Use pyupgrade to upgrade the code to use Python3 conventions (#138)

The pyupgrade project is available at
https://github.com/asottile/pyupgrade and can be installed through pip.

The pyupgrade tool automatically upgrades syntax for newer versions of
the language. As pyparsing is now Python 3 only, can apply some cleanups
and simplifications. Ran the tool using the following command:

    $ find . -name \*.py -exec pyupgrade --py3-plus {} \;

For now, pyparsing.py was skipped while it is refactored to a package.

1 files changed, 3 insertions, 3 deletions

diff --git a/examples/pythonGrammarParser.py b/examples/pythonGrammarParser.py
index 4a8adce..e3685a1 100644
--- a/examples/pythonGrammarParser.py
+++ b/examples/pythonGrammarParser.py
@@ -130,14 +130,14 @@ testlist1: test (',' test)*
 encoding_decl: NAME

 """

 

-class SemanticGroup(object):

+class SemanticGroup:

     def __init__(self,contents):

         self.contents = contents

         while self.contents[-1].__class__ == self.__class__:

             self.contents = self.contents[:-1] + self.contents[-1].contents

 

     def __str__(self):

-        return "{0}({1})".format(self.label,

+        return "{}({})".format(self.label,

                 " ".join([isinstance(c,str) and c or str(c) for c in self.contents]) )

 

 class OrList(SemanticGroup):

@@ -164,7 +164,7 @@ class Atom(SemanticGroup):
             self.contents = contents[0]

 

     def __str__(self):

-        return "{0}{1}".format(self.rep, self.contents)

+        return "{}{}".format(self.rep, self.contents)

 

 def makeGroupObject(cls):

     def groupAction(s,l,t):