What you can do anyway, if you control the Sage installation, is adding the Sage code you want to share between worksheets somewhere to Sage library. E.g. suppose you added a Python function my_blahblah to the file $SAGEROOT/devel/sage/sage/matrix/constructor.py Then you run sage -b to rebuild the library, and after that it is there: sage: from sage.matrix.constructor import my_blahblah sage: my_blahblah() 'foo'  If you want to have it available without importing, you can add this import statement to$SAGEROOT/devel/sage/sage/matrix/all.py, then this new function will be known right from the start of Sage.