This is a basic math parser that can parse mathematical expressions.

Parses a variety of mathematical expressions, including:

• Integers (0, 1, 5, -7), Floats (3.14159, 2.7, 0.5)

• Basic arithmetic operations (+, -, \*, /, \*\*, //, %)

• Constants PI, TAU, NAN, E, INF

• Comparison operators (==, !=, <, >, <=, >=)

• Parentheses for grouping

• Mathematical functions (sin, cos, tan, abs, sqrt, log, fact, gcd, lcm, xor, int, float, min, max)

First, install it with:

pip install parsematic

Import the MathParser class:

from math_parser import MathParser

Create a MathParser instance:

parser = MathParser()

Use the parse() method to parse and evaluate an expression:

result = parser.parse("2 + 3 * (4 - 1)")
print(result) # Output: 11

Or, use it from the command line

python -m parsematic "2 + 3 * (4 - 1)"

Supported Operators:

• Arithmetic operators: +, -, \_, / (true division), // (floor division), \*\* (exponentiation), % (modulo)
• Comparison operators: ==, !=, <, >, <=, >=
• Supported Functions sin, cos, tan, abs, sqrt, log, fact (factorial), gcd (greatest common divisor), lcm (least common multiple), xor (bitwise exclusive or), int, float (type conversions), min, max

The parser will raise exceptions for invalid syntax or unsupported operations.

The parser currently does support constants or user-defined functions (although you have to modify MathFunc.funcs). (but not variables within the parser itself)

Pull requests are welcome!