Opening non Notebook related scripts automatically adds metadata

Imagine I have a non-notebook related script which contents are:

print('Hello World')

If I open in it using the jupyter interface, after installing jupytext, it opens as if it were a notebook. Then if I do some minor edits and save it, its contents become:

# ---
# jupyter:
#   jupytext:
#     text_representation:
#       extension: .py
#       format_name: light
#       format_version: '1.3'
#       jupytext_version: 0.8.2
#   kernelspec:
#     display_name: Python 3
#     language: python
#     name: python3
#   language_info:
#     codemirror_mode:
#       name: ipython
#       version: 3
#     file_extension: .py
#     mimetype: text/x-python
#     name: python
#     nbconvert_exporter: python
#     pygments_lexer: ipython3
#     version: 3.7.0
#   toc:
#     nav_menu: {}
#     number_sections: true
#     sideBar: true
#     skip_h1_title: false
#     toc_cell: false
#     toc_position: {}
#     toc_section_display: block
#     toc_window_display: false
#   varInspector:
#     cols:
#       lenName: 16
#       lenType: 16
#       lenVar: 40
#     kernels_config:
#       python:
#         delete_cmd_postfix: ''
#         delete_cmd_prefix: 'del '
#         library: var_list.py
#         varRefreshCmd: print(var_dic_list())
#       r:
#         delete_cmd_postfix: ') '
#         delete_cmd_prefix: rm(
#         library: var_list.r
#         varRefreshCmd: 'cat(var_dic_list()) '
#     types_to_exclude:
#     - module
#     - function
#     - builtin_function_or_method
#     - instance
#     - _Feature
#     window_display: false
# ---

print('Hello World!')

Is there a way to avoid jupytext interfering with native python scripts?

[silverdna]

@mwouts I had the chance to give it a try now. So far it looks awesome! It fits perfectly the use of my team. Thank you for your support 😃

[silverdna]

Hi @mwouts,

Thanks for your support.

do you expect that Jupyter and Jupytext should behave differently? Should a notebook created with command line jupytext have the header when exported to a script again? I would think the two ways of creating an ipynb notebook from a script should give the same notebook.

As far as my understanding goes, I believe the behaviour should be the same from jupyter and jupytext.

Note that this is the default in Jupyter Lab (scripts can be opened as notebooks using a context menu, see the README). For Jupyter Notebook, we could easily have a parameter on Jupytext’s content manager to avoid classifying scripts as notebooks (classification of notebooks/non notebooks is done here).

This makes sense to me. The reasoning behind me opening this issue was seeing if it was possible to make jupytext as less intrusive (read, not changing default behaviour) as possible in functionalities (such as editing pure python scripts) that go outside of Jupytext core (notebooks).

At the same time I also see the option of editing script as notebooks with good eyes 😃

Hello @andrethrill , I have started working on this in the v0.8.4 branch.

That’s awesome. Thank you so much once again for your support!