MacOS homebrew python 3.8.3 with tcl-tk (properly)

python-with-tcl.rb

class Python < Formula
  desc "Interpreted, interactive, object-oriented programming language"
  homepage "https://www.python.org/"
  url "https://www.python.org/ftp/python/3.8.3/Python-3.8.3.tar.xz"
  sha256 "dfab5ec723c218082fe3d5d7ae17ecbdebffa9a1aea4d64aa3a2ecdd2e795864"
  head "https://github.com/python/cpython.git"

  bottle do
    sha256 "25e0099852136c4ef1efd221247d0f67aa71f7b624211b98898f8b46c612f40d" => :mojave
    sha256 "b65fecb4bb8350359488d6ca4c0a5a343f658f424d101a45e28d5a72de7f455c" => :high_sierra
    sha256 "b07ec3a40f58fa317e1bb937992dc0dca7d60812c60de99bde14fbadb6c27cc5" => :sierra
  end

  # setuptools remembers the build flags python is built with and uses them to
  # build packages later. Xcode-only systems need different flags.
  pour_bottle? do
    reason <<~EOS
      The bottle needs the Apple Command Line Tools to be installed.
        You can install them, if desired, with:
          xcode-select --install
    EOS
    satisfy { MacOS::CLT.installed? }
  end

  depends_on "pkg-config" => :build
  depends_on "gdbm"
  depends_on "openssl@1.1"
  depends_on "readline"
  depends_on "sqlite"
  depends_on "xz"
  depends_on "tcl-tk"  # as apple's one is shiiiiite

  skip_clean "bin/pip3", "bin/pip-3.4", "bin/pip-3.5", "bin/pip-3.6", "bin/pip-3.7", "bin/pip-3.8"
  skip_clean "bin/easy_install3", "bin/easy_install-3.4", "bin/easy_install-3.5", "bin/easy_install-3.6", "bin/easy_install-3.7", "bin/easy_install-3.8"

  resource "setuptools" do
    url "https://files.pythonhosted.org/packages/b5/96/af1686ea8c1e503f4a81223d4a3410e7587fd52df03083de24161d0df7d4/setuptools-46.1.3.zip"
    sha256 "795e0475ba6cd7fa082b1ee6e90d552209995627a2a227a47c6ea93282f4bfb1"
  end

  resource "pip" do
    url "https://files.pythonhosted.org/packages/8e/76/66066b7bc71817238924c7e4b448abdb17eb0c92d645769c223f9ace478f/pip-20.0.2.tar.gz"
    sha256 "7db0c8ea4c7ea51c8049640e8e6e7fde949de672bfa4949920675563a5a6967f"
  end

  resource "wheel" do
    url "https://files.pythonhosted.org/packages/75/28/521c6dc7fef23a68368efefdcd682f5b3d1d58c2b90b06dc1d0b805b51ae/wheel-0.34.2.tar.gz"
    sha256 "8788e9155fe14f54164c1b9eb0a319d98ef02c160725587ad60f14ddc57b6f96"
  end

  # Homebrew's tcl-tk is built in a standard unix fashion (due to link errors)
  # so we have to stop python from searching for frameworks and linking against
  # X11.
  patch :DATA

  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

    xy = (buildpath/"configure.ac").read.slice(/PYTHON_VERSION, (3\.\d)/, 1)
    lib_cellar = prefix/"Frameworks/Python.framework/Versions/#{xy}/lib/python#{xy}"

    args = %W[
      --prefix=#{prefix}
      --enable-ipv6
      --datarootdir=#{share}
      --datadir=#{share}
      --enable-framework=#{frameworks}
      --enable-loadable-sqlite-extensions
      --without-ensurepip
      --with-dtrace
      --with-openssl=#{Formula["openssl@1.1"].opt_prefix}
    ]

