homebrew-tap-ygg/Formula/python@3.13.rb

class PythonAT313 < Formula
  bottle do
    root_url "https://homebrew.mirror.ygg/bottles"
    sha256 cellar: "/opt/homebrew/Cellar", arm64_sequoia: "a7ce66c50eeee32186f6db8054ff259cf480942e8bf10767588d47cb45a97692"
    sha256 cellar: "/opt/homebrew/Cellar", arm64_tahoe: "02e3c9b06f15a5aef1509838ca3572f111588ffb395c638148b54b0cf041848e"
    sha256 cellar: "/usr/local/Cellar", sequoia: "f2d7049c87cba28e4dce89c45bd3566ccf51441cad33c19e9e67525c603c1453"
    sha256 cellar: "/home/linuxbrew/.linuxbrew/Cellar", x86_64_linux: "4cdbffcfe9e2b2d9a5c28597d8e00d2dc995962785c25a098b2e4d8298edec54"
  end
  desc "Interpreted, interactive, object-oriented programming language"
  homepage "https://www.python.org/"
  url "https://www.python.org/ftp/python/3.13.15/Python-3.13.15.tgz"
  sha256 "c28d9d213c09b5b5ab2c29812950e12f746999e099b82894231be954b26baed9"
  license "Python-2.0"
  compatibility_version 1

  livecheck do
    url "https://www.python.org/downloads/source/"
    regex(%r{href=.*?/Python[._-]v?(3\.13(?:\.\d+)*)\.t}i)
  end



  # https://devguide.python.org/versions/#versions
  deprecate! date: "2029-11-01", because: :deprecated_upstream
  disable! date: "2030-11-01", because: :deprecated_upstream

  depends_on "pkgconf" => :build
  depends_on "mpdecimal"
  depends_on "openssl@3"
  depends_on "sqlite"
  depends_on "xz"

  uses_from_macos "bzip2"
  uses_from_macos "expat", since: :sequoia
  uses_from_macos "libedit"
  uses_from_macos "libffi"
  uses_from_macos "ncurses"

  on_linux do
    depends_on "zlib-ng-compat"
  end

  link_overwrite "lib/python3.13/site-packages/pip*"
  link_overwrite "lib/python3.13/site-packages/wheel*"

  pypi_packages package_name:   "",
                extra_packages: %w[flit-core pip wheel]

  resource "flit-core" do
    url "https://files.pythonhosted.org/packages/46/ef/34533186e76c526d9ec17a1ad9a10c7354cbfb20f51583cc36dfe4bdccd0/flit_core-4.0.2.tar.gz"
    sha256 "b6929defd93884b584d7c87829e0e7b5c26ed6be17b0b873979019314aa841c8"
  end

  resource "packaging" do
    url "https://files.pythonhosted.org/packages/7d/fa/3944b40b07da9ce895c0e6303a5ab7d53da063554f534556b134a54d6093/packaging-26.3.tar.gz"
    sha256 "94edc256424af38762eb31306eed28beb9f0efc50a8837492c9d6fd6004aed79"
  end

  resource "pip" do
    url "https://files.pythonhosted.org/packages/db/96/e6f8e9d9d7b9cc4457092712a7e919c3186aa2c2fa9ffed2c5d29cc947e8/pip-26.2.tar.gz"
    sha256 "2d8542afcc84cdd8e846c2b36b2861fad1da376dd98f8e7113e9108a3c331690"
  end

  resource "wheel" do
    url "https://files.pythonhosted.org/packages/39/62/75f18a0f03b4219c456652c7780e4d749b929eb605c098ce3a5b6b6bc081/wheel-0.47.0.tar.gz"
    sha256 "cc72bd1009ba0cf63922e28f94d9d83b920aa2bb28f798a31d0691b02fa3c9b3"
  end

  # Modify default sysconfig to match the brew install layout.
  # Remove when a non-patching mechanism is added.
  # We (ab)use osx_framework_library to exploit pip behaviour to allow --prefix to still work.
  patch do
    file "Patches/python/3.13-sysconfig.diff"
    type :unofficial
    resolves "https://bugs.python.org/issue43976"
  end

  def lib_cellar
    on_macos do
      return frameworks/"Python.framework/Versions"/version.major_minor/"lib/python#{version.major_minor}"
    end
    on_linux do
      return lib/"python#{version.major_minor}"
    end
  end

  def site_packages_cellar = lib_cellar/"site-packages"

