — is powered by boolean values. The insight that changed how I think about Python: input() always returns a string. Always. Even if the user types 100, Python gives you "100" — the text, not the number. If you try to do arithmetic on it without casting, you get a TypeError. The fix: int(input("Enter your age: ")) — convert the string to an integer immediately. This is the very first thing that trips up beginners. I learned it on Day 1. What I built today: A personal profile program that takes 5 inputs — name, age, city, is_employed, salary — stores them in correctly typed variables, and prints a formatted summary using f-strings: f"Name: {name} | Age: {age} | City: {city}" Simple? Yes. But this exact pattern — collect input, store in typed variables, format and display output — appears in every data entry form, every registration page, every dashboard in every Python application. #Day1#Python#PythonBasic#codewithharry#w3schools.com

🔹 Understanding Python Memory One important concept is how Python stores data in memory. When we write: a = 10 Most people think variable a stores the value 10. But in reality, Python variables store references to objects. Here 10 is the object, and a simply points to that object in memory. Multiple variables can reference the same object: a = 10 b = a Both a and b point to the same object in memory. 🔹 Mutable vs Immutable Objects Understanding this difference is very important in backend development. Immutable objects (cannot change after creation) ✴️ int ✴️ float ✴️ bool ✴️ str ✴️ tuple Example: a = 10 a = 20 Python creates a new object instead of modifying the old one. Mutable objects (can change after creation) ✴️ list ✴️ dictionary ✴️ set ✴️ custom classes Example: a = [1, 2] b = a b.append(3) Now a becomes: [1, 2, 3] Because both variables point to the same mutable object. This is a very common source of bugs in backend systems when shared state is not handled properly. 🔹 Generators in Python Generators are extremely useful for handling large data efficiently. A generator produces values one at a time instead of loading everything into memory. Example: def numbers(): for i in range(5): yield i for n in numbers(): print(n) Here, values are generated only when needed. 💡 Why generators are important in backend systems Generators are widely used for: ✴️ Streaming large API responses ✴️ Processing logs ✴️ Reading millions of database rows ✴️ Background workers ✴️ Data pipelines ✴️ Async streaming They help save memory and improve performance, especially when working with large datasets. #Python #BackendEngineering #SoftwareDevelopment

Whether you want to automate repetitive tasks, analyze data, build websites, or dive into machine learning — Python is the perfect starting point. And the best way to start is by getting solid on the fundamentals. In this guide you will learn every basic Python operation through concise explanations, real code examples, and the exact output you can expect to see when you run them. No fluff, no setup headaches — just Python. #Python #DataEngineering https://lnkd.in/g6bvfhHX

Unlock Python's full potential for automating file and data tasks in your homelab. Many scripts get stuck because they can't efficiently read or write files, costing hours in repetitive work. Learning proper file handling not only speeds up workflows but opens doors to more advanced automation.   https://lnkd.in/g5a758Wh   #Python #Automation #DataProcessing #Homelab #TechSkills

Python Files & Data — Reflective Takeaway   Working with Python often exposes hidden errors—sometimes hours after a script runs. Recently, I guided a team through a file-handling bug that could have been prevented with simple upfront validation. The lesson: build checks early and often to save time, frustration, and keep projects on track.   https://lnkd.in/g5a758Wh   #Python #Automation #DataHandling #Workflow #Productivity

Day 50 : Python Type Conversion in Python Today I understood how to convert data types in Python and how it is useful for easy processing. Hands-on : - Today I learned about type conversion in Python, which is essential for transforming data from one type to another based on requirements. - I started by converting strings to integers using functions like int(), which is useful when working with numerical input stored as text. - Next, I explored how to convert between lists, sets, and tuples, allowing flexibility in handling collections. - For example, converting a list to a set helps remove duplicates, while converting to a tuple makes the data immutable. - I also learned about converting dictionaries, such as extracting keys, values, or items into list formats for easier processing. - Additionally, I practiced converting strings to lists, where each character or word can be separated into elements using functions like list() or split(). - These conversions are crucial for data cleaning, transformation, and preparation in real-world projects. Result : - Successfully understood how to convert between different data types in Python to make data more usable and structured. Key Takeaways : - Type conversion helps adapt data for different operations. - int() converts strings into numeric values. - Lists, sets, and tuples can be converted based on use case. - Dictionary data can be extracted into keys, values, or items. - Strings can be converted into lists for easier manipulation. #Python #Programming #DataAnalytics #LearningJourney #TypeConversion #CodingBasics #DataScience #BeginnerPython #AnalyticsSkills