>>> g = pydot.graph_from_dot_file('test.dot')

Traceback (most recent call last):

  File "<stdin>", line 1, in <module>

  File "/usr/lib/python3/dist-packages/pydot.py", line 235, in graph_from_dot_file

    return graph_from_dot_data(data)

  File "/usr/lib/python3/dist-packages/pydot.py", line 220, in graph_from_dot_data

    return dot_parser.parse_dot_data(data)

  File "/usr/lib/python3/dist-packages/dot_parser.py", line 520, in parse_dot_data

    tokens = graphparser.parseString(data)

  File "/usr/lib/python3/dist-packages/pyparsing.py", line 1115, in parseString

    loc, tokens = self._parse( instring, 0 )

  File "/usr/lib/python3/dist-packages/pyparsing.py", line 983, in _parseNoCache

    preloc = self.preParse( instring, loc )

  File "/usr/lib/python3/dist-packages/pyparsing.py", line 940, in preParse

    loc = self._skipIgnorables( instring, loc )

  File "/usr/lib/python3/dist-packages/pyparsing.py", line 932, in _skipIgnorables

    loc,dummy = e._parse( instring, loc )

  File "/usr/lib/python3/dist-packages/pyparsing.py", line 989, in _parseNoCache

    loc,tokens = self.parseImpl( instring, preloc, doActions )

  File "/usr/lib/python3/dist-packages/pyparsing.py", line 2624, in parseImpl

    return self.expr._parse( instring, loc, doActions, callPreParse=False )

  File "/usr/lib/python3/dist-packages/pyparsing.py", line 989, in _parseNoCache

    loc,tokens = self.parseImpl( instring, preloc, doActions )

  File "/usr/lib/python3/dist-packages/pyparsing.py", line 2483, in parseImpl

    ret = e._parse( instring, loc, doActions )

  File "/usr/lib/python3/dist-packages/pyparsing.py", line 983, in _parseNoCache

    preloc = self.preParse( instring, loc )

  File "/usr/lib/python3/dist-packages/pyparsing.py", line 945, in preParse

    while loc < instrlen and instring[loc] in wt:

TypeError: 'in <string>' requires string as left operand, not int