Drop six dependency

.github/workflows/build.yml

@@ -23,7 +23,7 @@ jobs:
     - name: Install
       run: |
         python -m pip install --upgrade pip
-        pip install pytest mock pycodestyle coverage pylint six
+        pip install pytest mock pycodestyle coverage pylint
         pip install -e .
 
     - name: Lint

amodem/async_reader.py

@@ -3,7 +3,7 @@
 import logging
 import threading
 
-import six  # since `Queue` module was renamed to `queue` (in Python 3)
+from queue import Queue
 
 log = logging.getLogger()
 
@@ -11,7 +11,7 @@ log = logging.getLogger()
 class AsyncReader:
     def __init__(self, stream, bufsize):
         self.stream = stream
-        self.queue = six.moves.queue.Queue()
+        self.queue = Queue()
         self.stop = threading.Event()
         args = (stream, bufsize, self.queue, self.stop)
         self.thread = threading.Thread(target=AsyncReader._thread,

setup.py

@@ -24,7 +24,7 @@ setup(
     packages=['amodem'],
     tests_require=['pytest'],
     cmdclass={'test': PyTest},
-    install_requires=['numpy', 'six'],
+    install_requires=['numpy'],
     platforms=['POSIX'],
     classifiers=[
         'Development Status :: 5 - Production/Stable',

tox.ini

@@ -7,7 +7,6 @@ deps=
 	pycodestyle
 	coverage
 	pylint
-	six
 commands=
 	pycodestyle amodem/ scripts/
 	pylint --extension-pkg-whitelist=numpy --reports=no amodem --rcfile .pylintrc