Removed support for Python 3.7 and added unit testing for 3.12.

Author: kmvanbrunt

.github/CONTRIBUTING.md

@@ -10,7 +10,7 @@ We welcome pull requests from cmd2 users and seasoned Python developers alike! F
 
 Remember to feel free to ask for help by leaving a comment within the Issue.
 
-Working on your first pull request? You can learn how from this *free* series 
+Working on your first pull request? You can learn how from this *free* series
 [How to Contribute to an Open Source Project on GitHub](https://egghead.io/series/how-to-contribute-to-an-open-source-project-on-github).
 
 ###### If you've found a bug that is not on the board, [follow these steps](README.md#found-a-bug).
@@ -47,7 +47,7 @@ The tables below list all prerequisites along with the minimum required version
 
 | Prerequisite                                        | Minimum Version |
 | --------------------------------------------------- |-----------------|
-| [python](https://www.python.org/downloads/)         | `3.7`           |
+| [python](https://www.python.org/downloads/)         | `3.8`           |
 | [pyperclip](https://github.com/asweigart/pyperclip) | `1.6`           |
 | [setuptools](https://pypi.org/project/setuptools/)  | `34.4`          |
 | [wcwidth](https://pypi.python.org/pypi/wcwidth)     | `0.1.7`         |
@@ -81,32 +81,32 @@ $ pip freeze | grep pyperclip
 
 If your versions are lower than the prerequisite versions, you should update.
 
-If you do not already have Python installed on your machine, we recommend using the 
-[Anaconda](https://www.continuum.io/downloads) distribution because it provides an excellent out-of-the-box install on 
-all platforms (Windows, Mac, and Linux) and because it supports having multiple Python environments (versions of Python) 
+If you do not already have Python installed on your machine, we recommend using the
+[Anaconda](https://www.continuum.io/downloads) distribution because it provides an excellent out-of-the-box install on
+all platforms (Windows, Mac, and Linux) and because it supports having multiple Python environments (versions of Python)
 installed simultaneously.
 
 ### Forking the project
 
 #### Setting up your system
 
-1. Install [Git](https://git-scm.com/) or your favorite Git client.  If you aren't comfortable with Git at the 
-command-line, then both [SmartGit](http://www.syntevo.com/smartgit/) and [GitKraken](https://www.gitkraken.com) are 
+1. Install [Git](https://git-scm.com/) or your favorite Git client.  If you aren't comfortable with Git at the
+command-line, then both [SmartGit](http://www.syntevo.com/smartgit/) and [GitKraken](https://www.gitkraken.com) are
 excellent cross-platform graphical Git clients.
 2. (Optional) [Set up an SSH key](https://help.github.com/articles/generating-an-ssh-key/) for GitHub.
 3. Create a parent projects directory on your system. For this guide, it will be assumed that it is `~/src`.
 
 #### Forking cmd2
 
 1. Go to the top-level cmd2 repository: <https://github.com/python-cmd2/cmd2>
-2. Click the "Fork" button in the upper right hand corner of the interface 
+2. Click the "Fork" button in the upper right hand corner of the interface
 ([more details here](https://help.github.com/articles/fork-a-repo/))
 3. After the repository has been forked, you will be taken to your copy of the cmd2 repo at `yourUsername/cmd2`
 
 #### Cloning your fork
 
 1. Open a terminal / command line / Bash shell in your projects directory (_e.g.: `~/src/`_)
-2. Clone your fork of cmd2, making sure to replace `yourUsername` with your GitHub username. This will download the 
+2. Clone your fork of cmd2, making sure to replace `yourUsername` with your GitHub username. This will download the
 entire cmd2 repo to your projects directory.
 
 ```sh
@@ -164,13 +164,13 @@ Do this prior to every time you create a branch for a PR:
 
 ### Creating a branch
 
-Before you start working, you will need to create a separate branch specific to the issue or feature you're working on. 
+Before you start working, you will need to create a separate branch specific to the issue or feature you're working on.
 You will push your work to this branch.
 
 #### Naming your branch
 
-Name the branch something like `fix/xxx` or `feature/xxx` where `xxx` is a short description of the changes or feature 
-you are attempting to add. For example `fix/script-files` would be a branch where you fix something specific to script 
+Name the branch something like `fix/xxx` or `feature/xxx` where `xxx` is a short description of the changes or feature
+you are attempting to add. For example `fix/script-files` would be a branch where you fix something specific to script
 files.
 
 #### Adding your branch
@@ -191,22 +191,22 @@ $ git push origin [name_of_your_new_branch]
 
 
 ### Setting up for cmd2 development
-For doing cmd2 development, it is recommended you create a virtual environment using Conda or Virtualenv and install the 
+For doing cmd2 development, it is recommended you create a virtual environment using Conda or Virtualenv and install the
 package from the source.
 
 #### Create a new environment for cmd2 using Pipenv
-`cmd2` has support for using [Pipenv](https://docs.pipenv.org/en/latest/) for development.  
+`cmd2` has support for using [Pipenv](https://docs.pipenv.org/en/latest/) for development.
 
 `Pipenv` essentially combines the features of `pip` and `virtualenv` into a single tool.  `cmd2` contains a Pipfile which
- makes it extremely easy to setup a `cmd2` development environment using `pipenv`.  
+ makes it extremely easy to setup a `cmd2` development environment using `pipenv`.
 
-To create a virtual environment and install everything needed for `cmd2` development using `pipenv`, do the following 
+To create a virtual environment and install everything needed for `cmd2` development using `pipenv`, do the following
 from a GitHub checkout:
 ```sh
 pipenv install --dev
 ```
 
-To create a new virtualenv, using a specific version of Python you have installed (and on your PATH), use the 
+To create a new virtualenv, using a specific version of Python you have installed (and on your PATH), use the
 --python VERSION flag, like so:
 ```sh
 pipenv install --dev --python 3.8
@@ -219,8 +219,8 @@ pipenv shell
 
