|   | 1 |  initial version  | 
You can use fast_callable to compile a symbolic expression into something that evaluates more in the way of a python expression:
sage: fc=fast_callable(eq_y.rhs(),vars=[x,a])
sage: fc(0.0,1.0)
+infinity
 Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.
 
                
                Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.