python.math.expression.parser.pymep

pymep can parse or evaluate math expressions.

This algorithm does not use a decision tree. It is a kind of Recursive Ascent Parser (https://en.wikipedia.org/wiki/Recursive_ascent_parser). In fact, it is LR parser (Left-Right Parser) without backtracking. This recursive algorithm is faster than decision trees

pypi version

https://pypi.org/project/pymep/

Installation

pip install pymep

Examples

Here you can see some examples:

Real Numbers:

from pymep.realParser import parse
from pymep.realParser import eval


#Real Expresion parser
fx="cos(10)"
print(parse(fx))

xi=5
fx = "1 + x"
print(eval(fx, xi))

var = {"x":"1+1", "Z":1}
eval(" 2*(-(((z*3)*sqrt(x^(2)))+3))",var)

For Complex Numbers:

from pymep.complexParser import parse
from pymep.complexParser import eval
from pymep.complex import Complex

#Operation with complex numbers
a = Complex(1,2)
print(a.__radd__(10).__complex__())
print(Complex.radd(10, a).__complex__())


#Complex Expresion parser
fx="cos(10+2j)"
print(parse(fx).__complex__())

xi=5
fx = "1 +j+x"
print(eval(fx, xi).__complex__())

var={"x":"1+2j", "Y":complex(2,1)}
f_x = "x-y"
eval(f_x,var).__complex__()

There is a full list of examples inside!!

Enjoy it!!

The java version of this library is: https://github.com/sbesada/java.math.expression.parser

NOTE: Regarding to the OS where you excute the tests, it is possible that some tests fail beacause of rounding issues. The mathematical library that was used in this project is "math". In the future, it is possible that the math library changes.

PD: If you think that my work deserves a donation, you can do it: https://sbesada.github.io/