Check based on doi

[tdegeus]

The following code can be used to obtain a BibTeX file from a doi

import sys
import urllib.request
from urllib.error import HTTPError

BASE_URL = 'http://dx.doi.org/'

doi = '10.1073/pnas.1906551116'

url = BASE_URL + doi
req = urllib.request.Request(url)
req.add_header('Accept', 'application/x-bibtex')
try:
    with urllib.request.urlopen(req) as f:
        bibtex = f.read().decode()
    print(bibtex)
except HTTPError as e:
    if e.code == 404:
        print('DOI not found.')
    else:
        print('Service unavailable.')
    sys.exit(1)

This could be optimised to check a BibTeX file