Math Expression Evaluator#

Safely evaluate mathematical expressions with support for common functions.

Features#

• Safe evaluation (no arbitrary code execution)
• Common mathematical functions: sqrt, sin, cos, tan, log
• Constants: pi, e
• Basic arithmetic: +, -, *, /, **, %
• Pure Python, no external dependencies

Supported Functions#

FunctionDescriptionExamplesqrt(x)Square rootsqrt(144) = 12sin(x)Sine (radians)sin(pi/2) = 1cos(x)Cosine (radians)cos(0) = 1tan(x)Tangent (radians)tan(pi/4) = 1log(x)Natural loglog(e) = 1log10(x)Base 10 loglog10(100) = 2abs(x)Absolute valueabs(-5) = 5pow(x,y)Powerpow(2,8) = 256

Supported Constants#

• pi = 3.141592653589793
• e = 2.718281828459045

Usage Examples#

bash

# Basic arithmetic
python3 scripts/math_eval.py --expr "2 + 3 * 4"
# Result: 14

# Using functions
python3 scripts/math_eval.py --expr "sqrt(144) + pow(2, 10)"
# Result: 1028.0

# Constants
python3 scripts/math_eval.py --expr "2 * pi * 10"
# Result: 62.8318...

# Complex expression
python3 scripts/math_eval.py --expr "log(pow(e, 5)) + sqrt(81)"
# Result: 14.0

Safety#

The evaluator uses Python's eval() with a restricted namespace. Only mathematical functions and constants are available. No imports, no file access, no system commands.

Error Handling#

If the expression is invalid or contains unsafe operations:

json

{"error": "name 'os' is not defined"}

Exit code 1 on error.

Technical Details#

• Language: Python 3
• Dependencies: None (standard library only)
• License: MIT-0

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