How do I find the path of current Ipython notebook?

Question

As simple as it sounds, how do I get the save path (location of the .ipynb file) from a cell within the notebook?

Answer 1

Turns out one can use some javascript magic to get the notebook path from some attributes in the HTML body of the notebook page:

%%javascript 
var kernel = IPython.notebook.kernel; 
var proj = window.document.body.getAttribute('data-project'); 
var path = window.document.body.getAttribute('data-notebook-path'); 
var command = "proj = " + "'"+proj+"'";
kernel.execute(command);
var command = "path = " + "'"+path+"'" kernel.execute(command)

After executing the above in a cell one can get the path by doing

import os 
os.path.join( proj, path) 

Answer 2

With Jupyter you can get the relative path of the notebook in the URL with:

%%javascript 
var kernel = Jupyter.notebook.kernel; 
var command = ["notebookPath = ",
               "'", window.document.body.dataset.notebookPath, "'" ].join('')
//alert(command)
kernel.execute(command)
var command = ["notebookName = ",
               "'", window.document.body.dataset.notebookName, "'" ].join('')
//alert(command)
kernel.execute(command)

Then you can check the python variables notebookName and notebookPath

I am not sure of the result in case of url prefix , and how to handle the case when you have already changed current directory in the notebook