 #### Create a new environment for cmd2 using Conda
 ```sh
-$ conda create -n cmd2_py37 python=3.7
-$ conda activate cmd2_py37
+$ conda create -n cmd2_py38 python=3.8
+$ conda activate cmd2_py38
 ```
 
 #### Create a new environment for cmd using Virtualenv
@@ -233,15 +233,15 @@ pyenv versions
 # Install python version defined
 pyenv install 3.8.2
 ```
-With the Python version installed, you can set the virtualenv properly. 
+With the Python version installed, you can set the virtualenv properly.
 
 ```sh
 $ cd ~/src/cmd2
-$ virtualenv -p $(pyenv root)/versions/3.8.2/ cmd_py38 
+$ virtualenv -p $(pyenv root)/versions/3.8.2/ cmd_py38
 $ source ~/src/cmd2/bin/activate
 ```
 
-Assuming you cloned the repository to `~/src/cmd2` you can install cmd2 in 
+Assuming you cloned the repository to `~/src/cmd2` you can install cmd2 in
 [editable mode](https://pip.pypa.io/en/stable/reference/pip_install/#editable-installs).
 Changes to the source code are immediately available when the python interpreter
 imports `cmd2`, there is no need to re-install the module after every change. This
@@ -326,9 +326,9 @@ served (usually [http://localhost:8000](http://localhost:8000)).
 
 ### Static code analysis
 
-You should have some sort of [PEP 8](https://www.python.org/dev/peps/pep-0008/)-based linting running in your editor or 
+You should have some sort of [PEP 8](https://www.python.org/dev/peps/pep-0008/)-based linting running in your editor or
 IDE or at the command line before you commit code.  `cmd2` uses [flake8](http://flake8.pycqa.org/en/latest/) as part of
-its continuous integration (CI) process.  [pylint](https://www.pylint.org) is another good Python linter which can be 
+its continuous integration (CI) process.  [pylint](https://www.pylint.org) is another good Python linter which can be
 run at the command line but also can integrate with many IDEs and editors.
 
 > Please do not ignore any linting errors in code you write or modify, as they are meant to **help** you and to ensure a clean and simple code base.  Don't worry about linting errors in code you don't touch though - cleaning up the legacy code is a work in progress.
@@ -579,7 +579,7 @@ mostly automated. The manual steps are all git operations. Here's the checklist:
 1. Make sure all the unit tests pass with `invoke pytest` or `py.test`
 1. Make sure latest year in `LICENSE` matches current year
 1. Make sure `CHANGELOG.md` describes the version and has the correct release date
-1. Add a git tag representing the version number using ``invoke tag x.y.z`` 
+1. Add a git tag representing the version number using ``invoke tag x.y.z``
     * Where x, y, and z are all small non-negative integers
 1. (Optional) Run `invoke pypi-test` to clean, build, and upload a new release to [Test PyPi](https://test.pypi.org)
 1. Run `invoke pypi` to clean, build, and upload a new release to [PyPi](https://pypi.org/)

.github/workflows/ci.yml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
       fail-fast: false
     runs-on: ${{ matrix.os }}
     steps:

.github/workflows/doc.yml

@@ -12,7 +12,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        python-version: ["3.11"]
+        python-version: ["3.12"]
       fail-fast: false
     runs-on: ${{ matrix.os }}
     steps:

.github/workflows/format.yml

@@ -12,7 +12,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        python-version: ["3.11"]
+        python-version: ["3.12"]
       fail-fast: false
     runs-on: ${{ matrix.os }}
     steps:

.github/workflows/lint.yml

@@ -12,7 +12,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        python-version: ["3.11"]
+        python-version: ["3.12"]
       fail-fast: false
     runs-on: ${{ matrix.os }}
     steps:

.github/workflows/mypy.yml

@@ -12,7 +12,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        python-version: ["3.11"]
+        python-version: ["3.12"]
       fail-fast: false
     runs-on: ${{ matrix.os }}
     steps:

CHANGELOG.md

@@ -1,12 +1,13 @@
 ## 2.5.0 (TBD)
 * Breaking Change
-  * `cmd2` 2.5 supports Python 3.7+ (removed support for Python 3.6)
+  * `cmd2` 2.5 supports Python 3.8+ (removed support for Python 3.6 and 3.7)
