Deprecate Python 3.4 and add support and testing for Python 3.8

.travis.yml

@@ -1,12 +1,7 @@
 language: python
 
-sudo: false  # false enables container-based build for fast boot times on Linux
-
 matrix:
     include:
-        - os: linux
-          python: 3.4
-          env: TOXENV=py34
         - os: linux
           python: 3.5
           env: TOXENV=py35
@@ -16,8 +11,11 @@ matrix:
         - os: linux
           python: 3.7
           dist: xenial
-          sudo: true  # Travis CI doesn't yet support official (non-development) Python 3.7 on container-based builds
           env: TOXENV=py37
+        - os: linux
+          python: 3.8-dev
+          dist: xenial
+          env: TOXENV=py38
         - os: linux
           python: 3.5
           env: TOXENV=docs

CHANGELOG.md

@@ -1,3 +1,9 @@
+## 0.9.14 (TBD, 2019
+* Enhancements
+    * Added support for and testing with Python 3.8, starting with 3.8 beta
+* Breaking Changes
+    * Python 3.4 reached its [end of life](https://www.python.org/dev/peps/pep-0429/) on March 18, 2019 and is no longer supported by `cmd2`
+
 ## 0.9.13 (June 14, 2019)
 * Bug Fixes
     * Fixed issue where the wrong terminator was being appended by `Statement.expanded_command_line()`

CONTRIBUTING.md

@@ -46,7 +46,7 @@ The tables below list all prerequisites along with the minimum required version
 
 | Prerequisite                                        | Minimum Version |
 | --------------------------------------------------- | --------------- |
-| [python](https://www.python.org/downloads/)         | `3.4`           |
+| [python](https://www.python.org/downloads/)         | `3.5`           |
 | [attrs](https://github.com/python-attrs/attrs)      | `16.3`          |
 | [colorama](https://github.com/tartley/colorama)     | `0.3.7`         |
 | [pyperclip](https://github.com/asweigart/pyperclip) | `1.5.27`        |

