--- dot_parser.py.ori	2016-02-29 21:11:13.750652311 +0100
+++ dot_parser.py	2016-02-29 21:12:32.561408440 +0100
@@ -22,7 +22,7 @@
 
 from pyparsing import __version__ as pyparsing_version
 
-from pyparsing import ( nestedExpr, Literal, CaselessLiteral, Word, Upcase, OneOrMore, ZeroOrMore,
+from pyparsing import ( nestedExpr, Literal, CaselessLiteral, Word, OneOrMore, ZeroOrMore,
     Forward, NotAny, delimitedList, oneOf, Group, Optional, Combine, alphas, nums,
     restOfLine, cStyleComment, nums, alphanums, printables, empty, quotedString,
     ParseException, ParseResults, CharsNotIn, _noncomma, dblQuotedString, QuotedString, ParserElement )