Does not work (python3)

[mgiugliano]

This is the error it returns. I hope it helps.

Traceback (most recent call last):
  File "/Users/michi/anaconda/lib/python3.6/site-packages/bibtexparser/bibdatabase.py", line 102, in expand_string
    self.strings[name])
KeyError: 'sep'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/michi/anaconda/bin/bibcure", line 177, in <module>
    main()
  File "/Users/michi/anaconda/bin/bibcure", line 130, in main
    bibtex = bibtexparser.loads(inputfile.read(), parser=parser)
  File "/Users/michi/anaconda/lib/python3.6/site-packages/bibtexparser/__init__.py", line 48, in loads
    return parser.parse(bibtex_str)
  File "/Users/michi/anaconda/lib/python3.6/site-packages/bibtexparser/bparser.py", line 147, in parse
    self._expr.parseFile(bibtex_file_obj)
  File "/Users/michi/anaconda/lib/python3.6/site-packages/bibtexparser/bibtexexpression.py", line 263, in parseFile
    return self.main_expression.parseFile(file_obj, parseAll=True)
  File "/Users/michi/anaconda/lib/python3.6/site-packages/pyparsing.py", line 2163, in parseFile
    return self.parseString(file_contents, parseAll)
  File "/Users/michi/anaconda/lib/python3.6/site-packages/pyparsing.py", line 1622, in parseString
    loc, tokens = self._parse( instring, 0 )
  File "/Users/michi/anaconda/lib/python3.6/site-packages/pyparsing.py", line 1379, in _parseNoCache
    loc,tokens = self.parseImpl( instring, preloc, doActions )
  File "/Users/michi/anaconda/lib/python3.6/site-packages/pyparsing.py", line 3919, in parseImpl
    return super(ZeroOrMore, self).parseImpl(instring, loc, doActions)
  File "/Users/michi/anaconda/lib/python3.6/site-packages/pyparsing.py", line 3858, in parseImpl
    loc, tmptokens = self_expr_parse( instring, preloc, doActions )
  File "/Users/michi/anaconda/lib/python3.6/site-packages/pyparsing.py", line 1379, in _parseNoCache
    loc,tokens = self.parseImpl( instring, preloc, doActions )
  File "/Users/michi/anaconda/lib/python3.6/site-packages/pyparsing.py", line 3530, in parseImpl
    ret = e._parse( instring, loc, doActions )
  File "/Users/michi/anaconda/lib/python3.6/site-packages/pyparsing.py", line 1379, in _parseNoCache
    loc,tokens = self.parseImpl( instring, preloc, doActions )
  File "/Users/michi/anaconda/lib/python3.6/site-packages/pyparsing.py", line 3395, in parseImpl
    loc, exprtokens = e._parse( instring, loc, doActions )
  File "/Users/michi/anaconda/lib/python3.6/site-packages/pyparsing.py", line 1379, in _parseNoCache
    loc,tokens = self.parseImpl( instring, preloc, doActions )
  File "/Users/michi/anaconda/lib/python3.6/site-packages/pyparsing.py", line 3530, in parseImpl
    ret = e._parse( instring, loc, doActions )
  File "/Users/michi/anaconda/lib/python3.6/site-packages/pyparsing.py", line 1379, in _parseNoCache
    loc,tokens = self.parseImpl( instring, preloc, doActions )
  File "/Users/michi/anaconda/lib/python3.6/site-packages/pyparsing.py", line 3395, in parseImpl
    loc, exprtokens = e._parse( instring, loc, doActions )
  File "/Users/michi/anaconda/lib/python3.6/site-packages/pyparsing.py", line 1379, in _parseNoCache
    loc,tokens = self.parseImpl( instring, preloc, doActions )
  File "/Users/michi/anaconda/lib/python3.6/site-packages/pyparsing.py", line 3395, in parseImpl
    loc, exprtokens = e._parse( instring, loc, doActions )
  File "/Users/michi/anaconda/lib/python3.6/site-packages/pyparsing.py", line 1379, in _parseNoCache
    loc,tokens = self.parseImpl( instring, preloc, doActions )
