A code snippet that allows arbitrary code to be executed given a set of inputs. The expected outputs will be returned.

exec_code.py

def exec_code(code, inputs, outputs):
    """Execute the provided code given the inputs, return a dictonary of the outputs.

    Keyword arguments:
    code    -- the python code to run.
    inputs  -- a dictionary of variable/initial values.
    outputs -- the list of output variables to preserve from the run.

    """
    for variable, value in inputs.items():
        exec(variable + '=' + str(value))
    for variable in outputs:
        exec(variable + '=' + str('0'))

    exec code

    results = {}
    for variable in outputs:
        results[variable] = locals().get(variable, None)

    return results