  # The HOMEBREW_PREFIX location of site-packages.
  def site_packages = HOMEBREW_PREFIX/"lib/python#{version.major_minor}/site-packages"

  def altinstall? = name != Formula["python3"].name

  def python3 = bin/"python#{version.major_minor}"

  def install
    # Unset these so that installing pip and setuptools puts them where we want
    # and not into some other Python the user has installed.
    ENV["PYTHONHOME"] = nil
    ENV["PYTHONPATH"] = nil

    # Override the auto-detection of libmpdec, which assumes a universal build.
    # This is currently an inreplace due to https://github.com/python/cpython/issues/98557.
    if OS.mac?
      inreplace "configure", "libmpdec_machine=universal",
                "libmpdec_machine=#{ENV["PYTHON_DECIMAL_WITH_MACHINE"] = Hardware::CPU.arm? ? "uint128" : "x64"}"
    end

    # The --enable-optimization and --with-lto flags diverge from what upstream
    # python does for their macOS binary releases. They have chosen not to apply
    # these flags because they want one build that will work across many macOS
    # releases. Homebrew is not so constrained because the bottling
    # infrastructure specializes for each macOS major release.
    args = %W[
      --prefix=#{prefix}
      --enable-ipv6
      --datarootdir=#{share}
      --datadir=#{share}
      --without-ensurepip
      --enable-loadable-sqlite-extensions
      --with-openssl=#{formula_opt_prefix("openssl@3")}
      --enable-optimizations
      --with-system-expat
      --with-system-libmpdec
      --with-readline=editline
    ]

    # Python re-uses flags when building native modules.
    # Since we don't want native modules prioritizing the brew
    # include path, we move them to [C|LD]FLAGS_NODIST.
    # Note: Changing CPPFLAGS causes issues with dbm, so we
    # leave it as-is.
    cflags         = []
    cflags_nodist  = ["-I#{HOMEBREW_PREFIX}/include"]
    ldflags        = []
    ldflags_nodist = ["-L#{HOMEBREW_PREFIX}/lib", "-Wl,-rpath,#{HOMEBREW_PREFIX}/lib"]
    cppflags       = ["-I#{HOMEBREW_PREFIX}/include"]

    if OS.mac?
      # Enabling LTO on Linux makes libpython3.*.a unusable for anyone whose GCC
      # install does not match the one in CI _exactly_ (major and minor version).
      # https://github.com/orgs/Homebrew/discussions/3734
      args << "--with-lto"
      args << "--enable-framework=#{frameworks}"
      args << "--with-dtrace"
      args << "--with-dbmliborder=ndbm"

      # Avoid linking to libgcc https://mail.python.org/pipermail/python-dev/2012-February/116205.html
      args << "MACOSX_DEPLOYMENT_TARGET=#{MacOS.version}"
    else
      args << "--enable-shared"
      args << "--with-dbmliborder="
    end

    # Allow python modules to use ctypes.find_library to find homebrew's stuff
    # even if homebrew is not a /usr/local/lib. Try this with:
    # `brew install enchant && pip install pyenchant`
    inreplace "./Lib/ctypes/macholib/dyld.py" do |f|
      f.gsub! "DEFAULT_LIBRARY_FALLBACK = [",
              "DEFAULT_LIBRARY_FALLBACK = [ '#{HOMEBREW_PREFIX}/lib', '#{formula_opt_lib("openssl@3")}',"
      f.gsub! "DEFAULT_FRAMEWORK_FALLBACK = [", "DEFAULT_FRAMEWORK_FALLBACK = [ '#{HOMEBREW_PREFIX}/Frameworks',"
    end

    args << "CFLAGS=#{cflags.join(" ")}" unless cflags.empty?
    args << "CFLAGS_NODIST=#{cflags_nodist.join(" ")}" unless cflags_nodist.empty?
    args << "LDFLAGS=#{ldflags.join(" ")}" unless ldflags.empty?
    args << "LDFLAGS_NODIST=#{ldflags_nodist.join(" ")}" unless ldflags_nodist.empty?
    args << "CPPFLAGS=#{cppflags.join(" ")}" unless cppflags.empty?

