Unable to remove `lines_to_next_cell` metadata

If I have the following global configs:

c.NotebookApp.contents_manager_class = "jupytext.TextFileContentsManager"
c.ContentsManager.freeze_metadata = True

When I open a .py script that has the following content:

import os


print('hello1')



print('hello2')

Then hit the button “Save and Checkpoint” in the browser interface and open the script again in a text editor, the new content of the script is:

# + {"lines_to_next_cell": 2}
import os
# -


print('hello1')



# + {"lines_to_next_cell": 2}
print('hello2')

I’ve also tried to have in the global configs the following:

c.NotebookApp.contents_manager_class = "jupytext.TextFileContentsManager"
c.ContentsManager.freeze_metadata = True
c.ContentsManager.default_cell_metadata_filter = "-lines_to_next_cell"

But the behavior is still the same.

Shouldn’t the c.ContentsManager.freeze_metadata option save no metadata at all when the original files have no metadata?

If not, how can I remove the lines_to_next_cell metadata in this scenario?

Thanks in advance!

[mwouts]

Andre, there was indeed an issue with the combination of the user and the default filter. The fix is on its way. What I advice for now is that you remove the default cell metadata filter filter (as, anyway the metadata lines_to_next_cell is not expected to go to the text representation anymore).

[mwouts]

Hello Andre, Thanks for reporting this - this is clearly not intended !

For the next release I have been thinking of removing the freeze_metadata option and instead provide a better handling by default of scripts with no metadata (and, as you expect, add no metadata in that case - see also #124).

I am not in a position to test your example right now, but I will later on. Meanwhile, you may want to edit the metadata filter manually (in the notebook metadata), or give a try to the following configuration,

c.NotebookApp.contents_manager_class = "jupytext.TextFileContentsManager"
c.ContentsManager.default_notebook_metadata_filter = "-all"
c.ContentsManager.default_cell_metadata_filter = "-all"