How to report a bug?

Bugs can be reported on github or via private communications.


  1. Make a minimal code, which reproduces the problem.
  2. Provide the code, the bibtex (if necessary), the output.
  3. For a parsing error, provide the expected output.
  4. For a crash, set the logger to the debug level (see below).

If you want to provide a patch (that’s wonderful! thank you), please, take few minutes to write a unit test that fails without your contribution.

Logging module to understand failures

Syntax of bibtex files is simple but there are many possible variations. This library probably fails for some of them.

Bibtexparser includes a large quantity of debug messages which helps to understand why and where the parser fails. The example below can be used to print these messages in the console.

import logging
import logging.config

logger = logging.getLogger(__name__)

    'version': 1,
    'disable_existing_loggers': False,
    'formatters': {
        'standard': {
            'format': '%(asctime)s [%(levelname)s] %(name)s %(funcName)s:%(lineno)d: %(message)s'
    'handlers': {
        'default': {
            'formatter': 'standard',
    'loggers': {
        '': {
            'handlers': ['default'],
            'level': 'DEBUG',
            'formatter': 'standard',
            'propagate': True

if __name__ == '__main__':
    bibtex = """@ARTICLE{Cesar2013,
      author = {Jean César},
      title = {An amazing title},
      year = {2013},
      month = jan,
      volume = {12},
      pages = {12--23},
      journal = {Nice Journal},
      abstract = {This is an abstract. This line should be long enough to test
      comments = {A comment},
      keywords = {keyword1, keyword2},

    with open('/tmp/bibtex.bib', 'w') as bibfile:

    from bibtexparser.bparser import BibTexParser

    with open('/tmp/bibtex.bib', 'r') as bibfile:
        bp = BibTexParser(

I recommend you to use this output if you would like to report a bug.