
Python: From Zero to Professional
Welcome to Python From Zero to Professional. This course is designed to take you from no programming experience to building real-world Python applications. And building the foundational skills needed to step into the world of AI.
Your 21 days commitment to learn Python
Give me your 21 days commitment and it is my promise that you will be able to write programs in Python and be ready to fly with your career.
Meet Rahul Anand, a veteran engineering leader, as he introduces the Python zero-to-professional course and explains why Python suits data engineers, data scientists, and AI engineers.
Identify the intended audience for Python: zero to professional, including beginners, learners switching from other languages, and data professionals solidifying fundamentals, with weekly projects.
Verify your Python and uv installations by checking versions, launch the Python interactive shell, perform basic calculations, print hello world, and learn how to exit the shell.
Discover why Python powers AI and ML with beginner-friendly syntax, rapid prototyping, and a massive ecosystem of libraries like PyTorch, TensorFlow, and NumPy.
We completed day one by exploring why Python is important and introducing the course, then installed the ide, uv, and Python, with an optional Jupyter setup.
Explore Google Colab, a browser-based python environment that runs code on Google's infrastructure without local setup. Use markdown and code cells to run Hello world.
Explore Python fundamentals by writing code in Google Colab, learn how variables store values with dynamic typing, and practice declaring and printing age and name, then update values.
Master the basic Python data types, including int, float, str, and bool, and learn how Python's dynamic typing stores values in variables at runtime for beginner-friendly development.
Master Python fundamentals by naming and using variables, through dynamic typing and printing in Google Colab, showing assignment, value changes, and basic syntax.
Experiment with Python data types by declaring variables such as age, name, salary, tax rate, and is student; print their types to confirm int, string, float, and boolean.
Assign values to variables, overwrite them, and see how the last assignment determines the current value, with prints showing Tyson, Alex, and values flowing between variables.
Complete hands-on exercises to test your knowledge by coding along, pausing to write and run code, and print outputs for variables like name, age, city, and is_student.
Review day-2 progress by revisiting GitHub. Consolidate learning of variables, data types, and variable naming through hands-on coding and a final exercise, celebrating your second trophy.
Master Python fundamentals on day 2 by exploring variables, data types, and naming with coding; distinguish interpreters from compilers and learn control flows with if-else and loops to automate tasks.
Learn how Python control flow uses if, elif, and else with proper indentation; explore blocks, colon syntax, and practical examples like age-based decisions and printing multiple statements.
Explore Python control flows with if, elif, and else, learn proper syntax and indentation, and identify common beginner mistakes like using a single equals or missing colons.
Explore Python control flows with illustrated if statements, else and elif, using age-based examples to show evaluation, indentation rules, and common mistakes like single equals and missing colons.
Master control flows by validating string length in Python: determine if a string exceeds 50 characters to classify input as good or bad, with practical, hands-on exercises.
Explore for loops and while loops with illustrations: print each employee from a list, one by one, and prompt for a number, cast to integer, until it equals five.
Learn to print the first 10 natural numbers using a while loop, with proper increment and loop control, and extend to summing 1 to a user-provided number.
Practice conditional statements, comparison operators, and if-else logic with for and while loops in Python, using collab notebooks, user input, and incremental steps to build automation.
We officially close day 3 by cementing control flows, including variables, data types, and conditional statements with loops, then prepare to learn functions and tackle the day 5 real-world project.
Learn to write modular Python code by defining and calling functions, using parameters and return values, and building reusable utility functions with the def keyword.
Explore function definitions with parameters, pass arguments, print results, and return values to create modular, parameter-driven code that handles sums and greetings.
Explore Python function illustrations by implementing utility functions like add, subtract, is even, and convert to upper; learn about arithmetic operators and using a utilities file to verify results.
Define a Python function calculate_simple_interest(P, T, R) to compute P*T*R/100, with example P=1000, T=2, R=0.5.
Recap day four by reviewing python functions, parameters vs arguments, and return values. Apply function best practices, explore side effects, and tackle a simple interest exercise for day five.
Recap day 4: finish learning functions and review days 1–4, covering variables, data types, and control flows, then prep for day 5's age eligibility checker project toward Python professionalism.
Use Python if-else to implement fizz buzz: print fizz for multiples of 3, buzz for 5, fizzbuzz for both, otherwise print the number, with user input.
Learn to execute and debug Python in Visual Studio Code by migrating Colab code, creating age-eligibility.py, using terminal run, extensions, and the Python debugger.
Recap day 5 with the age eligibility checker project completed in Google Colab, migrated to Visual Studio for coding and debugging, and tested in three modes.
Close week 1 by completing the age eligibility checker project and celebrate over 30% course progress. Week 2 introduces data structure, exception handling, and classes and objects through two projects.
Learn how to store and manage data with Python lists and dictionaries, using indexed access, slicing, modification, and key-value retrieval.
Explore list operations in Python, including append, insert at a specific index, remove by value, pop by index, and length, using practical fruit examples.
Learn to iterate through a list with a for loop, printing each item, and compare the range function as an efficient iterable for generating numbers and indexing by length.
Apply data structures—lists and dictionaries—to build a to-do list app, building on week 1 fundamentals of conditionals, loops, and functions; next, explore exception handling for robust code.
Learn how to handle runtime errors in Python using try, except, else, and finally, including multiple exception types and custom exceptions to enable graceful recovery.
