Master Python with This Advanced Calculator! 💡 Functions, Security & Smart Logic Explained

🚀 Welcome to the Ultimate Python Calculator Tutorial!
In this video, we’ll build an advanced Python calculator that goes far beyond basic arithmetic. You’ll learn how to implement a powerful expression evaluator that can handle square roots, trigonometric functions, logarithms, exponentials, and more — all from the command line.

Whether you're a Python beginner aiming to level up or a self-taught programmer looking for practical applications, this project covers key programming concepts such as:

✅ Safe use of eval()
✅ Whitelisting functions for secure evaluation
✅ Math functions with math module
✅ Handling user input
✅ Writing modular, clean code
✅ Using if __name__ == "__main__" properly

🧮 What This Calculator Can Do:
This isn't your ordinary calculator. It supports:

➕ Basic arithmetic: +, -, *, /, %, //, **

🔢 Math functions:

sqrt(x) – square root

log(x), log10(x) – logarithms

exp(x) – exponential (e^x)

🧠 Trigonometric functions:

sin(x), cos(x), tan(x) (in radians)

Convert between radians() and degrees()

🔁 Parentheses support for complex expressions

🎯 Constants like pi and e

💥 All calculations are done securely by restricting access to unsafe Python features.

📚 What You Will Learn:
✔ How to safely use eval() in Python
✔ Why __builtins__ must be removed for secure environments
✔ Creating a dictionary of allowed functions (whitelisting)
✔ Using the math module for real-world math operations
✔ Validating and handling user input
✔ Writing clean, modular code
✔ The difference between log and log10, radians vs degrees, and more

🔐 Why Is This Secure?
We use eval() safely by:

Disabling all default built-in functions via '__builtins__': {}

Allowing only the safe math functions and constants from Python’s math module

Preventing dangerous code like file access, shell commands, or module imports

This keeps the calculator clean and safe even when accepting user input.

🛠 Technologies Used:
🐍 Python 3.x

📦 math module for mathematical operations

🧰 Terminal/Command Line Interface (CLI)

📌 Key Python Concepts Explained:
eval() and security best practices

Using math module for scientific computations

Trigonometry and angle conversions

__name__ == "__main__" usage in Python

Custom expression evaluators

Error handling with try/except

💬 Who Should Watch This?
🧑‍💻 Python beginners ready for the next step

💡 Anyone who wants to build real-world Python utilities

🔐 Learners interested in writing safe, secure code

🎓 Students practicing for coding interviews or assignments

👩‍🏫 Teachers looking for beginner-intermediate projects to teach

Like the video if you liked the project, comment if you have any doubts and subscribe my channel.