Merge pull request #40 from sholsapp/support-python2.6.6

Support Python 2.6

pex/bin/pex.py

@@ -54,7 +54,7 @@ def configure_clp():
       '%prog builds a PEX (Python Executable) file based on the given specifications: '
       'sources, requirements, their dependencies and other options')
 
-  parser = OptionParser(usage=usage, version='%prog {}'.format(__version__))
+  parser = OptionParser(usage=usage, version='%prog {0}'.format(__version__))
 
   parser.add_option(
       '--pypi', '--no-pypi',