Drop Python 2.7 support / Require Python 3.10 (#2519)

* Drop Python 2.7 support / Require Python 3.10

Only test on Python 3 and bump minimal required python version to 3.10.

* Update CHANGELOG

* Allow to install on Python 3.4

* State intend to not artifially raise the required Python version

.github/ISSUE_TEMPLATE.md

@@ -4,7 +4,7 @@ Thanks for contributing to Pwntools!
 
 When reporting an issue, be sure that you are running the latest released version of pwntools (`pip install --upgrade pwntools`).
 
-Please verify that your issue occurs on 64-bit Ubuntu 14.04.  You can use the Dockerfile on `docker.io` for quick testing.
+Please verify that your issue occurs on 64-bit Ubuntu 22.04.  You can use the Dockerfile on `docker.io` for quick testing.
 
 ```
 $ docker pull pwntools/pwntools:stable

.github/workflows/ci.yml

@@ -7,9 +7,6 @@ jobs:
       matrix:
         python_version: ['3.10', '3.12']
         os: [ubuntu-latest]
-        include:
-          - python_version: '2.7'
-            os: ubuntu-22.04
     runs-on: ${{ matrix.os }}
     timeout-minutes: 30
     services:
@@ -66,17 +63,8 @@ jobs:
         sudo apt-get update && sudo apt-get install -y python3-pip gdb gdbserver
         /usr/bin/python -m pip install --break-system-packages rpyc || /usr/bin/python -m pip install rpyc
         gdb --batch --quiet --nx --nh --ex 'py import rpyc; print(rpyc.version.version)'
-    
-    - name: Cache for pip
-      uses: actions/cache@v4
-      if: matrix.python_version == '2.7'
-      with:
-        path: ~/.cache/pip
-        key: ${{ matrix.os }}-${{ matrix.python_version }}-cache-pip-${{ hashFiles('**/pyproject.toml', '**/requirements*.txt') }}
-        restore-keys: ${{ matrix.os }}-${{ matrix.python_version }}-cache-pip-
 
     - name: Set up Python ${{ matrix.python_version }}
-      if: matrix.python_version != '2.7'
       uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python_version }}
@@ -85,17 +73,6 @@ jobs:
           **/pyproject.toml
           **/requirements*.txt
 
-    - name: Set up Python 2.7
-      if: matrix.python_version == '2.7'
-      run: |
-        sudo apt-get update
-        sudo apt-get install -y \
-          python2.7 python2.7-dev python2-pip-whl
-        sudo ln -sf python2.7 /usr/bin/python
-        export PYTHONPATH=`echo /usr/share/python-wheels/pip-*py2*.whl`
-        sudo --preserve-env=PYTHONPATH python -m pip install --upgrade pip setuptools wheel
-        sudo chown -R $USER /usr/local/lib/python2.7
-
 
     - name: Verify tag against version
       if: github.event_name == 'push' && startsWith(github.event.ref, 'refs/tags')
@@ -155,10 +132,6 @@ jobs:
     - name: Install documentation dependencies
       run: pip install -r docs/requirements.txt
 
-    - name: Manually install non-broken Unicorn
