Math expressions

Q: How to evaluate mathematical expressions from a Python string?

Pick

Sympy

• http://www.sympy.org/

from sympy import sympify

# simple math
sympify('x + 40').subs({'x': 2}).evalf()
42.0000000000000

# derivatives
sympify('diff(cos(x), x)').subs({'x': 42}).evalf()
0.916521547915634

# integrals
sympify('integrate(sin(x), x)').subs({'x': 42}).evalf()
0.399985314988351

Suitable

Simple Eval

• https://github.com/danthedeckie/simpleeval

Python Mathematical Expression Evaluator

• https://github.com/AxiaCore/py-expression-eval

• http://axiacore.com/blog/mathematical-expression-evaluator-python/

All

eval

• http://lybniz2.sourceforge.net/safeeval.html

• https://opensourcehacker.com/2014/10/29/safe-evaluation-of-math-expressions-in-pure-python/

Pyparsing

• https://stackoverflow.com/questions/2371436/evaluating-a-mathematical-expression-in-a-string/2371789#2371789

• http://pyparsing.wikispaces.com/file/view/fourFn.py

• http://pyparsing.wikispaces.com/file/view/fourFn.py

AST-based

• https://github.com/danthedeckie/simpleeval

• https://newville.github.io/asteval/

• https://stackoverflow.com/questions/2371436/evaluating-a-mathematical-expression-in-a-string/9558001#9558001

• https://docs.python.org/2/library/ast.html

Python Parser

• https://docs.python.org/2/library/parser.html

• https://stackoverflow.com/questions/594266/equation-parsing-in-python/5936822#5936822

• https://stackoverflow.com/questions/594266/equation-parsing-in-python/594294#594294

Python compiler

• https://stackoverflow.com/questions/594266/equation-parsing-in-python/594360#594360

Misc

• https://github.com/pydata/numexpr

• http://deeplearning.net/software/theano/

See also

• https://stackoverflow.com/questions/2371436/evaluating-a-mathematical-expression-in-a-string

• https://stackoverflow.com/questions/594266/equation-parsing-in-python

• https://stackoverflow.com/questions/9685946/math-operations-from-string

• http://www.sagemath.org/