Demonstrate Python exception handling by wrapping division code in try/except, catching zero division errors, and printing a graceful invalid input message. Explore specific exceptions and when to let others propagate.
Learn to handle specific exceptions like value error, use else for code that runs when no exception occurs, and finally to run code regardless of errors, with hands-on examples.
Learn how to raise exceptions in Python with the raise keyword, signaling unexpected input like a negative age and guiding library users according to business rules.
Explore Python exception handling through hands-on code: from try-except, else and finally, to with for safe file access, custom exceptions, and reading user-supplied files with clear error messages.
Apply exception handling to a real-world shopping cart checkout, validating inventory, stock, and item presence, while implementing custom exceptions and a complete checkout flow in Python.
Explore exception handling in Python, using try, except, else, and finally; raise and create custom exceptions, and manage multiple exceptions to build safer, crash-free programs.
Advance through Python fundamentals, mastering variables, operators, control flows, and functions; explore lists, dictionaries, and exception handling to build reliable code, with upcoming object oriented programming concepts and real-world projects.
Define a Python class for complex numbers with real and imaginary parts, initialize with __init__, add two numbers to return a new complex, and implement __repr__ for display.
Learn how to model real-world entities in Python by creating a digital vending machine class with inventory and balance, supporting insert money, purchase, and show inventory.
Leverage classes as a blueprint to define structures, instantiate objects, and interact with them, illustrated by a digital vending machine example.
Learn how classes and objects represent real world entities in Python, with a week 2 recap on dictionaries, lists, exception handling, and modular programming, highlighting progress toward upcoming projects.
Learn to implement a Python number guessing game using a class, random number generation between 1 and 100, and interactive command-line input with low/high hints.
Recap of day 4, week 2, featuring a Python number guessing game built with classes and an infinite loop, using random and if-else for number comparisons.
Master Python fundamentals and advanced topics through week 1 concepts like variables and loops, and week 2 data structures and classes, as you complete day 4's weekly number guessing game.
Close out week 2 by completing the student grading system project, building on week 1 fundamentals—from variables and data types to control flows, functions, data structures, classes, and exception handling.
Learn about file handling in python, including opening, reading, writing, and appending, and explore binary mode, encoding, and persistent storage with data files like data.txt.
Open, read, write, and append files in Python, testing output.txt with modes w, a, and x. Use with to auto-close file handles and catch exceptions.
Explore file handling in Python by opening, reading, writing, and appending with safe context managers and error handling, then apply these concepts in a real-world scenario.
Learn file handling by building a simulated login system that stores and validates username and password in a file, demonstrating persistent storage across runs.
Learn how to use SQLite with Python to manage databases, perform CRUD operations, and connect applications to a file-based database while understanding ACID and data integrity.
Use SQLite with Python to create databases, a cursor, and perform create, read, update, and delete operations with commits. Work with company.db and student.db toward an expense tracker project.
Create an expense tracker using a file-based SQLite database. Implement table creation, add and view expenses, and compute total spending and spending by category, using SQL concepts and database handling.
Explore databases by learning to interact with a database using SQL, build an expense tracker, save expenses, view all entries, and calculate the total.
Advance through Python fundamentals and databases, finishing day 2 of week 3 with an official checkmark on databases.
Apply file handling and exception handling to build a log file analyzer that processes web server logs and outputs key metrics.
Recap the day three project with a log file analyzer handling a production web server log to count successful and failed entries and compute metrics for a concise report.
Master file handling and SQLite databases while building the log file analyzer, reinforcing Python fundamentals like variables, data types, operators, control flow, and functions across weeks 1 to 3.
Conclude week 3 by building and running a stock watcher that fetches real-time prices via Massive.com rest api, showcasing Python requests, classes, and object interactions.
Complete a banking system project in Python, applying week one to three fundamentals, including variables, control flow, functions, data structures, file handling, and databases.
Learn to build a stock watcher project by calling the Massive.com real-time stock API in Python, fetch live prices, parse JSON, and display results.
Build a Python stock watcher that fetches previous day close prices via a REST API. Test with offline mode and manage a watch list with add, list, view, and remove.
Complete day 5 of week 3 by building a stock watcher that uses a live rest api call to Massive.com, fetching real-time prices and printing them.
Welcome to Python: Zero to Professional. I’m excited to have you here.
Whether you are completely new to programming or someone with basic exposure looking to build real-world Python skills, this course is designed specifically for you. In this course, we will start from absolute basics—things like what Python is, how to write your first program—and gradually move into professional-level topics such as object-oriented programming, automation, working with APIs, databases, and building complete projects.
You do not need any prior coding experience. I will explain every concept step by step, with practical examples and hands-on exercises.
By the end of this course, you will be able to confidently write Python programs, automate tasks, and build portfolio-ready projects that you can showcase in interviews or use in your own work.
Make sure you code along with me. Learning programming is a hands-on skill, and the more you practice, the better you will get.
The course is divided into multiple sections. Each section focuses on a specific theme, such as Python fundamentals, control flow, data structures, object-oriented programming, and automation.
Each lecture is intentionally kept short—usually between eight and ten minutes—so you can stay focused and easily revisit topics later.
After most sections, you’ll find hands-on exercises, quizzes, and mini-projects. These are extremely important. Watching videos alone is not enough—you must practice writing code.
Towards the end of the course, we will build multiple capstone projects. These projects bring together everything you have learned and are designed to be added to your professional portfolio.