Subscription-manager commands fail with SyntaxError: invalid syntax traceback error related to python packages on RHEL

Issue

• The subscription-manager command encounters a SyntaxError: invalid syntax when the python-dateutil package is installed via the pip utility.

• Running the subscription-manager command results in a Python traceback SyntaxError: invalid syntax similar to the following:

  # subscription-manager status
  Traceback (most recent call last):
   File "/usr/sbin/subscription-manager", line 11, in <module>
    load_entry_point('subscription-manager==1.28.42', 'console_scripts', 'subscription-manager')()
   File "/usr/local/lib/python3.6/site-packages/pkg_resources/_init_.py", line 479, in load_entry_point
    return get_distribution(dist).load_entry_point(group, name)
   File "/usr/local/lib/python3.6/site-packages/pkg_resources/_init_.py", line 2861, in load_entry_point
    return ep.load()
   File "/usr/local/lib/python3.6/site-packages/pkg_resources/_init_.py", line 2465, in load
    return self.resolve()
   File "/usr/local/lib/python3.6/site-packages/pkg_resources/_init_.py", line 2471, in resolve
    module = _import(self.module_name, fromlist=['name_'], level=0)
   File "/usr/lib64/python3.6/site-packages/subscription_manager/scripts/subscription_manager.py", line 60, in
   <module>
    from subscription_manager.injectioninit import init_dep_injection
   File "/usr/lib64/python3.6/site-packages/subscription_manager/injectionunit.py", line 20, in <module>
    from subscription_manager.cache import ProductStatusCache
   File "/usr/lib64/python3.6/site-packages/subscription_manager/cache.py", line 31, in <module>
    import rhsm.connection as connection
   File "/usr/lib64/python3.6/site-packages/rhsm/connection.py", line 22, in <module>
    import dateutil.parser
   File "/usr/local/lib/python3.6/site-packages/dateutil/parser.py", line 158
    I.append("%s=%s" % (attr, `value`))
                              ^                 
  SyntaxError: invalid syntax