Python solve equation for one variable
Question: I'm trying to solve an equation in python using SymPy. I have a generated
equation (something like `function = y(8.0-(y**3.0))` which I use with SymPy
to create a new equation like this: `eq = sympy.Eq(function, 2)` which outputs
`y(8.0-(y**3.0)) == 2`. but `sympy.solve(eq)` doesn't seem to work.

    
    
    >>> from sympy import Eq, Symbol as sym, solve
    >>> y = sym('y')
    >>> eqa = Eq(y(8.0-(y**3.0)), 8)
    >>> solve(eqa)
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
      File "/usr/lib/pymodules/python2.6/sympy/solvers/solvers.py", line 332, in solve
        result = tsolve(f, *symbols)
      File "/usr/lib/pymodules/python2.6/sympy/solvers/solvers.py", line 716, in tsolve
        raise NotImplementedError("Unable to solve the equation.")
    NotImplementedError: Unable to solve the equation.
    

thanks for reading.


Answer: Yours is a non linear equation ... So you can use `optimize.fsolve` for it.
For further details look for the function in this tutorial
[scipy](http://www.tau.ac.il/~kineret/amit/scipy_tutorial/)

