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

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

This patch adds version agnostic imports for urllib, cpickle,
socketserver, _thread, queue, etc., suggested by Aravinda in
https://review.gluster.org/#/c/19767/1

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.

Note: these 2to3 fixes report no changes are necessary: 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: I8d393064a1837874d8b4bc87c8ce05c679664642
updates: #411
Signed-off-by: Kaleb S. KEITHLEY <kkeithle@redhat.com>

4 files changed, 16 insertions, 4 deletions

diff --git a/tools/glusterfind/src/brickfind.py b/tools/glusterfind/src/brickfind.py
index e24fb1f0bdf..6bfb997f5a0 100644
--- a/tools/glusterfind/src/brickfind.py
+++ b/tools/glusterfind/src/brickfind.py
@@ -13,7 +13,10 @@ import os
 import sys
 import logging
 from argparse import ArgumentParser, RawDescriptionHelpFormatter
-import urllib.request, urllib.parse, urllib.error
+try:
+    import urllib.parse as urllib
+except ImportError:
+    import urllib
 import time
 
 from utils import mkdirp, setup_logger, create_file, output_write, find
diff --git a/tools/glusterfind/src/changelog.py b/tools/glusterfind/src/changelog.py
index 608b5c7c2de..5897f790d4b 100644
--- a/tools/glusterfind/src/changelog.py
+++ b/tools/glusterfind/src/changelog.py
@@ -16,7 +16,10 @@ import xattr
 import logging
 from argparse import ArgumentParser, RawDescriptionHelpFormatter
 import hashlib
-import urllib.request, urllib.parse, urllib.error
+try:
+    import urllib.parse as urllib
+except ImportError:
+    import urllib
 import codecs
 
 import libgfchangelog
diff --git a/tools/glusterfind/src/conf.py b/tools/glusterfind/src/conf.py
index d91746bda13..fdab38badb1 100644
--- a/tools/glusterfind/src/conf.py
+++ b/tools/glusterfind/src/conf.py
@@ -9,7 +9,10 @@
 # cases as published by the Free Software Foundation.
 
 import os
-import ConfigParser
+try:
+    import configparser
+except ImportError:
+    import ConfigParser as configparser
 
 config = ConfigParser.ConfigParser()
 config.read(os.path.join(os.path.dirname(os.path.abspath(__file__)),
diff --git a/tools/glusterfind/src/nodeagent.py b/tools/glusterfind/src/nodeagent.py
index c337964c7db..4aed0e2ad96 100644
--- a/tools/glusterfind/src/nodeagent.py
+++ b/tools/glusterfind/src/nodeagent.py
@@ -14,7 +14,10 @@ import sys
 import os
 import logging
 from argparse import ArgumentParser, RawDescriptionHelpFormatter
-import urllib.request, urllib.parse, urllib.error
+try:
+    import urllib.parse as urllib
+except ImportError:
+    import urllib
 from errno import ENOTEMPTY
 
 from utils import setup_logger, mkdirp, handle_rm_error