Incorrect .ipynb > .py > .ipynb roundtrip

[lebigot]

I have a notebook cell which is only made of comments:

# …
# …
# …

When converting into .py and then back to .ipynb, the cell is transformed into pure Markdown, which is problematic (because the comments represent code that may have to be uncommented and run, sometimes).

In case this matters: the cell above contains Markdown, and the one below contains code.

[mwouts]

Thanks @lebigot for reporting. This was identified and resolved in current developement branch v0.6.0, with test https://github.com/mwouts/nbrmd/blob/v0.6.0/tests/test_read_simple_python.py#L170-L172

As I still have some work pending there (I'd like to refactor the parser), there might be a few days before the new version is released. Feel free to use the development version until that.