core/various: python3 compat, prepare for python2 -> python3

see https://review.gluster.org/#/c/19788/,
    https://review.gluster.org/#/c/19871/,
    https://review.gluster.org/#/c/19952/, and
    https://review.gluster.org/#/c/20104/

This patch changes uses of xrange() to range(), as suggested by the
python 2to3 utility. https://www.geeksforgeeks.org/range-vs-xrange-python/
In Python 3, there is no xrange , but the range function behaves like
xrange in Python 2. (My concern is that range() in python2 may behave
differently until we "throw the switch" to switch to python3.)

Note: Fedora packaging guidelines require explicit shebangs, so
popular practices like #!/usr/bin/env python and #!/usr/bin/python
are not allowed; they must be #!/usr/bin/python2 or #!/usr/bin/python3

Note: Selected small fixes from 2to3 utility. Specifically apply,
basestring, funcattrs, idioms, numliterals, set_literal, types, urllib,
and zip have already been applied. Also version agnostic imports for
urllib, cpickle, socketserver, _thread, queue, etc., suggested by
Aravinda in https://review.gluster.org/#/c/19767/1

Note: these 2to3 fixes report no changes are necessary: asserts, buffer,
exec, execfile, exitfunc, filter, getcwdu, intern, itertools, metaclass,
methodattrs, ne, next, nonzero, operator, paren, raw_input, reduce,
reload, renames, repr, standarderror, sys_exc, throw, tuple_params,
xreadlines.

Change-Id: I16ae9f4e3a4fd02a0623fb6f9fdb7aaf65f2a8a9
updates: #411
Signed-off-by: Kaleb S. KEITHLEY <kkeithle@redhat.com>

2 files changed, 2 insertions, 2 deletions

diff --git a/extras/failed-tests.py b/extras/failed-tests.py
index 1ef1a954f4f..54406f91ad3 100755
--- a/extras/failed-tests.py
+++ b/extras/failed-tests.py
@@ -98,7 +98,7 @@ def get_summary(cut_off_date, reg_link):
     '''
     success_count = 0
     failure_count = 0
-    for page in xrange(0, MAX_BUILDS, 100):
+    for page in range(0, MAX_BUILDS, 100):
         build_info = requests.get(''.join([
                 BASE,
                 reg_link,
diff --git a/extras/rebalance.py b/extras/rebalance.py
index 69ce282b39e..871b06682d5 100755
--- a/extras/rebalance.py
+++ b/extras/rebalance.py
@@ -263,7 +263,7 @@ if __name__ == "__main__":
         while used < len(bricks):
                 best_place = used
                 best_score = get_score(bricks)
-                for i in xrange(used):
+                for i in range(used):
                         new_bricks = bricks[:]
                         del new_bricks[used]
                         new_bricks.insert(i,bricks[used])