Equation.py

import random;random.seed()
from fractions import Fraction

def prettyGen():return random.randint(1,50)

def fractionGen():return Fraction(random.randint(1,50),random.randint(1,50))

class EquationGenerator:

    def __init__(self,format,*vars,**constMap):
        self.generators = constMap
        self.vars = vars
        self.equation = format

    def generate(self):
        vars = dict((var,var) for var in self.vars)
        for var in self.generators:
            vars[var] = self.generators.get(var,prettyGen)()
        return self.equation.format(**vars)

class LinearEquation(EquationGenerator):

    def __init__(self):
        EquationGenerator.__init__(self,"{y:} = {m:}{x:} + {b:}",'x','y',m=fractionGen,b=prettyGen)

if __name__=="__main__":
    eq = LinearEquation()
    print(eq.generate())