'Evaluate code within a restricted environment.
Similar to the r_eval() method, but the code will be granted access
to restricted versions of the standard I/O streams sys.stdin,
sys.stderr, and sys.stdout.
The code parameter must either be a string containing a Python
expression, or a compiled code object, which will be evaluated in
the restricted environment\'s __main__ module.  The value of the
expression or code object will be returned.'

def s_eval(self, *args):

    return self.s_apply(self.r_eval, args)
