subscription-manager fails with - SyntaxError: invalid syntax

Issue

subscription-manager commands fail with:

# subscription-manager refresh
Traceback (most recent call last):
  File "/usr/sbin/subscription-manager", line 64, in <module>
    from subscription_manager.injectioninit import init_dep_injection
  File "/usr/lib64/python2.6/site-packages/subscription_manager/injectioninit.py", line 20, in <module>
    from subscription_manager.cache import ProductStatusCache, \
  File "/usr/lib64/python2.6/site-packages/subscription_manager/cache.py", line 30, in <module>
    import rhsm.connection as connection
  File "/usr/lib64/python2.6/site-packages/rhsm/connection.py", line 22, in <module>
    import dateutil.parser
  File "/usr/lib/python2.6/site-packages/dateutil/parser/__init__.py", line 2, in <module>
    from ._parser import parse, parser, parserinfo
  File "/usr/lib/python2.6/site-packages/dateutil/parser/_parser.py", line 476
    out = {key: self[strids[key]] for key in strids}