README.md

@@ -38,7 +38,7 @@ Main Features
 - Unicode character support
 - Good tab-completion of commands, sub-commands, file system paths, and shell commands
 - Automatic tab-completion of `argparse` flags when using one of the `cmd2` `argparse` decorators
-- Support for Python 3.4+ on Windows, macOS, and Linux
+- Support for Python 3.5+ on Windows, macOS, and Linux
 - Trivial to provide built-in help for all commands
 - Built-in regression testing framework for your applications (transcript-based testing)
 - Transcripts for use with built-in regression can be automatically generated from `history -t` or `load -t`
@@ -59,7 +59,7 @@ On all operating systems, the latest stable version of `cmd2` can be installed u
 pip install -U cmd2
 ```
 
-cmd2 works with Python 3.4+ on Windows, macOS, and Linux. It is pure Python code with few 3rd-party dependencies.
+cmd2 works with Python 3.5+ on Windows, macOS, and Linux. It is pure Python code with few 3rd-party dependencies.
 
 For information on other installation options, see
 [Installation Instructions](https://cmd2.readthedocs.io/en/latest/install.html) in the cmd2

azure-pipelines.yml

@@ -14,9 +14,6 @@ jobs:
   # Run the pipeline with multiple Python versions
   strategy:
     matrix:
-      Python34:
-        python.version: '3.4'
-        TOXENV: 'py34'
       Python35:
         python.version: '3.5'
         TOXENV: 'py35'

cmd2/cmd2.py

@@ -39,6 +39,7 @@
 import sys
 import threading
 from collections import namedtuple
+from contextlib import redirect_stdout
 from typing import Any, Callable, Dict, List, Mapping, Optional, Tuple, Type, Union, IO
 
 import colorama
@@ -103,12 +104,6 @@ def __subclasshook__(cls, C):
                     return True
             return NotImplemented
 
-# Python 3.4 require contextlib2 for temporarily redirecting stderr and stdout
-if sys.version_info < (3, 5):
-    # noinspection PyUnresolvedReferences
-    from contextlib2 import redirect_stdout
-else:
-    from contextlib import redirect_stdout
 
 # Detect whether IPython is installed to determine if the built-in "ipy" command should be included
 ipython_available = True

cmd2/pyscript_bridge.py

@@ -5,17 +5,11 @@
 """
 
 import sys
+from contextlib import redirect_stdout, redirect_stderr
 from typing import Optional
 
 from .utils import namedtuple_with_defaults, StdSim
 
-# Python 3.4 require contextlib2 for temporarily redirecting stderr and stdout
-if sys.version_info < (3, 5):
-    # noinspection PyUnresolvedReferences
-    from contextlib2 import redirect_stdout, redirect_stderr
-else:
-    from contextlib import redirect_stdout, redirect_stderr
-
 
 class CommandResult(namedtuple_with_defaults('CommandResult', ['stdout', 'stderr', 'stop', 'data'])):
     """Encapsulates the results from a cmd2 app command

docs/index.rst

@@ -73,7 +73,7 @@ Contents:
 Compatibility
 =============
 
-Tested and working with Python 3.4+ on Windows, macOS, and Linux.
+Tested and working with Python 3.5+ on Windows, macOS, and Linux.
 
 Index
 =====

docs/install.rst

@@ -6,7 +6,7 @@ This section covers the basics of how to install, upgrade, and uninstall ``cmd2`
 
 Installing
 ----------
-First you need to make sure you have Python 3.4+, pip_, and setuptools_.  Then you can just use pip to
+First you need to make sure you have Python 3.5+, pip_, and setuptools_.  Then you can just use pip to
 install from PyPI_.
 
 .. _pip: https://pypi.python.org/pypi/pip
@@ -25,7 +25,7 @@ install from PyPI_.
 
 Requirements for Installing
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~
-* If you have Python 3 >=3.4 installed from `python.org
+* If you have Python 3 >=3.5 installed from `python.org
   <https://www.python.org>`_, you will already have pip_ and
   setuptools_, but may need to upgrade to the latest versions:
 
@@ -124,10 +124,6 @@ If you wish to permanently uninstall ``cmd2``, this can also easily be done with
 
     pip uninstall cmd2
 
-Extra requirements for Python 3.4
----------------------------------
-``cmd2`` requires the ``contextlib2`` module for Python 3.4.  This is used to temporarily redirect
-stdout and stderr.  Also when using Python 3.4, ``cmd2`` requires the ``typing`` module backport.
 
 Extra requirement for macOS
 ===========================

setup.py

@@ -21,10 +21,10 @@
 License :: OSI Approved :: MIT License
 Programming Language :: Python
 Programming Language :: Python :: 3
-Programming Language :: Python :: 3.4
 Programming Language :: Python :: 3.5
 Programming Language :: Python :: 3.6
 Programming Language :: Python :: 3.7
+Programming Language :: Python :: 3.8
 Programming Language :: Python :: Implementation :: CPython
 Topic :: Software Development :: Libraries :: Python Modules
 """.splitlines())))  # noqa: E128
@@ -36,14 +36,12 @@
 EXTRAS_REQUIRE = {
     # Windows also requires pyreadline to ensure tab completion works
     ":sys_platform=='win32'": ['pyreadline'],
-    # Python 3.4 and earlier require contextlib2 for temporarily redirecting stderr and stdout
-    ":python_version<'3.5'": ['contextlib2', 'typing'],
     # Extra dependencies for running unit tests
     'test': ["gnureadline; sys_platform=='darwin'",  # include gnureadline on macOS to ensure it is available in tox env
-             "mock ; python_version<'3.6'",  # for python 3.5 and earlier we need the third party mock module
+             "mock ; python_version<'3.6'",  # for python 3.5 we need the third party mock module
              'codecov', 'pytest', 'pytest-cov', 'pytest-mock'],
     # development only dependencies:  install with 'pip install -e .[dev]'
-    'dev': ["mock ; python_version<'3.6'",  # for python 3.5 and earlier we need the third party mock module
+    'dev': ["mock ; python_version<'3.6'",  # for python 3.5 we need the third party mock module
             'pytest', 'codecov', 'pytest-cov', 'pytest-mock', 'tox', 'pylint',
             'sphinx', 'sphinx-rtd-theme', 'sphinx-autobuild', 'invoke', 'twine>=1.11',
             ]
@@ -63,7 +61,7 @@
     platforms=['any'],
     packages=['cmd2'],
     keywords='command prompt console cmd',
-    python_requires='>=3.4',
+    python_requires='>=3.5',
     setup_requires=SETUP_REQUIRES,
     install_requires=INSTALL_REQUIRES,
     extras_require=EXTRAS_REQUIRE,

tests/conftest.py

@@ -3,6 +3,7 @@
 Cmd2 unit/functional testing
 """
 import sys
+from contextlib import redirect_stdout, redirect_stderr
 from typing import Optional
 from unittest import mock
 
@@ -11,12 +12,6 @@
 import cmd2
 from cmd2.utils import StdSim
 
-# Python 3.4 require contextlib2 for temporarily redirecting stderr and stdout
-if sys.version_info < (3, 5):
-    # noinspection PyUnresolvedReferences
-    from contextlib2 import redirect_stdout, redirect_stderr
-else:
-    from contextlib import redirect_stdout, redirect_stderr
 
 # Prefer statically linked gnureadline if available (for macOS compatibility due to issues with libedit)
 try:

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = docs,py34,py35,py36,py37
+envlist = docs,py35,py36,py37,py38
 
 [pytest]
 testpaths = tests