Removed code for Python below 3.8

.flake8

@@ -0,0 +1,2 @@
+[flake8]
+max-line-length = 120

test/integration/test_io_raw_ssh.py

@@ -16,11 +16,13 @@
 import pytest
 import mock
 import threading
-import sys
 import platform
 
 
-pytestmark = pytest.mark.skipif(sys.version_info < (3, 4) or 'Linux' != platform.system(), reason="requires python3.4 or higher and skip for no Linux system.")
+pytestmark = pytest.mark.skipif(
+    "Linux" != platform.system(),
+    reason="Linux-only SSH PTY integration tests.",
+)
 
 
 def test_can_create_passive_sshshell_connection_using_same_api(passive_sshshell_connection_class):

test/integration/test_io_tcp.py

@@ -15,14 +15,8 @@
 import importlib
 import pytest
 import threading
-import sys
 
 
-python3_only = pytest.mark.skipif(sys.version_info < (3, 0),
-                                  reason="Not stable under Python2 which is no more supported.")
-
-
-@python3_only()
 def test_can_open_and_close_connection(tcp_connection_class,
                                        integration_tcp_server_and_pipe):
     """
@@ -43,7 +37,6 @@ def test_can_open_and_close_connection(tcp_connection_class,
     assert 'Client disconnected' in dialog_with_server
 
 
-@python3_only()
 def test_can_open_and_close_connection_as_context_manager(tcp_connection_class,
                                                           integration_tcp_server_and_pipe):
     from moler.threaded_moler_connection import ThreadedMolerConnection
@@ -62,7 +55,6 @@ def test_can_open_and_close_connection_as_context_manager(tcp_connection_class,
 # Note: different external-IO connection may have different naming for their 'send' method
 # however, they are uniformed via glueing with moler_connection.send()
 # external-IO 'send' method works on bytes; moler_connection performs encoding
-@python3_only()
 def test_can_send_binary_data_over_connection(tcp_connection_class,
                                               integration_tcp_server_and_pipe):
     from moler.threaded_moler_connection import ThreadedMolerConnection
@@ -82,7 +74,6 @@ def test_can_send_binary_data_over_connection(tcp_connection_class,
 # however, they are uniformed via glueing with moler_connection.data_received()
 # so, external-IO forwards data to moler_connection.data_received()
 # and moler-connection forwards it to anyone subscribed
-@python3_only()
 def test_can_receive_binary_data_from_connection(tcp_connection_class,
                                                  integration_tcp_server_and_pipe):
     from moler.threaded_moler_connection import ThreadedMolerConnection

test/test_helpers.py

@@ -8,7 +8,6 @@
 __email__ = 'grzegorz.latuszek@nokia.com, marcin.usielski@nokia.com'
 
 import copy
-import sys
 
 import mock
 import pytest
@@ -378,12 +377,7 @@ def test_diff_different_types():
     b = copy.deepcopy(a)
     b[3] = 4
     msg = diff_data(first_object=a, second_object=b)
-    if sys.version_info < (3, 0):
-        assert "root -> [3] True is type of <type 'bool'> but 4 is type of <type 'int'>" \
-               == msg
-    else:
-        assert "root -> [3] True is type of <class 'bool'> but 4 is type of <class 'int'>"\
-               == msg
+    assert "root -> [3] True is type of <class 'bool'> but 4 is type of <class 'int'>" == msg
 
 
 def test_diff_different_values():

test/test_moler_test.py

@@ -4,7 +4,6 @@
 __copyright__ = 'Copyright (C) 2018-2023, Nokia'
 __email__ = 'michal.ernst@nokia.com, marcin.usielski@nokia.com'
 
-import sys
 import pytest
 
 from moler.connection_observer import ConnectionObserver
@@ -13,10 +12,7 @@
 
 
 def __check_connection_observer_exception(err):
-    if sys.version_info >= (3, 0):
-        assert "some error inside observer" in str(err)
-    else:
-        assert "There were unhandled exceptions from test caught by Moler" in str(err)
+    assert "some error inside observer" in str(err)
 
 
 def test_moler_test_warn():