-      if:   matrix.python_version == '2.7'
-      run:  pip install unicorn==2.0.0rc7
-
     - name: Disable yama ptrace_scope
       run: |
         echo 0 | sudo tee /proc/sys/kernel/yama/ptrace_scope # required by some gdb doctests
@@ -244,7 +217,6 @@ jobs:
         pwn libcdb hash b229d1da1e161f95e839cf90cded5f719e5de308
 
     - name: Build source and wheel distributions
-      if: matrix.python_version != '2.7'
       run: |
         python -m build
 

CHANGELOG.md

@@ -73,13 +73,16 @@ The table below shows which release corresponds to each branch, and what date th
 | [2.2.0](#220)    |          | Jan 5, 2015
 
 ## 5.0.0 (`dev`)
+
+- [#2519][2519] Drop Python 2.7 support / Require Python 3.10
 - [#2507][2507] Add `+LINUX` and `+WINDOWS` doctest options and start proper testing on Windows
 - [#2522][2522] Support starting a kitty debugging window with the 'kitten' command
 - [#2524][2524] Raise EOFError during `process.recv` when stdout closes on Windows
 - [#2526][2526] Properly make use of extra arguments in `packing` utilities. `sign` parameter requires keyword syntax to specify it.
 - [#2517][2517] Allow to passthru kwargs on `ssh.__getattr__` convenience function to fix SSH motd problems
 - [#2527][2527] Allow setting debugger path via `context.gdb_binary`
 
+[2519]: https://github.com/Gallopsled/pwntools/pull/2519
 [2507]: https://github.com/Gallopsled/pwntools/pull/2507
 [2522]: https://github.com/Gallopsled/pwntools/pull/2522
 [2524]: https://github.com/Gallopsled/pwntools/pull/2524
@@ -88,6 +91,7 @@ The table below shows which release corresponds to each branch, and what date th
 [2527]: https://github.com/Gallopsled/pwntools/pull/2527
 
 ## 4.15.0 (`beta`)
+
 - [#2508][2508] Ignore a warning when compiling with asm on nix
 - [#2471][2471] Properly close spawned kitty window
 - [#2358][2358] Cache output of `asm()`

README.md

@@ -32,9 +32,9 @@ To get you started, we've provided some example solutions for past CTF challenge
 
 # Installation
 
-Pwntools is best supported on 64-bit Ubuntu LTS releases (18.04, 20.04, 22.04, and 24.04).  Most functionality should work on any Posix-like distribution (Debian, Arch, FreeBSD, OSX, etc.).  
+Pwntools is best supported on 64-bit Ubuntu LTS releases (22.04 and 24.04).  Most functionality should work on any Posix-like distribution (Debian, Arch, FreeBSD, OSX, etc.).  
 
-Python3 is suggested, but Pwntools still works with Python 2.7.  Most of the functionality of pwntools is self-contained and Python-only.  You should be able to get running quickly with
+Pwntools supports Python 3.10+ since version 5.0.0.  Use Pwntools 4.x for older versions as well as Python 2.7. Most of the functionality of pwntools is self-contained and Python-only.  You should be able to get running quickly with
 