    # Disabled modules - provided in separate formulae
    args += %w[
      py_cv_module__tkinter=n/a
    ]

    system "./configure", *args
    system "make"

    ENV.deparallelize do
      # The `altinstall` target prevents the installation of files with only Python's major
      # version in its name. This allows us to link multiple versioned Python formulae.
      #   https://github.com/python/cpython#installing-multiple-versions
      #
      # Tell Python not to install into /Applications (default for framework builds)
      target = "#{"alt" if altinstall?}install"
      system "make", target, "PYTHONAPPSDIR=#{prefix}"
      system "make", "frameworkinstallextras", "PYTHONAPPSDIR=#{pkgshare}" if OS.mac?
    end

    if OS.mac?
      # Any .app get a " 3" attached, so it does not conflict with python 2.x.
      prefix.glob("*.app") { |app| mv app, app.to_s.sub(/\.app$/, " 3.app") }

      pc_dir = frameworks/"Python.framework/Versions"/version.major_minor/"lib/pkgconfig"
      # Symlink the pkgconfig files into HOMEBREW_PREFIX so they're accessible.
      (lib/"pkgconfig").install_symlink pc_dir.children

      # Prevent third-party packages from building against fragile Cellar paths
      bad_cellar_path_files = [
        lib_cellar/"_sysconfigdata__darwin_darwin.py",
        lib_cellar/"config-#{version.major_minor}-darwin/Makefile",
        pc_dir/"python-#{version.major_minor}.pc",
        pc_dir/"python-#{version.major_minor}-embed.pc",
      ]
      inreplace bad_cellar_path_files, prefix, opt_prefix

      # Help third-party packages find the Python framework
      inreplace lib_cellar/"config-#{version.major_minor}-darwin/Makefile",
                /^LINKFORSHARED=(.*)PYTHONFRAMEWORKDIR(.*)/,
                "LINKFORSHARED=\\1PYTHONFRAMEWORKINSTALLDIR\\2"

      # Symlink the pkgconfig files into HOMEBREW_PREFIX so they're accessible.
      (lib/"pkgconfig").install_symlink pc_dir.children

      # Fix for https://github.com/Homebrew/homebrew-core/issues/21212
      inreplace lib_cellar/"_sysconfigdata__darwin_darwin.py",
                %r{('LINKFORSHARED': .*?) (Python.framework/Versions/3.\d+/Python)'}m,
                "\\1 #{opt_prefix}/Frameworks/\\2'"

      # For an altinstall, remove symlinks that conflict with the main Python formula.
      rm frameworks.glob("Python.framework/{Headers,Python,Resources,Versions/Current}") if altinstall?
    else
      # Prevent third-party packages from building against fragile Cellar paths
      inreplace Dir[lib_cellar/"**/_sysconfigdata_*linux_x86_64-*.py",
                    lib_cellar/"config*/Makefile",
                    bin/"python#{version.major_minor}-config",
                    lib/"pkgconfig/python-3*.pc"],
                prefix, opt_prefix

      inreplace bin/"python#{version.major_minor}-config",
                'prefix_real=$(installed_prefix "$0")',
                "prefix_real=#{opt_prefix}"

      # For an altinstall, remove symlinks that conflict with the main Python formula.
      rm lib/"libpython3.so" if altinstall?
    end

    # Remove the site-packages that Python created in its Cellar.
    rm_r site_packages_cellar.children

    # Prepare a wheel of wheel to install later.
    common_pip_args = %w[
      -v
      --no-deps
      --no-binary :all:
      --no-index
      --no-build-isolation
    ]
    whl_build = buildpath/"whl_build"
    system python3, "-m", "venv", whl_build
    %w[flit-core wheel].each do |r|
      resource(r).stage do
        system whl_build/"bin/pip3", "install", *common_pip_args, "."
      end
    end
    resource("wheel").stage do
      system whl_build/"bin/pip3", "wheel", *common_pip_args,
                                            "--wheel-dir=#{libexec}",
                                            "."
    end

    # Replace bundled pip with our own.
    rm lib_cellar.glob("ensurepip/_bundled/pip-*.whl")
    resource("pip").stage do
      system whl_build/"bin/pip3", "wheel", *common_pip_args,
                                            "--wheel-dir=#{lib_cellar}/ensurepip/_bundled",
                                            "."
    end