  File "/Users/michi/anaconda/lib/python3.6/site-packages/pyparsing.py", line 3919, in parseImpl
    return super(ZeroOrMore, self).parseImpl(instring, loc, doActions)
  File "/Users/michi/anaconda/lib/python3.6/site-packages/pyparsing.py", line 3858, in parseImpl
    loc, tmptokens = self_expr_parse( instring, preloc, doActions )
  File "/Users/michi/anaconda/lib/python3.6/site-packages/pyparsing.py", line 1379, in _parseNoCache
    loc,tokens = self.parseImpl( instring, preloc, doActions )
  File "/Users/michi/anaconda/lib/python3.6/site-packages/pyparsing.py", line 3395, in parseImpl
    loc, exprtokens = e._parse( instring, loc, doActions )
  File "/Users/michi/anaconda/lib/python3.6/site-packages/pyparsing.py", line 1379, in _parseNoCache
    loc,tokens = self.parseImpl( instring, preloc, doActions )
  File "/Users/michi/anaconda/lib/python3.6/site-packages/pyparsing.py", line 3717, in parseImpl
    return self.expr._parse( instring, loc, doActions, callPreParse=False )
  File "/Users/michi/anaconda/lib/python3.6/site-packages/pyparsing.py", line 1379, in _parseNoCache
    loc,tokens = self.parseImpl( instring, preloc, doActions )
  File "/Users/michi/anaconda/lib/python3.6/site-packages/pyparsing.py", line 3395, in parseImpl
    loc, exprtokens = e._parse( instring, loc, doActions )
  File "/Users/michi/anaconda/lib/python3.6/site-packages/pyparsing.py", line 1379, in _parseNoCache
    loc,tokens = self.parseImpl( instring, preloc, doActions )
  File "/Users/michi/anaconda/lib/python3.6/site-packages/pyparsing.py", line 3530, in parseImpl
    ret = e._parse( instring, loc, doActions )
  File "/Users/michi/anaconda/lib/python3.6/site-packages/pyparsing.py", line 1405, in _parseNoCache
    tokens = fn( instring, tokensStart, retTokens )
  File "/Users/michi/anaconda/lib/python3.6/site-packages/pyparsing.py", line 1049, in wrapper
    ret = func(*args[limit[0]:])
  File "/Users/michi/anaconda/lib/python3.6/site-packages/bibtexparser/bibtexexpression.py", line 260, in _string_expr_parse_action
    return self._string_expr_parse_action_fun(s, l, t)
  File "/Users/michi/anaconda/lib/python3.6/site-packages/bibtexparser/bparser.py", line 184, in <lambda>
    BibDataStringExpression.expression_if_needed(t)))
  File "/Users/michi/anaconda/lib/python3.6/site-packages/bibtexparser/bparser.py", line 178, in <lambda>
    maybe_interpolate = lambda expr: as_text(expr)
  File "/Users/michi/anaconda/lib/python3.6/site-packages/bibtexparser/bibdatabase.py", line 223, in as_text
    return text_string_or_expression.get_value()
  File "/Users/michi/anaconda/lib/python3.6/site-packages/bibtexparser/bibdatabase.py", line 184, in get_value
    return ''.join([BibDataString.expand_string(s) for s in self.expr])
  File "/Users/michi/anaconda/lib/python3.6/site-packages/bibtexparser/bibdatabase.py", line 184, in <listcomp>
    return ''.join([BibDataString.expand_string(s) for s in self.expr])
  File "/Users/michi/anaconda/lib/python3.6/site-packages/bibtexparser/bibdatabase.py", line 150, in expand_string
    return string_or_bibdatastring.get_value()
  File "/Users/michi/anaconda/lib/python3.6/site-packages/bibtexparser/bibdatabase.py", line 131, in get_value
    return self._bibdatabase.expand_string(self.name)
  File "/Users/michi/anaconda/lib/python3.6/site-packages/bibtexparser/bibdatabase.py", line 104, in expand_string
    raise(UndefinedString(name))
bibtexparser.bibdatabase.UndefinedString: 'sep'

[Benjamin-Lee]

I can confirm this issue on Python 3.6.