    # args << "--without-gcc" if ENV.compiler == :clang

    cflags   = []
    ldflags  = []
    cppflags = []

    if MacOS.sdk_path_if_needed
      # Help Python's build system (setuptools/pip) to build things on SDK-based systems
      # The setup.py looks at "-isysroot" to get the sysroot (and not at --sysroot)
      cflags  << "-isysroot #{MacOS.sdk_path}" << "-I#{MacOS.sdk_path}/usr/include"
      ldflags << "-isysroot #{MacOS.sdk_path}"
      # For the Xlib.h, Python needs this header dir with the system Tk
      # Yep, this needs the absolute path where zlib needed a path relative
      # to the SDK.
      # as external tck is added later on uncomment this
      # cflags << "-I#{MacOS.sdk_path}/System/Library/Frameworks/Tk.framework/Versions/8.5/Headers"
    end
    # Avoid linking to libgcc https://mail.python.org/pipermail/python-dev/2012-February/116205.html
    args << "MACOSX_DEPLOYMENT_TARGET=#{MacOS.version}"

    # We want our readline! This is just to outsmart the detection code,
    # superenv makes cc always find includes/libs!
    inreplace "setup.py",
      "do_readline = self.compiler.find_library_file(self.lib_dirs, 'readline')",
      "do_readline = '#{Formula["readline"].opt_lib}/libhistory.dylib'"

    inreplace "setup.py" do |s|
      s.gsub! "sqlite_setup_debug = False", "sqlite_setup_debug = True"
      s.gsub! "for d_ in self.inc_dirs + sqlite_inc_paths:",
              "for d_ in ['#{Formula["sqlite"].opt_include}']:"
    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',"
      f.gsub! "DEFAULT_FRAMEWORK_FALLBACK = [", "DEFAULT_FRAMEWORK_FALLBACK = [ '#{HOMEBREW_PREFIX}/Frameworks',"
    end

    # ADD tcl-tk include / lib paths
    tcl_tk = Formula["tcl-tk"].opt_prefix
    cppflags << "-I#{tcl_tk}/include"
    ldflags  << "-L#{tcl_tk}/lib"

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

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

    ENV.deparallelize do
      # Tell Python not to install into /Applications (default for framework builds)
      system "make", "install", "PYTHONAPPSDIR=#{prefix}"
      system "make", "frameworkinstallextras", "PYTHONAPPSDIR=#{pkgshare}"
    end

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

    # Prevent third-party packages from building against fragile Cellar paths
    inreplace Dir[lib_cellar/"**/_sysconfigdata__darwin_darwin.py",
                  lib_cellar/"config*/Makefile",
                  frameworks/"Python.framework/Versions/3*/lib/pkgconfig/python-3.?.pc"],
              prefix, opt_prefix

    # Help third-party packages find the Python framework
    inreplace Dir[lib_cellar/"config*/Makefile"],
              /^LINKFORSHARED=(.*)PYTHONFRAMEWORKDIR(.*)/,
              "LINKFORSHARED=\\1PYTHONFRAMEWORKINSTALLDIR\\2"

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

    # A fix, because python and python3 both want to install Python.framework
    # and therefore we can't link both into HOMEBREW_PREFIX/Frameworks
    # https://github.com/Homebrew/homebrew/issues/15943
    ["Headers", "Python", "Resources"].each { |f| rm(prefix/"Frameworks/Python.framework/#{f}") }
    rm prefix/"Frameworks/Python.framework/Versions/Current"

    # Symlink the pkgconfig files into HOMEBREW_PREFIX so they're accessible.
    (lib/"pkgconfig").install_symlink Dir["#{frameworks}/Python.framework/Versions/#{xy}/lib/pkgconfig/*"]

    # Remove the site-packages that Python created in its Cellar.
    (prefix/"Frameworks/Python.framework/Versions/#{xy}/lib/python#{xy}/site-packages").rmtree

    %w[setuptools pip wheel].each do |r|
      (libexec/r).install resource(r)
    end

    # Install unversioned symlinks in libexec/bin.
    {
      "idle"          => "idle3",
      "pydoc"         => "pydoc3",
      "python"        => "python3",
      "python-config" => "python3-config",
    }.each do |unversioned_name, versioned_name|
      (libexec/"bin").install_symlink (bin/versioned_name).realpath => unversioned_name
    end
  end

  def post_install
    ENV.delete "PYTHONPATH"

    xy = (prefix/"Frameworks/Python.framework/Versions").children.min.basename.to_s
    site_packages = HOMEBREW_PREFIX/"lib/python#{xy}/site-packages"
    site_packages_cellar = prefix/"Frameworks/Python.framework/Versions/#{xy}/lib/python#{xy}/site-packages"

