Scientific Calculator

A scientific calculator for Python and the terminal. It handles arithmetic, trigonometry in degrees or radians, logarithms, roots and factorials, and it evaluates expressions safely without using eval.

No dependencies. Python 3.9+.

pip install scientific-calculator-v1

Command line

$ scientific-calculator add 2 3
Result: 5.0

$ scientific-calculator "2*sin(30) + sqrt(16) + 3!"
Result: 11.0

$ scientific-calculator --rad "cos(pi)"
Result: -1.0

$ scientific-calculator          # interactive mode
>>> 2^10
1024
>>> ans / 4
256.0
>>> quit

Interactive mode understands help, deg, rad, ans (the last result) and quit.

You can also run it as a module: python -m scientific_calculator.cli add 2 3.

Operations

Expressions support + - * / // % **, with ^ meaning power. They also support parentheses, postfix !, the constants pi, e and tau, and all the functions above.

Python

from scientific_calculator import ScientificCalculator, evaluate

calc = ScientificCalculator()          # degrees
calc.sin(30)                           # 0.5
calc.log(8, 2)                         # 3.0
calc.factorial(5)                      # 120
calc.evaluate("2 * sin(30) + sqrt(16)")  # 5.0

ScientificCalculator(angle_unit="rad").sin(3.14159 / 2)  # ≈ 1.0
evaluate("(2 + 1)! ^ 2")               # 36

Invalid input such as sqrt(-1), 1/0 or an unknown function raises ValueError with a clear message.

Changelog

• 0.3.1: expression evaluation, interactive mode, radians mode, asin/acos/atan, ln, cbrt, root, factorial, mod, percent, abs; clean results such as sin(180) == 0.0; type hints; CI.
• 0.2.1: first PyPI release; scientific-calculator command.

License

MIT License. See LICENSE.