Executing jupyter nbconvert as shell command within notebook doesn't work anymore

[DG]

Hello,

    I am not sure when this started (perhaps with Jupyter 5?), but I used to be able to save an HTML copy of my notebook using this:

!jupyter nbconvert '$nb_path' --output '$nfname'

where nb_path is the full path of the notebook (.ipynb file) and nfname is the full path of the HTML file, ending in .html

Like I said, this used to work with no problem, but now I get:

["[NbConvertApp] WARNING | pattern '$nb_path' matched no files",

However, nb_path surely exists:

os.path.exists(nb_path)

returns True.

And, if I enter the same command in terminal, it works just fine. 

Any ideas?

[Thomas Kluyver]

The $nb_path syntax doesn't get replaced inside single quotes. Looking at the code for it in IPython, this is deliberate, and has not changed in quite a while. You can use double quotes ("$nb_path"), or you can use the format-style syntax ('{nb_path').

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[DG]

takowl, thank you. You are right. Replacing single quotes with double quotes made it work again. 

Coming from Python where single quotes and double quotes are equivalent, this is a bit disconcerting.