    # Fix up the site-packages so that user-installed Python software survives
    # minor updates, such as going from 3.3.2 to 3.3.3:

    # Create a site-packages in HOMEBREW_PREFIX/lib/python#{xy}/site-packages
    site_packages.mkpath

    # Symlink the prefix site-packages into the cellar.
    site_packages_cellar.unlink if site_packages_cellar.exist?
    site_packages_cellar.parent.install_symlink site_packages

    # Write our sitecustomize.py
    rm_rf Dir["#{site_packages}/sitecustomize.py[co]"]
    (site_packages/"sitecustomize.py").atomic_write(sitecustomize)

    # Remove old setuptools installations that may still fly around and be
    # listed in the easy_install.pth. This can break setuptools build with
    # zipimport.ZipImportError: bad local file header
    # setuptools-0.9.8-py3.3.egg
    rm_rf Dir["#{site_packages}/setuptools*"]
    rm_rf Dir["#{site_packages}/distribute*"]
    rm_rf Dir["#{site_packages}/pip[-_.][0-9]*", "#{site_packages}/pip"]

    %w[setuptools pip wheel].each do |pkg|
      (libexec/pkg).cd do
        system bin/"python3", "-s", "setup.py", "--no-user-cfg", "install",
               "--force", "--verbose", "--install-scripts=#{bin}",
               "--install-lib=#{site_packages}",
               "--single-version-externally-managed",
               "--record=installed.txt"
      end
    end

    rm_rf [bin/"pip", bin/"easy_install"]
    mv bin/"wheel", bin/"wheel3"

    # Install unversioned symlinks in libexec/bin.
    {
      "easy_install" => "easy_install-#{xy}",
      "pip"          => "pip3",
      "wheel"        => "wheel3",
    }.each do |unversioned_name, versioned_name|
      (libexec/"bin").install_symlink (bin/versioned_name).realpath => unversioned_name
    end

    # post_install happens after link
    %W[pip3 pip#{xy} easy_install-#{xy} wheel3].each do |e|
      (HOMEBREW_PREFIX/"bin").install_symlink bin/e
    end

    # Help distutils find brewed stuff when building extensions
    include_dirs = [HOMEBREW_PREFIX/"include", Formula["openssl@1.1"].opt_include,
                    Formula["sqlite"].opt_include]
    library_dirs = [HOMEBREW_PREFIX/"lib", Formula["openssl@1.1"].opt_lib,
                    Formula["sqlite"].opt_lib]

    # Again tcl-tk
    include_dirs << Formula["tcl-tk"].opt_include
    library_dirs << Formula["tcl-tk"].opt_lib


    cfg = prefix/"Frameworks/Python.framework/Versions/#{xy}/lib/python#{xy}/distutils/distutils.cfg"

    cfg.atomic_write <<~EOS
      [install]
      prefix=#{HOMEBREW_PREFIX}

      [build_ext]
      include_dirs=#{include_dirs.join ":"}
      library_dirs=#{library_dirs.join ":"}
    EOS
  end

  def sitecustomize
    xy = (prefix/"Frameworks/Python.framework/Versions").children.min.basename.to_s

    <<~EOS
      # 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 sys

      if sys.version_info[0] != 3:
          # This can only happen if the user has set the PYTHONPATH for 3.x and run Python 2.x or vice versa.
          # 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('Your PYTHONPATH points to a site-packages dir for Python 3.x but you are running Python ' +
               str(sys.version_info[0]) + '.x!\\n     PYTHONPATH is currently: "' + str(os.environ['PYTHONPATH']) + '"\\n' +
               '     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/#{xy}/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/#{xy}/lib/python#{xy}/site-packages')
          sys.path = [long_prefix.sub('#{HOMEBREW_PREFIX/"lib/python#{xy}/site-packages"}', p) for p in sys.path]

