pyparsing 2.0.0 installation error

error.log

alvaro@ideas:/tmp
$ virtualenv 
alvaro@ideas:/tmp
$ virtualenv pyparsing-test
New python executable in pyparsing-test/bin/python
Installing setuptools............done.
Installing pip...............done.
alvaro@ideas:/tmp
$ source pyparsing-test/bin/activate
(pyparsing-test)alvaro@ideas:/tmp
$ pip install python-graph-dot
Downloading/unpacking python-graph-dot
  Downloading python-graph-dot-1.8.2.tar.gz
  Running setup.py egg_info for package python-graph-dot
    
Downloading/unpacking python-graph-core==1.8.2 (from python-graph-dot)
  Downloading python-graph-core-1.8.2.tar.gz
  Running setup.py egg_info for package python-graph-core
    
Downloading/unpacking pydot (from python-graph-dot)
  Downloading pydot-1.0.28.tar.gz
  Running setup.py egg_info for package pydot
    Couldn't import dot_parser, loading of dot files will not be possible.
    
Downloading/unpacking pyparsing (from pydot->python-graph-dot)
  Downloading pyparsing-2.0.0.zip (1.3MB): 1.3MB downloaded
  Running setup.py egg_info for package pyparsing
    Traceback (most recent call last):
      File "<string>", line 16, in <module>
      File "/tmp/pyparsing-test/build/pyparsing/setup.py", line 9, in <module>
        from pyparsing import __version__ as pyparsing_version
      File "pyparsing.py", line 629
        nonlocal limit,foundArity
                     ^
    SyntaxError: invalid syntax
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):

  File "<string>", line 16, in <module>

  File "/tmp/pyparsing-test/build/pyparsing/setup.py", line 9, in <module>

    from pyparsing import __version__ as pyparsing_version

  File "pyparsing.py", line 629

    nonlocal limit,foundArity

                 ^

SyntaxError: invalid syntax

----------------------------------------
Command python setup.py egg_info failed with error code 1 in /tmp/pyparsing-test/build/pyparsing
Storing complete log in /home/alvaro/.pip/pip.log

test.sh

cd /tmp
virtualenv pyparsing-test
source pyparsing-test/bin/activate
pip install python-graph-dot