    # Patch ensurepip to bootstrap our updated version of pip
    inreplace lib_cellar/"ensurepip/__init__.py" do |s|
      s.gsub!(/_PIP_VERSION = .*/, "_PIP_VERSION = \"#{resource("pip").version}\"")
    end

    # Ensure that our new pip wheel is globally readable.
    chmod "ugo+r", lib_cellar.glob("ensurepip/_bundled/pip-*.whl")

    # Install unversioned (and for an altinstall, major-versioned) symlinks in libexec/bin.
    {
      "idle"          => "idle#{version.major_minor}",
      "pydoc"         => "pydoc#{version.major_minor}",
      "python"        => "python#{version.major_minor}",
      "python-config" => "python#{version.major_minor}-config",
    }.merge(altinstall? ? {
      "idle3"          => "idle#{version.major_minor}",
      "pydoc3"         => "pydoc#{version.major_minor}",
      "python3"        => "python#{version.major_minor}",
      "python3-config" => "python#{version.major_minor}-config",
    } : {}).each do |short_name, long_name|
      (libexec/"bin").install_symlink (bin/long_name).realpath => short_name
    end

    # Bootstrap initial install of pip.
    system python3, "-Im", "ensurepip"

    # Install desired versions of pip, wheel using the version of
    # pip bootstrapped by ensurepip.
    # Note that while we replaced the ensurepip wheels, there's no guarantee
    # ensurepip actually used them, since other existing installations could
    # have been picked up (and we can't pass --ignore-installed).
    root_site_packages = lib/"python#{version.major_minor}/site-packages"
    bundled = lib_cellar/"ensurepip/_bundled"
    system python3, "-Im", "pip", "install", "-v",
           "--no-deps",
           "--no-index",
           "--upgrade",
           "--isolated",
           "--target=#{root_site_packages}",
           bundled/"pip-#{resource("pip").version}-py3-none-any.whl",
           libexec/"wheel-#{resource("wheel").version}-py3-none-any.whl"

    # pip install with --target flag will just place the bin folder into the
    # target, so move its contents into the appropriate location
    mv (root_site_packages/"bin").children, bin
    rmdir root_site_packages/"bin"

    rm bin/"pip"
    rm bin/"pip3" if altinstall?
    mv bin/"wheel", bin/"wheel#{version.major_minor}"
    bin.install_symlink "wheel#{version.major_minor}" => "wheel3" unless altinstall?

    # Install unversioned (and for an altinstall, major-versioned) symlinks in libexec/bin.
    {
      "pip"   => "pip#{version.major_minor}",
      "wheel" => "wheel#{version.major_minor}",
    }.merge(altinstall? ? {
      "pip3"   => "pip#{version.major_minor}",
      "wheel3" => "wheel#{version.major_minor}",
    } : {}).each do |short_name, long_name|
      (libexec/"bin").install_symlink (bin/long_name).realpath => short_name
    end

    if OS.mac?
      # Replace framework site-packages with a symlink to the real one.
      rm_r site_packages_cellar
      site_packages_cellar.parent.install_symlink root_site_packages
    end

    # Write out sitecustomize.py
    (lib_cellar/"sitecustomize.py").atomic_write(sitecustomize)

    # Mark Homebrew python as externally managed: https://peps.python.org/pep-0668/#marking-an-interpreter-as-using-an-external-package-manager
    # Placed after ensurepip since it invokes pip in isolated mode, meaning
    # we can't pass --break-system-packages.
    (lib_cellar/"EXTERNALLY-MANAGED").write <<~INI
      [externally-managed]
      Error=To install Python packages system-wide, try brew install
       xyz, where xyz is the package you are trying to
       install.

       If you wish to install a Python library that isn't in Homebrew,
       use a virtual environment:

         python3 -m venv path/to/venv
         source path/to/venv/bin/activate
         python3 -m pip install xyz

       If you wish to install a Python application that isn't in Homebrew,
       it may be easiest to use 'pipx install xyz', which will manage a
       virtual environment for you. You can install pipx with

         brew install pipx

       You may restore the old behavior of pip by passing
       the '--break-system-packages' flag to pip, or by adding
       'break-system-packages = true' to your pip.conf file. The latter
       will permanently disable this error.

       If you disable this error, we STRONGLY recommend that you additionally
       pass the '--user' flag to pip, or set 'user = true' in your pip.conf
       file. Failure to do this can result in a broken Homebrew installation.

