In Tools -> Preferences go to Console -> Advanced settings -> Python executable
choose SAGE_ROOT/local/bin/python as the interpreter
go to Run -> Configure (F6)
choose Console -> Execute in a new dedicated Python console
optional: check Interact with the Python console after execution (convenient for debugging)
Now you can run your scripts with Run (F5) in Spyder's built-in console.
Tested with Spyder 2.3.8 and Sage 7.1.
- only works if the extension is .py
- no integration of the Sage class/function documentation