further robustness for jupyter wrapping that I found by opening and closing ipynb files aggressively
further robustness for jupyter wrapping that I found by opening and closing ipynb files aggressively

tscholl2/smc,DrXyzzy/smc,tscholl2/smc,DrXyzzy/smc,DrXyzzy/smc,sagemathinc/smc,tscholl2/smc,sagemathinc/smc,sagemathinc/smc,tscholl2/smc,DrXyzzy/smc,sagemathinc/smc,tscholl2/smc