Export Error

[BirkhoffG]

Hello nbdev Team,

I try to use nbdev to develop a prototyped library, but I constantly encounter this problem when I executing notebook2script():

Converted 00_rec.ipynb.
Converted 01_ts.ipynb.
Converted 02_nlp.ipynb.

KeyError Traceback (most recent call last)
~\Anaconda3\envs\ml_env\lib\sre_parse.py in parse_template(source, pattern)
1014 try:
-> 1015 this = chr(ESCAPES[this][1])
1016 except KeyError:

KeyError: '\l'

During handling of the above exception, another exception occurred:

error Traceback (most recent call last)
in
1 from nbdev.export import notebook2script
----> 2 notebook2script()

~\Anaconda3\envs\ml_env\lib\site-packages\nbdev\export.py in notebook2script(fname, silent, to_dict)
322 else: files = glob.glob(fname)
323 d = collections.defaultdict(list) if to_dict else None
--> 324 for f in sorted(files): d = _notebook2script(f, silent=silent, to_dict=d)
325 if to_dict: return d
326 else: add_init(Config().lib_path)

~\Anaconda3\envs\ml_env\lib\site-packages\nbdev\export.py in _notebook2script(fname, silent, to_dict)
298 with open(fname_out, 'a', encoding='utf8') as f: f.write(code)
299 if f'{e}.py' not in mod.modules: mod.modules.append(f'{e}.py')
--> 300 save_nbdev_module(mod)
301
302 if not silent: print(f"Converted {fname.name}.")

~\Anaconda3\envs\ml_env\lib\site-packages\nbdev\export.py in save_nbdev_module(mod)
259 code = _re_index_idx.sub("index = {"+ t +"}", code)
260 t = ',\n '.join([f'"{f}"' for f in mod.modules])
--> 261 code = _re_index_mod.sub(f"modules = [{t}]", code)
262 with open(fname, 'w') as f: f.write(code)
263

~\Anaconda3\envs\ml_env\lib\re.py in _subx(pattern, template)
307 def _subx(pattern, template):
308 # internal: Pattern.sub/subn implementation helper
--> 309 template = _compile_repl(template, pattern)
310 if not template[0] and len(template[1]) == 1:
311 # literal replacement

~\Anaconda3\envs\ml_env\lib\re.py in _compile_repl(repl, pattern)
298 def _compile_repl(repl, pattern):
299 # internal: compile replacement pattern
--> 300 return sre_parse.parse_template(repl, pattern)
301
302 def _expand(pattern, match, template):

~\Anaconda3\envs\ml_env\lib\sre_parse.py in parse_template(source, pattern)
1016 except KeyError:
1017 if c in ASCIILETTERS:
-> 1018 raise s.error('bad escape %s' % this, len(this))
1019 lappend(this)
1020 else:

error: bad escape \l at position 18

`
I have no idea where the code crash, but seems like there is some problems in my 03a_*.ipynb notebook since after I delete this notebook, everything works well. But after recreating this notebook and executing a few exports, this problem occurs again.

I am using Windows Anaconda, Jupyter Notebook.

Best

[sgugger]

It seems there is a special character in your notebook name (from the stack trace). Is it really named 03a_*.ipynb? That might be the source of the problem.

[BirkhoffG]

It seems there is a special character in your notebook name (from the stack trace). Is it really named 03a_*.ipynb? That might be the source of the problem.

My notebook's name is 03a_module_layers.ipynb.

[daviddemeij]

Maybe something goes wrong because of the backslashes used in Windows paths? Or has nbdev been tested on Windows already?

[sgugger]

No, this is not that. nbdev works on Windows and has been tested, with the exception of the diff command however (this will be fixed when I have time to rewrite it).

[hamelsmu]

@BirkhoffG can you supply a public version of this notebook ( or a stripped-down version thereof )? I would like to see if I can reproduce this error!

[hamelsmu]

@BirkhoffG this appears to definitely be something in your notebook. For example, if I open 00_export.ipynb and run the following cells

# copy existing notebook for testing
! cp 99_search.ipynb 03a_module_layers.ipynb
notebook2script('03a_module_layers.ipynb')

I don't see your error. Hope that helps

[sgugger]

I'm closing the issue since we can't reproduce and fix, please do not hesitate to reopen with an example of the bug (preferably with the notebook file that fails).

[Tom-TBT]

Hello,
I had a similar issue, I'm working with windows. The notebook2script() worked fine until I made submodules. After I got the error, I created new modules that aren't nested and they could be exported fine, so it seems that notebook2script() fails specifically the submodules.

Then I updated nbdev from 0.1.6 to the latest to date 0.2.12 and it worked fine. Hope it can help someone.