       Read more about this behavior here: <https://peps.python.org/pep-0668/>
    INI
  end

  post_install_steps do
    on_macos do
      set_permissions "Python.framework/Versions/{{version.major_minor}}/" \
                      "lib/python{{version.major_minor}}/venv/scripts/**/*",
                      "u+w", base: :frameworks, recursive: false
    end
    on_linux do
      set_permissions "python{{version.major_minor}}/venv/scripts/**/*", "u+w", base: :lib, recursive: false
    end
  end

  def sitecustomize
    <<~PYTHON
      # This file is created by Homebrew and is executed on each python startup.
      # Don't print from here, or else python command line scripts may fail!
      # <https://docs.brew.sh/Homebrew-and-Python>
      import re
      import os
      import site
      import sys
      if sys.version_info[:2] != (#{version.major}, #{version.minor}):
          # This can only happen if the user has set the PYTHONPATH to a mismatching site-packages directory.
          # Every Python looks at the PYTHONPATH variable and we can't fix it here in sitecustomize.py,
          # because the PYTHONPATH is evaluated after the sitecustomize.py. Many modules (e.g. PyQt4) are
          # built only for a specific version of Python and will fail with cryptic error messages.
          # In the end this means: Don't set the PYTHONPATH permanently if you use different Python versions.
          exit(f'Your PYTHONPATH points to a site-packages dir for Python #{version.major_minor} '
               f'but you are running Python {sys.version_info[0]}.{sys.version_info[1]}!\\n'
               f'     PYTHONPATH is currently: "{os.environ["PYTHONPATH"]}"\\n'
               f'     You should `unset PYTHONPATH` to fix this.')
      # Only do this for a brewed python:
      if os.path.realpath(sys.executable).startswith('#{rack}'):
          # Shuffle /Library site-packages to the end of sys.path
          library_site = '/Library/Python/#{version.major_minor}/site-packages'
          library_packages = [p for p in sys.path if p.startswith(library_site)]
          sys.path = [p for p in sys.path if not p.startswith(library_site)]
          # .pth files have already been processed so don't use addsitedir
          sys.path.extend(library_packages)
          # the Cellar site-packages is a symlink to the HOMEBREW_PREFIX
          # site_packages; prefer the shorter paths
          long_prefix = re.compile(r'#{rack}/[0-9\\._abrc]+/(?:Frameworks/Python\\.framework/Versions/#{version.major_minor}/)?lib/python#{version.major_minor}/site-packages')
          sys.path = [long_prefix.sub('#{site_packages}', p) for p in sys.path]
          # Set the sys.executable to use the opt_prefix. Only do this if PYTHONEXECUTABLE is not
          # explicitly set and we are not in a virtualenv:
          if 'PYTHONEXECUTABLE' not in os.environ and sys.prefix == sys.base_prefix:
              sys.executable = sys._base_executable = '#{opt_bin}/python#{version.major_minor}'
      if 'PYTHONHOME' not in os.environ:
          cellar_prefix = re.compile(r'#{rack}/[0-9\\._abrc]+(?=/|$)')
          if os.path.realpath(sys.base_prefix).startswith('#{rack}'):
              new_prefix = cellar_prefix.sub('#{opt_prefix}', sys.base_prefix)
              site.PREFIXES[:] = [new_prefix if x == sys.base_prefix else x for x in site.PREFIXES]
              if sys.prefix == sys.base_prefix:
                  sys.prefix = new_prefix
              sys.base_prefix = new_prefix
          if os.path.realpath(sys.base_exec_prefix).startswith('#{rack}'):
              new_exec_prefix = cellar_prefix.sub('#{opt_prefix}', sys.base_exec_prefix)
              site.PREFIXES[:] = [new_exec_prefix if x == sys.base_exec_prefix else x for x in site.PREFIXES]
              if sys.exec_prefix == sys.base_exec_prefix:
                  sys.exec_prefix = new_exec_prefix
              sys.base_exec_prefix = new_exec_prefix
      # Make site.getsitepackages() return the HOMEBREW_PREFIX site-packages,
      # but only if we are outside a venv or in one with include-system-site-packages.
      if sys.base_prefix in site.PREFIXES:
          site.PREFIXES.insert(site.PREFIXES.index(sys.base_prefix), '#{HOMEBREW_PREFIX}')
          site.addsitedir('#{site_packages}')
      # Check for and add the prefix of split Python formulae.
      for split_module in ["tk", "gdbm"]:
          split_prefix = f"#{HOMEBREW_PREFIX}/opt/python-{split_module}@#{version.major_minor}/libexec"
          if os.path.isdir(split_prefix):
              sys.path.append(split_prefix)
    PYTHON
  end

  def caveats
    dbm_is = "`dbm.gnu` is"
    on_linux do
      dbm_is = "`dbm.gnu` and `dbm.ndbm` are"
    end

