Removed Python2 support

Closes: #6890

Some remarks,

- `# coding ... utf-8` statements are not needed
- isdigit on strings instead of a try-catch.
- Default opening mode is read, so we can do `open()` without the `'r'` everywhere
- Removed inheritinng from `object` class, it isn't necessary in python3.
- `super(ClassName, self)` can now be replaced with `super()`
- Use of itertools and `chain` on a couple places dealing with sets.
- Used the operator module instead of lambdas when warranted
    `itemgetter(0)` instead of `lambda x: x[0]`
    `attrgetter('name')` instead of `lambda x: x.name`
- `sorted` returns a list, so no need to use `list(sorted(...))`
- Removed `dict()` using dictionary comprehensions whenever possible
- Attempted to remove python3.2 support

Signed-off-by: alexrecuenco <alejandrogonzalezrecuenco@gmail.com>

1 files changed, 8 insertions, 8 deletions

diff --git a/tests/unit/cli/docker_client_test.py b/tests/unit/cli/docker_client_test.py
index 873c1ff3..941aed4f 100644
--- a/tests/unit/cli/docker_client_test.py
+++ b/tests/unit/cli/docker_client_test.py
@@ -55,7 +55,7 @@ class DockerClientTestCase(unittest.TestCase):
 
     def test_user_agent(self):
         client = docker_client(os.environ)
-        expected = "docker-compose/{0} docker-py/{1} {2}/{3}".format(
+        expected = "docker-compose/{} docker-py/{} {}/{}".format(
             compose.__version__,
             docker.__version__,
             platform.system(),
@@ -151,9 +151,9 @@ class TLSConfigTestCase(unittest.TestCase):
 
     def test_tls_client_and_ca_quoted_paths(self):
         options = {
-            '--tlscacert': '"{0}"'.format(self.ca_cert),
-            '--tlscert': '"{0}"'.format(self.client_cert),
-            '--tlskey': '"{0}"'.format(self.key),
+            '--tlscacert': '"{}"'.format(self.ca_cert),
+            '--tlscert': '"{}"'.format(self.client_cert),
+            '--tlskey': '"{}"'.format(self.key),
             '--tlsverify': True
         }
         result = tls_config_from_options(options)
@@ -185,9 +185,9 @@ class TLSConfigTestCase(unittest.TestCase):
             'DOCKER_TLS_VERIFY': 'false'
         })
         options = {
-            '--tlscacert': '"{0}"'.format(self.ca_cert),
-            '--tlscert': '"{0}"'.format(self.client_cert),
-            '--tlskey': '"{0}"'.format(self.key),
+            '--tlscacert': '"{}"'.format(self.ca_cert),
+            '--tlscert': '"{}"'.format(self.client_cert),
+            '--tlskey': '"{}"'.format(self.key),
             '--tlsverify': True
         }
 
@@ -230,7 +230,7 @@ class TLSConfigTestCase(unittest.TestCase):
         assert result.cert == (self.client_cert, self.key)
 
 
-class TestGetTlsVersion(object):
+class TestGetTlsVersion:
     def test_get_tls_version_default(self):
         environment = {}
         assert get_tls_version(environment) is None