| name | calculator |
| description | Evaluate math expressions and do exact/precise calculations using Python. Use for arithmetic, percentages, exponents, roots, trigonometry, logarithms, big-number or high-precision math, financial math (interest, tips, splits), and unit-free numeric problems where a wrong digit matters. Triggers on mentions of calculate, compute, how much is, percent, square root, power, sum, average, 算, 计算, 百分之, 平方根, 多少. |
| license | Proprietary. LICENSE.txt has complete terms |
| compatibility | Requires python3. Works on macOS, Linux, and Windows. |
Calculator
Do not do multi-step arithmetic in your head — run it. A single wrong digit erodes trust.
Use Python for any calculation beyond trivial one-step mental math.
Quick evaluation
python3 -c "print(2**32 - 1)"
python3 -c "print(0.1 + 0.2)"
python3 -c "import math; print(math.sqrt(2), math.log(1000, 10))"
Exact decimal / money (avoid float errors)
python3 -c "from decimal import Decimal as D; print(D('19.99')*D('3'))"
Percentages, tips, splits
python3 -c "bill=128.50; tip=0.18; n=4; total=bill*(1+tip); print(f'total={total:.2f}, per_person={total/n:.2f}')"
Stats over a list
python3 -c "import statistics as s; xs=[12,7,9,21,4]; print('mean',s.mean(xs),'median',s.median(xs),'stdev',round(s.pstdev(xs),3))"
Compound interest
python3 -c "p=10000; r=0.05; n=12; t=3; print(round(p*(1+r/n)**(n*t),2))"
Guidance
- Prefer
decimal.Decimal for money; prefer fractions.Fraction for exact rational results.
- Show the user the result, not the code, unless they ask how.
- For symbolic algebra/calculus, use
sympy if available (python3 -c "import sympy" to check first).
- State units explicitly in the answer when the problem has them.
