[PULL 4/4] iotests: Remove Python 2 compatibility code

[Kevin Wolf]

Some scripts check the Python version number and have two code paths to
accomodate both Python 2 and 3. Remove the code specific to Python 2 and
assert the minimum version of 3.6 instead (check skips Python tests in
this case, so the assertion would only ever trigger if a Python script
is executed manually).

Signed-off-by: Kevin Wolf <address@hidden>
Reviewed-by: Eduardo Habkost <address@hidden>
Reviewed-by: Thomas Huth <address@hidden>
Reviewed-by: Philippe Mathieu-Daudé <address@hidden>
Reviewed-by: John Snow <address@hidden>
Reviewed-by: Vladimir Sementsov-Ogievskiy <address@hidden>
---
 tests/qemu-iotests/044                   |  3 ---
 tests/qemu-iotests/163                   |  3 ---
 tests/qemu-iotests/iotests.py            | 13 +++----------
 tests/qemu-iotests/nbd-fault-injector.py |  7 +++----
 4 files changed, 6 insertions(+), 20 deletions(-)

diff --git a/tests/qemu-iotests/044 b/tests/qemu-iotests/044
index 05ea1f49c5..8b2afa2a11 100755
--- a/tests/qemu-iotests/044
+++ b/tests/qemu-iotests/044
@@ -28,9 +28,6 @@ import struct
 import subprocess
 import sys
 
-if sys.version_info.major == 2:
-    range = xrange
-
 test_img = os.path.join(iotests.test_dir, 'test.img')
 
 class TestRefcountTableGrowth(iotests.QMPTestCase):
diff --git a/tests/qemu-iotests/163 b/tests/qemu-iotests/163
index 081ccc8ac1..d94728e080 100755
--- a/tests/qemu-iotests/163
+++ b/tests/qemu-iotests/163
@@ -21,9 +21,6 @@
 import os, random, iotests, struct, qcow2, sys
 from iotests import qemu_img, qemu_io, image_size
 
-if sys.version_info.major == 2:
-    range = xrange
-
 test_img = os.path.join(iotests.test_dir, 'test.img')
 check_img = os.path.join(iotests.test_dir, 'check.img')
 
diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py
index b26271187c..9fb5181c3d 100644
--- a/tests/qemu-iotests/iotests.py
+++ b/tests/qemu-iotests/iotests.py
@@ -35,6 +35,7 @@ from collections import OrderedDict
 sys.path.append(os.path.join(os.path.dirname(__file__), '..', '..', 'python'))
 from qemu import qtest
 
+assert sys.version_info >= (3,6)
 
 # This will not work if arguments contain spaces but is necessary if we
 # want to support the override options that ./check supports.
@@ -250,10 +251,7 @@ def image_size(img):
     return json.loads(r)['virtual-size']
 
 def is_str(val):
-    if sys.version_info.major >= 3:
-        return isinstance(val, str)
-    else:
-        return isinstance(val, str) or isinstance(val, unicode)
+    return isinstance(val, str)
 
 test_dir_re = re.compile(r"%s" % test_dir)
 def filter_test_dir(msg):
@@ -935,12 +933,7 @@ def execute_test(test_function=None,
     else:
         # We need to filter out the time taken from the output so that
         # qemu-iotest can reliably diff the results against master output.
-        if sys.version_info.major >= 3:
-            output = io.StringIO()
-        else:
-            # io.StringIO is for unicode strings, which is not what
-            # 2.x's test runner emits.
-            output = io.BytesIO()
+        output = io.StringIO()
 
     logging.basicConfig(level=(logging.DEBUG if debug else logging.WARN))
 
diff --git a/tests/qemu-iotests/nbd-fault-injector.py 
b/tests/qemu-iotests/nbd-fault-injector.py
index 6b2d659dee..43f095ceef 100755
--- a/tests/qemu-iotests/nbd-fault-injector.py
+++ b/tests/qemu-iotests/nbd-fault-injector.py
@@ -48,10 +48,9 @@ import sys
 import socket
 import struct
 import collections
-if sys.version_info.major >= 3:
-    import configparser
-else:
-    import ConfigParser as configparser
+import configparser
+
+assert sys.version_info >= (3,6)
 
 FAKE_DISK_SIZE = 8 * 1024 * 1024 * 1024 # 8 GB
 
-- 
2.20.1