 ```sh
 sudo apt-get update

TESTING.md

@@ -4,7 +4,7 @@ Pwntools makes extensive use of unit tests and integration tests to ensure every
 
 ## Test Suite
 
-To run the test suite, it is best to use Ubuntu 12.04 or 14.04, and run the following commands.  **Be aware** that this will add a user to the machine, and create a public key for SSH login!
+To run the test suite, it is best to use Ubuntu 22.04 or 24.04, and run the following commands.  **Be aware** that this will add a user to the machine, and create a public key for SSH login!
 
 ```sh
 bash travis/install.sh
@@ -15,7 +15,7 @@ PWNLIB_NOTERM=1 make -C docs doctest
 
 ## Testing in Docker
 
-A `Dockerfile` has been provided which has a clean testing environment with Ubuntu Xenial.  It is very similar to the online Travis CI testing environment, but uses a more modern version of Ubuntu.
+A `Dockerfile` has been provided which has a clean testing environment with Ubuntu Jammy.  It is very similar to the online Github Actions CI testing environment, but uses a more modern version of Ubuntu.
 
 See `travis/docker/README.md` for more information.
 

docs/requirements.txt

@@ -2,23 +2,20 @@ capstone
 coverage[toml]
 python-dateutil
 doc2dash
-docutils<0.18; python_version<'3'
-docutils>=0.18; python_version>='3'
+docutils>=0.18
 intervaltree
 isort
 mako>=1.0.0
 paramiko>=1.15.2
 pip>=6.0.8
-pyelftools>=0.29, <0.30; python_version<'3'
-pyelftools>=0.29; python_version>='3'
+pyelftools>=0.29
 pygments>=2.0
 pypandoc
 pyserial>=2.7
 pysocks
 psutil
 requests>=2.5.1
 ropgadget>=5.3
-sphinx==1.8.6; python_version<'3'
-sphinx>=8.1.3, <9; python_version>='3'
+sphinx>=8.1.3, <9
 sphinx_rtd_theme
 sphinxcontrib-autoprogram<=0.1.5

docs/source/conf.py

@@ -99,7 +99,6 @@ def __setattr__(self, name, value):
 travis_ci = os.environ.get('USER') == 'travis'
 local_doctest = os.environ.get('USER') == 'pwntools'
 skip_android = True
-is_python2 = six.PY2
 '''
 
 autoclass_content = 'both'
@@ -388,16 +387,13 @@ def linkcode_resolve(domain, info):
 
 
 # -- Customization to Sphinx autodoc generation --------------------------------------------
-import sphinx.ext.autodoc
 
 # Test hidden members (e.g. def _foo(...))
 def dont_skip_any_doctests(app, what, name, obj, skip, options):
     return None
 
 autodoc_default_options = {'special-members': None, 'private-members': None}
 
-class _DummyClass(object): pass
-
 # doctest optionflags for platform-specific tests
 # they are skipped on other platforms
 WINDOWS = doctest.register_optionflag('WINDOWS')
@@ -407,33 +403,6 @@ class _DummyClass(object): pass
 # doctest optionflag for tests that haven't been looked at yet
 TODO = doctest.register_optionflag('TODO')
 
-class Py2OutputChecker(_DummyClass, doctest.OutputChecker):
-    def check_output(self, want, got, optionflags):
-        sup = super(Py2OutputChecker, self).check_output
-        if sup(want, got, optionflags):
-            return True
-        try:
-            rly_want = pwnlib.util.safeeval.const(want)
-            if sup(repr(rly_want), got, optionflags):
-                return True
-            rly_got = pwnlib.util.safeeval.const(got)
-            if rly_want == rly_got:
-                return True
-        except ValueError:
-            pass
-        rly_want = ' '.join(x[:2].replace('b"','"').replace("b'","'")+x[2:] for x in want.replace('\n','\n ').split(' ')).replace('\n ','\n')
-        if sup(rly_want, got, optionflags):
-            return True
-        rly_want = ' '.join(x[:2].replace('b"',' "').replace("b'"," '")+x[2:] for x in want.replace('\n','\n ').split(' ')).replace('\n ','\n')
-        if sup(rly_want, got, optionflags):
-            return True
-        for wantl, gotl in six.moves.zip_longest(want.splitlines(), got.splitlines(), fillvalue=''):