 * Bug Fixes
   * Fixed issue where persistent history file was not saved upon SIGHUP and SIGTERM signals.
 * Enhancements
   * Removed dependency on `attrs` and replaced with [dataclasses](https://docs.python.org/3/library/dataclasses.html)
   * add `allow_clipboard` initialization parameter and attribute to disable ability to
     add output to the operating system clipboard
+  * Updated unit tests to be Python 3.12 compliant.
 * Deletions (potentially breaking changes)
   * Removed `apply_style` from `Cmd.pwarning()`.
 

README.md

@@ -32,14 +32,14 @@ The developers toolbox
 ![system schema](https://raw.githubusercontent.com/python-cmd2/cmd2/master/.github/images/graph.drawio.png)
 
 
-When creating solutions developers have no shortage of tools to create rich and smart user interfaces. 
-System administrators have long been duct taping together brittle workflows based on a menagerie of simple command line tools created by strangers on github and the guy down the hall. 
-Unfortunately, when CLIs become significantly complex the ease of command discoverability tends to fade quickly. 
-On the other hand, Web and traditional desktop GUIs are first in class when it comes to easily discovering functionality. 
+When creating solutions developers have no shortage of tools to create rich and smart user interfaces.
+System administrators have long been duct taping together brittle workflows based on a menagerie of simple command line tools created by strangers on github and the guy down the hall.
+Unfortunately, when CLIs become significantly complex the ease of command discoverability tends to fade quickly.
+On the other hand, Web and traditional desktop GUIs are first in class when it comes to easily discovering functionality.
 The price we pay for beautifully colored displays is complexity required to aggregate disperate applications into larger systems.
-`cmd2` fills the niche between high [ease of command discovery](https://clig.dev/#ease-of-discovery) applications and smart workflow automation systems. 
+`cmd2` fills the niche between high [ease of command discovery](https://clig.dev/#ease-of-discovery) applications and smart workflow automation systems.
 
-The `cmd2` framework provides a great mixture of both worlds. Application designers can easily create complex applications and rely on the cmd2 library to offer effortless user facing help and extensive tab completion. 
+The `cmd2` framework provides a great mixture of both worlds. Application designers can easily create complex applications and rely on the cmd2 library to offer effortless user facing help and extensive tab completion.
 When users become comfortable with functionality, cmd2 turns into a feature rich library enabling a smooth transition to full automation. If designed with enough forethought, a well implemented cmd2 application can serve as a boutique workflow tool. `cmd2` pulls off this flexibility based on two pillars of philosophy:
 
 * Tab Completion
@@ -78,7 +78,7 @@ On all operating systems, the latest stable version of `cmd2` can be installed u
 pip install -U cmd2
 ```
 
-cmd2 works with Python 3.7+ on Windows, macOS, and Linux. It is pure Python code with few 3rd-party dependencies.
+cmd2 works with Python 3.8+ 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/overview/installation.html) in the cmd2
@@ -97,7 +97,7 @@ The best way to learn the cmd2 api is to delve into the example applications loc
 Tutorials
 ---------
 
-* PyOhio 2019 presentation: 
+* PyOhio 2019 presentation:
     * [video](https://www.youtube.com/watch?v=pebeWrTqIIw)
     * [slides](https://github.com/python-cmd2/talks/blob/master/PyOhio_2019/cmd2-PyOhio_2019.pdf)
     * [example code](https://github.com/python-cmd2/talks/tree/master/PyOhio_2019/examples)
@@ -161,4 +161,4 @@ Projects using cmd2
 Possibly defunct but still good examples
 
 * [JSShell](https://github.com/Den1al/JSShell)
-* [FLASHMINGO](https://github.com/fireeye/flashmingo) 
+* [FLASHMINGO](https://github.com/fireeye/flashmingo)

cmd2/argparse_custom.py

@@ -270,17 +270,10 @@ def my_completer(self, text, line, begidx, endidx, arg_tokens)
     constants,
 )
 