    <<~EOS
      Python is installed as
        #{HOMEBREW_PREFIX}/bin/python#{version.major_minor}

      Unversioned and major-versioned symlinks `python`, `python3`, `python-config`, `python3-config`, `pip`, `pip3`, etc. pointing to
      `python#{version.major_minor}`, `python#{version.major_minor}-config`, `pip#{version.major_minor}` etc., respectively, are installed into
        #{opt_libexec}/bin

      If you do not need a specific version of Python, and always want Homebrew's `python3` in your PATH:
        brew install python3

      `idle#{version.major_minor}` requires tkinter, which is available separately:
        brew install python-tk@#{version.major_minor}

      #{dbm_is} available separately:
        brew install python-gdbm@#{version.major_minor}

      For more information about Homebrew and Python, see: https://docs.brew.sh/Homebrew-and-Python
    EOS
  end

  test do
    # Check if sqlite is ok, because we build with --enable-loadable-sqlite-extensions
    # and it can occur that building sqlite silently fails if OSX's sqlite is used.
    system python3, "-c", "import sqlite3"

    # check to see if we can create a venv
    system python3, "-m", "venv", testpath/"myvenv"

    # Check if some other modules import. Then the linked libs are working.
    system python3, "-c", "import _ctypes"
    system python3, "-c", "import _decimal"
    system python3, "-c", "import pyexpat"
    system python3, "-c", "import readline"
    system python3, "-c", "import zlib"

    # tkinter is provided in a separate formula
    assert_match "ModuleNotFoundError: No module named '_tkinter'",
                 shell_output("#{python3} -Sc 'import tkinter' 2>&1", 1)

    # gdbm is provided in a separate formula
    assert_match "ModuleNotFoundError: No module named '_gdbm'",
                 shell_output("#{python3} -Sc 'import _gdbm' 2>&1", 1)
    assert_match "ModuleNotFoundError: No module named '_gdbm'",
                 shell_output("#{python3} -Sc 'import dbm.gnu' 2>&1", 1)

    # Verify that the selected DBM interface works on macOS.
    # Linux requires installing python-gdbm formula
    (testpath/"dbm_test.py").write <<~PYTHON
      import dbm

      with dbm.ndbm.open("test", "c") as db:
          db[b"foo \\xbd"] = b"bar \\xbd"
      with dbm.ndbm.open("test", "r") as db:
          assert list(db.keys()) == [b"foo \\xbd"]
          assert b"foo \\xbd" in db
          assert db[b"foo \\xbd"] == b"bar \\xbd"
    PYTHON
    system python3, "dbm_test.py" if OS.mac?

    system bin/"pip#{version.major_minor}", "list", "--format=columns"

    # Check our sitecustomize.py
    assert_match HOMEBREW_CELLAR.to_s, shell_output("#{python3} -Sc 'import sys; print(sys.base_prefix)'")
    refute_match HOMEBREW_CELLAR.to_s, shell_output("#{python3} -c 'import sys; print(sys.base_prefix)'")
    refute_match site_packages_cellar.to_s, shell_output("#{python3} -c 'import sys; print(sys.path)'")

    # Verify our sysconfig patches
    sysconfig_path = "import sysconfig; print(sysconfig.get_paths(\"osx_framework_library\")[\"data\"])"
    assert_equal HOMEBREW_PREFIX.to_s, shell_output("#{python3} -c '#{sysconfig_path}'").strip
    linkforshared_var = "import sysconfig; print(sysconfig.get_config_var(\"LINKFORSHARED\"))"
    assert_match opt_prefix.to_s, shell_output("#{python3} -c '#{linkforshared_var}'") if OS.mac?

    # Check our externally managed marker
    assert_match "If you wish to install a Python library",
                 shell_output("#{python3} -m pip install pip 2>&1", 1)
  end
end