Simple Python Calculator

First homework from the Academy: a command-line calculator written in Python, kept here as a record of learning progress.

Versions

File	What it is
Georgi's calculator.py	The original homework. Four operations (add, subtract, divide, multiply), menu text transliterated to Latin letters.
Calculator_functionality_upgrade.py	The improved version. Separate functions with docstrings, plus square root and power.

Features of the upgraded version

• Addition, subtraction, multiplication, division (division by zero returns a message instead of crashing)
• Square root and power
• Menu-driven input, with an __main__ guard so the functions can be imported

Not finished: option 7 (solving linear systems) is a placeholder. solve_linear_system is a stub and the menu only prints a message.

Run

Requires Python 3.8 or newer. No dependencies.

python Calculator_functionality_upgrade.py

Example session:

Enter first number: 12
Enter second number: 4
Select operation:
1. Add
...
Enter choice (1/2/3/4/5/6/7): 4
Result: 3.0

Known limitations

• Non-numeric input raises a ValueError; there is no input validation yet.
• Square root of a negative number raises a ValueError.
• The original script divides without a zero check.

Possible next steps

• Validate input with try/except
• Implement solve_linear_system (Gaussian elimination)
• Add unit tests for the functions

License

MIT License