I have iPython Notebook through Anaconda. I accidentally deleted an important notebook, and I can\'t seem to find it in trash (I don\'t think iPy Notebooks go to the trash).
If you deleted it through the OS (rm file.ipynb) then you can probably get it from ~/.ipython_checkpoints/ However, if you deleted it from the browser menu option, it is gone (by design!).
See discussion here: https://github.com/jupyter/notebook/issues/405