          # Set the sys.executable to use the opt_prefix, unless explicitly set
          # with PYTHONEXECUTABLE:
          if 'PYTHONEXECUTABLE' not in os.environ:
              sys.executable = '#{opt_bin}/python#{xy}'
    EOS
  end

  def caveats
    if prefix.exist?
      xy = (prefix/"Frameworks/Python.framework/Versions").children.min.basename.to_s
    else
      xy = version.to_s.slice(/(3\.\d)/) || "3.8"
    end
    <<~EOS
      Python has been installed as
        #{HOMEBREW_PREFIX}/bin/python3

      Unversioned symlinks `python`, `python-config`, `pip` etc. pointing to
      `python3`, `python3-config`, `pip3` etc., respectively, have been installed into
        #{opt_libexec}/bin

      If you need Homebrew's Python 2.7 run
        brew install python@2

      You can install Python packages with
        pip3 install <package>
      They will install into the site-package directory
        #{HOMEBREW_PREFIX/"lib/python#{xy}/site-packages"}

      See: https://docs.brew.sh/Homebrew-and-Python
    EOS
  end

  test do
    xy = (prefix/"Frameworks/Python.framework/Versions").children.min.basename.to_s
    # 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 "#{bin}/python#{xy}", "-c", "import sqlite3"
    # Check if some other modules import. Then the linked libs are working.
    system "#{bin}/python#{xy}", "-c", "import tkinter; root = tkinter.Tk()"
    system "#{bin}/python#{xy}", "-c", "import _gdbm"
    system "#{bin}/python#{xy}", "-c", "import zlib"
    system bin/"pip3", "list", "--format=columns"
  end
end

__END__
diff --git a/setup.py b/setup.py
index 20d7f35..b9616d3 100644
--- a/setup.py
+++ b/setup.py
@@ -1851,8 +1851,6 @@ class PyBuildExt(build_ext):
         # Rather than complicate the code below, detecting and building
         # AquaTk is a separate method. Only one Tkinter will be built on
         # Darwin - either AquaTk, if it is found, or X11 based Tk.
-        if (MACOS and self.detect_tkinter_darwin()):
-            return True
 
         # Assume we haven't found any of the libraries or include files
         # The versions with dots are used on Unix, and the versions without
@@ -1901,21 +1899,6 @@ class PyBuildExt(build_ext):
             if dir not in include_dirs:
                 include_dirs.append(dir)
 
-        # Check for various platform-specific directories
-        if HOST_PLATFORM == 'sunos5':
-            include_dirs.append('/usr/openwin/include')
-            added_lib_dirs.append('/usr/openwin/lib')
-        elif os.path.exists('/usr/X11R6/include'):
-            include_dirs.append('/usr/X11R6/include')
-            added_lib_dirs.append('/usr/X11R6/lib64')
-            added_lib_dirs.append('/usr/X11R6/lib')
-        elif os.path.exists('/usr/X11R5/include'):
-            include_dirs.append('/usr/X11R5/include')
-            added_lib_dirs.append('/usr/X11R5/lib')
-        else:
-            # Assume default location for X11
-            include_dirs.append('/usr/X11/include')
-            added_lib_dirs.append('/usr/X11/lib')
 
         # If Cygwin, then verify that X is installed before proceeding
         if CYGWIN:
@@ -1937,9 +1920,6 @@ class PyBuildExt(build_ext):
         libs.append('tk'+ version)
         libs.append('tcl'+ version)
 
-        # Finally, link with the X11 libraries (not appropriate on cygwin)
-        if not CYGWIN:
-            libs.append('X11')
 
         # XXX handle these, but how to detect?
         # *** Uncomment and edit for PIL (TkImaging) extension only:

instructions

1. xcode-select --install
2. brew update
3. FRMPTH="/usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/python.rb"; rm $FRMPTH; wget -O $FRMPTH https://gist.github.com/dhinakg/c4f0acebafc27c93dc40f2054d8a63a4/raw/python-with-tcl.rb
4. HOMEBREW_NO_AUTO_UPDATE=1 brew install --build-from-source python

Credit @iexa for the original.