Remove support for Python 2

.github/workflows/main.yml

@@ -7,7 +7,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [2.7, 3.6, 3.7, 3.8, 3.9, "3.10", 3.11]
+        python-version: [3.6, 3.7, 3.8, 3.9, "3.10", 3.11]
         os: [ubuntu-20.04, windows-2019]
 
     runs-on: ${{ matrix.os }}

CHANGES.rst

@@ -1,9 +1,8 @@
 2.0.0.dev0 (Next Release)
 -------------------------
 
-- Support for some older Python versions has been dropped.  On Python 3,
-  Py65 now requires Python 3.6 or later.  On Python 2, Py65 now requires
-  Python 2.7.
+- Support for some older Python versions has been dropped.  Py65
+  now requires Python 3.6 or later.
 
 - Fixed a bug with character input that would cause characters to be
   dropped when pasting in larger amounts of text.  This makes it possible

README.rst

@@ -20,9 +20,9 @@ Installation
 
 Py65 packages are `available <http://pypi.python.org/pypi/py65>`_ on the
 Python Package Index (PyPI).  You download them from there or you can
-use ``pip`` to automatically install or upgrade Py65::
+use ``pip3`` to automatically install or upgrade Py65::
 
-    $ pip install -U py65
+    $ pip3 install -U py65
 
 Devices
 -------

py65/monitor.py

@@ -22,6 +22,8 @@ import shlex
 import sys
 
 from asyncore import compact_traceback
+from urllib.request import urlopen
+
 from py65.devices.mpu6502 import MPU as NMOS6502
 from py65.devices.mpu65c02 import MPU as CMOS65C02
 from py65.devices.mpu65org16 import MPU as V65Org16
@@ -32,11 +34,6 @@ from py65.utils import console
 from py65.utils.conversions import itoa
 from py65.memory import ObservableMemory
 
-try:
-    from urllib2 import urlopen
-except ImportError: # Python 3
-    from urllib.request import urlopen
-
 class Monitor(cmd.Cmd):
 
     Microprocessors = {'6502': NMOS6502, '65C02': CMOS65C02,

py65/tests/test_monitor.py

@@ -2,12 +2,10 @@ import unittest
 import sys
 import os
 import tempfile
-from py65.monitor import Monitor
 
-try:
-    from StringIO import StringIO
-except ImportError: # Python 3
-    from io import StringIO
+from io import StringIO
+
+from py65.monitor import Monitor
 
 
 class MonitorTests(unittest.TestCase):

setup.py

@@ -3,14 +3,9 @@ __version__ = '2.0.0.dev0'
 import sys
 
 py_version = sys.version_info[:2]
-PY3 = py_version[0] == 3
 
-if PY3:
-    if py_version < (3, 4):
-        raise RuntimeError('On Python 3, Py65 requires Python 3.6 or later')
-else:
-    if py_version < (2, 7):
-        raise RuntimeError('On Python 2, Py65 requires Python 2.7 or later')
+if py_version < (3, 6):
+    raise RuntimeError('On Python 3, Py65 requires Python 3.6 or later')
 
 from setuptools import setup, find_packages
 
@@ -24,8 +19,6 @@ CLASSIFIERS = [
     'Natural Language :: English',
     'Operating System :: POSIX',
     'Programming Language :: Python',
-    'Programming Language :: Python :: 2',
-    'Programming Language :: Python :: 2.7',
     'Programming Language :: Python :: 3',
     'Programming Language :: Python :: 3.6',
     'Programming Language :: Python :: 3.7',