-            rly_want1 = '['.join(x[:2].replace('b"','"').replace("b'","'")+x[2:] for x in wantl.split('['))
-            rly_want2 = ' '.join(x[:2].replace('b"',' "').replace("b'"," '")+x[2:] for x in wantl.split(' '))
-            if not sup(rly_want1, gotl, optionflags) and not sup(rly_want2, gotl, optionflags):
-                return False
-        return True
-
 import sphinx.ext.doctest
 
 class PlatformDocTestRunner(sphinx.ext.doctest.SphinxDocTestRunner):
@@ -471,24 +440,16 @@ def test_runner(self):
     def test_runner(self, value):
         self._test_runner = PlatformDocTestRunner(value._checker, value._verbose, value.optionflags)
 
-def py2_doctest_init(self, checker=None, verbose=None, optionflags=0):
-    if checker is None:
-        checker = Py2OutputChecker()
-    doctest.DocTestRunner.__init__(self, checker, verbose, optionflags)
-
 if 'doctest' in sys.argv:
+    def setup(app):
+        app.add_builder(PlatformDocTestBuilder, override=True)
+        # app.connect('autodoc-skip-member', dont_skip_any_doctests)
+    # monkey patching paramiko due to https://github.com/paramiko/paramiko/pull/1661
+    import paramiko.client
+    import binascii
+    paramiko.client.hexlify = lambda x: binascii.hexlify(x).decode()
+    paramiko.util.safe_string = lambda x: '' # function result never *actually used*
 
-    if sys.version_info[:1] < (3,):
-        sphinx.ext.doctest.SphinxDocTestRunner.__init__ = py2_doctest_init
-    else:
-        def setup(app):
-            app.add_builder(PlatformDocTestBuilder, override=True)
-            # app.connect('autodoc-skip-member', dont_skip_any_doctests)
-        # monkey patching paramiko due to https://github.com/paramiko/paramiko/pull/1661
-        import paramiko.client
-        import binascii
-        paramiko.client.hexlify = lambda x: binascii.hexlify(x).decode()
-        paramiko.util.safe_string = lambda x: '' # function result never *actually used*
     class EndlessLoop(Exception): pass
     if hasattr(signal, 'alarm'):
         def alrm_handler(sig, frame):

docs/source/install.rst

@@ -1,7 +1,7 @@
 Installation
 ============
 
-Pwntools is best supported on 64-bit Ubuntu LTS releases (14.04, 16.04, 18.04, and 20.04).  Most functionality should work on any Posix-like distribution (Debian, Arch, FreeBSD, OSX, etc.).
+Pwntools is best supported on 64-bit Ubuntu LTS releases (22.04 and 24.04).  Most functionality should work on any Posix-like distribution (Debian, Arch, FreeBSD, OSX, etc.).
 
 Prerequisites
 -------------
@@ -21,11 +21,13 @@ Note: For Mac OS X you will need to have cmake ``brew install cmake`` and pkg-co
 Released Version
 -----------------
 
-pwntools is available as a ``pip`` package for both Python2 and Python3.
+pwntools is available as a ``pip`` package for Python3. Version v5.0.0 supports Python3.10 or later. Use v4 if you use earlier versions of Python.
 
 Python3
 ^^^^^^^
 
+The Python version required for installing Pwntools is kept as low as possible on a best-effort basis.  However, new features target Python3.10 and later.
+
 .. code-block:: bash
 
     $ sudo apt-get update
@@ -37,6 +39,8 @@ Python3
 Python2 (Deprecated)
 ^^^^^^^^^^^^^^^^^^^^
 
+Python2 support has been removed in Pwntools v5.0.0.  The last version to support Python2 was v4.15.0.
+
 NOTE: Pwntools maintainers STRONGLY recommend using Python3 for all future Pwntools-based scripts and projects.
 
 Additionally, due to `pip` dropping support for Python2, a specfic version of `pip` must be installed.

extra/docker/base/Dockerfile

@@ -20,9 +20,6 @@ RUN apt-get update \
         git \
         libssl-dev \
         libffi-dev \
-        python2.7 \
-        python2.7-dev \
-        python2-pip-whl \
         python3 \