-try:
-    from typing import (
-        Protocol,
-        runtime_checkable,
-    )
-except ImportError:
-    # Remove these imports when we no longer support Python 3.7
-    from typing_extensions import (  # type: ignore[assignment]
-        Protocol,
-        runtime_checkable,
-    )
+from typing import (
+    Protocol,
+    runtime_checkable,
+)
 
 
 if TYPE_CHECKING:  # pragma: no cover

docs/features/argument_processing.rst

@@ -78,9 +78,8 @@ Here's what it looks like::
 .. warning::
 
     It is important that each command which uses the ``@with_argparser``
-    decorator be passed a unique instance of a parser.  This limitation is due
-    to bugs in CPython prior to Python 3.7 which make it impossible to make a
-    deep copy of an instance of a ``argparse.ArgumentParser``.
+    decorator be passed a unique instance of a parser since command-specific
+    changes could be made to it.
 
 
 .. note::

docs/overview/installation.rst

@@ -7,7 +7,7 @@ Installation Instructions
 .. _setuptools: https://pypi.org/project/setuptools
 .. _PyPI: https://pypi.org
 
-``cmd2`` works on Linux, macOS, and Windows. It requires Python 3.7 or
+``cmd2`` works on Linux, macOS, and Windows. It requires Python 3.8 or
 higher, pip_, and setuptools_. If you've got all that, then you can just:
 
 .. code-block:: shell
@@ -30,7 +30,7 @@ higher, pip_, and setuptools_. If you've got all that, then you can just:
 Prerequisites
 -------------
 
-If you have Python 3 >=3.7 installed from `python.org
+If you have Python 3 >=3.8 installed from `python.org
 <https://www.python.org>`_, you will already have pip_ and setuptools_, but may
 need to upgrade to the latest versions:
 

noxfile.py

@@ -1,7 +1,7 @@
 import nox
 
 
-@nox.session(python=['3.11'])
+@nox.session(python=['3.12'])
 def docs(session):
     session.install(
         'sphinx',
@@ -17,7 +17,7 @@ def docs(session):
     )
 
 
-@nox.session(python=['3.7', '3.8', '3.9', '3.10', '3.11'])
+@nox.session(python=['3.8', '3.9', '3.10', '3.11', '3.12'])
 @nox.parametrize('plugin', [None, 'ext_test', 'template', 'coverage'])
 def tests(session, plugin):
     if plugin is None:
@@ -41,7 +41,7 @@ def tests(session, plugin):
         )
 
 
-@nox.session(python=['3.8', '3.9', '3.10', '3.11'])
+@nox.session(python=['3.8', '3.9', '3.10', '3.11', '3.12'])
 @nox.parametrize('step', ['mypy', 'flake8'])
 def validate(session, step):
     session.install('invoke', './[validate]')

plugins/ext_test/build-pyenvs.sh

@@ -8,7 +8,7 @@
 # version numbers are: major.minor.patch
 #
 # this script will delete and recreate existing virtualenvs named
-# cmd2-3.7, etc. It will also create a .python-version
+# cmd2-3.8, etc. It will also create a .python-version
 #
 # Prerequisites:
 #   - *nix-ish environment like macOS or Linux
@@ -23,7 +23,7 @@
 # virtualenvs will be added to '.python-version'. Feel free to modify
 # this list, but note that this script intentionally won't install
 # dev, rc, or beta python releases
-declare -a pythons=("3.7" "3.8" "3.9", "3.10", "3.11")
+declare -a pythons=("3.8" "3.9", "3.10", "3.11", "3.12")
 
 # function to find the latest patch of a minor version of python
 function find_latest_version {

plugins/ext_test/cmd2_ext_test/__init__.py

@@ -5,13 +5,7 @@
 Allows developers to exercise their cmd2 application using the PyScript interface
 """
 
-try:
-    # For python 3.8 and later
-    import importlib.metadata as importlib_metadata
-except ImportError:  # pragma: no cover
-    # Remove this import when we no longer support Python 3.7
-    # MyPy Issue # 1153 causes a spurious error that must be ignored
-    import importlib_metadata  # type: ignore
+import importlib.metadata as importlib_metadata
 
 try:
     __version__ = importlib_metadata.version(__name__)

plugins/ext_test/noxfile.py

@@ -1,7 +1,7 @@
 import nox
 
 
-@nox.session(python=['3.7', '3.8', '3.9', '3.10', '3.11'])
+@nox.session(python=['3.8', '3.9', '3.10', '3.11', '3.12'])
 def tests(session):
     session.install('invoke', './[test]')
     session.run('invoke', 'pytest', '--junit', '--no-pty')