Description of problem:
   On RHEL 6.8, Swift runs python26.  A dictionary comprehension reports a syntax
error that does not occur on python 2.7


Version-Release number of selected component (if applicable):
RHEL 6.8

How reproducible:
100% of the time.

Steps to Reproduce:
swift -A http://10.8.128.76/auth/1.0 -u testuser:swift -K 'N/wGw1h7SY5EdTrIH4P4V4DeeDyW36yJ7NCI6HLH'  list



Actual results:
Traceback (most recent call last):
   .
   .
   .
  File "/usr/lib/python2.6/site-packages/swiftclient/client.py", line 136
    return {key: safe_value(key, val) for (key, val) in headers}
                                        ^
SyntaxError: invalid syntax

Expected results:
a list of buckets

Additional info:
I changed the dictionary comprehension to an external for loop and the problem went away.   I think that the best thing here is for swift to run python 2.7