         python3-pip \
         python3-dev \
@@ -40,8 +37,6 @@ RUN apt-get update \
         patchelf \
     && locale-gen en_US.UTF-8 \
     && update-locale LANG=en_US.UTF-8 \
-    && PYTHONPATH=`echo /usr/share/python-wheels/pip-*.whl` python2.7 -m pip install --no-cache-dir --upgrade pip setuptools wheel \
-    && python2.7 -m pip install --no-cache-dir --upgrade pwntools \
     && python3 -m pip install --no-cache-dir --upgrade pip \
     && python3 -m pip install --no-cache-dir --upgrade pwntools \
     && PWNLIB_NOTERM=1 pwn update \

extra/docker/beta/Dockerfile

@@ -1,7 +1,6 @@
 FROM pwntools/pwntools:stable
 
 USER root
-RUN python2.7 -m pip install --no-cache-dir --upgrade git+https://github.com/Gallopsled/pwntools@beta \
-    && python3 -m pip install --no-cache-dir --force-reinstall --upgrade git+https://github.com/Gallopsled/pwntools@beta
+RUN python3 -m pip install --no-cache-dir --force-reinstall --upgrade git+https://github.com/Gallopsled/pwntools@beta
 RUN PWNLIB_NOTERM=1 pwn update
 USER pwntools

extra/docker/dev/Dockerfile

@@ -1,7 +1,6 @@
 FROM pwntools/pwntools:stable
 
 USER root
-RUN python2.7 -m pip install --upgrade git+https://github.com/Gallopsled/pwntools@dev \
-    && python3 -m pip install --force-reinstall --upgrade git+https://github.com/Gallopsled/pwntools@dev
+RUN python3 -m pip install --force-reinstall --upgrade git+https://github.com/Gallopsled/pwntools@dev
 RUN PWNLIB_NOTERM=1 pwn update
 USER pwntools

extra/docker/develop/Dockerfile

@@ -5,8 +5,7 @@ ENV HISTFILE=/home/pwntools/.history
 
 # Uninstall existing versions of pwntools
 USER root
-RUN python2.7 -m pip uninstall -q -y pwntools \
-    && python3 -m pip uninstall -q -y pwntools
+RUN python3 -m pip uninstall -q -y pwntools
 
 # Switch back to the pwntools user from here forward
 USER pwntools
@@ -18,17 +17,14 @@ ENV PATH="/home/pwntools/.local/bin:${PATH}"
 
 # Install Pwntools to the home directory, make it an editable install
 RUN git clone https://github.com/Gallopsled/pwntools \
- && python2.7 -m pip install --upgrade --editable pwntools \
  && python3 -m pip install --upgrade --editable pwntools \
  && PWNLIB_NOTERM=1 pwn version
 
 # Requirements for running the tests
-RUN python2.7 -m pip install --upgrade --requirement pwntools/docs/requirements.txt \
-    && python3 -m pip install --upgrade --requirement pwntools/docs/requirements.txt
+RUN python3 -m pip install --upgrade --requirement pwntools/docs/requirements.txt
 
 # Python niceties for debugging
-RUN python2.7 -m pip install -U ipython ipdb \
-    && python3 -m pip install -U ipython ipdb
+RUN python3 -m pip install -U ipython ipdb
 
 # Dependencies from .travis.yml addons -> apt -> packages
 ARG DEBIAN_FRONTEND=noninteractive

extra/docker/stable/Dockerfile

@@ -1,7 +1,6 @@
 FROM pwntools/pwntools:base
 
 USER root
-RUN python2.7 -m pip install --no-cache-dir --upgrade git+https://github.com/Gallopsled/pwntools@stable \
-    && python3 -m pip install --no-cache-dir --force-reinstall --upgrade git+https://github.com/Gallopsled/pwntools@stable
+RUN python3 -m pip install --no-cache-dir --force-reinstall --upgrade git+https://github.com/Gallopsled/pwntools@stable
 RUN PWNLIB_NOTERM=1 pwn update
 USER pwntools

pwnlib/gdb.py

@@ -587,9 +587,6 @@ def debug(args, gdbscript=None, gdb_args=None, exe=None, ssh=None, env=None, por
 
     Using GDB Python API:
 
-    .. doctest::
-       :skipif: is_python2
-
         Debug a new process
 
         >>> io = gdb.debug(['echo', 'foo'], api=True)
@@ -994,9 +991,6 @@ def attach(target, gdbscript = '', exe = None, gdb_args = None, ssh = None, sysr
 
         Using GDB Python API:
 
-        .. doctest::
-           :skipif: is_python2
-
             >>> io = process('bash')
 
             Attach a debugger