Converting a python numeric expression to LaTeX

Question

I need to convert strings with valid python syntax such as:

\'1+2**(x+y)\'

and get the equivalent LaTeX:

$1+2^{x+y}$
         


        

Answer 1

Just a little fix to Geoff Reedy excellent answer:

class GenerateSymbols(defaultdict):
    def __missing__(self, key):
        self[key] = sympy.Symbol(key)
        return self[key]

Before it would not add the new item to the dict. Now you can use this with your expression:

d= GenerateSymbols()    
eq = '(-b-sqrt(b**2-4*a*c))/(2*a)'

and you can further simplify it before converting it to LaTeX:

sympy.latex(sympy.simplify(eval(eq,d)))

and you get this:

'$- \\frac{b + \\operatorname{sqrt}\\left(- 4 a c + b^{2}\\right)}{2 a}$'