pypy: Reword caveats.

$(brew --prefix)/share/pypy should be added to PATH but
after homebrew's main bin.

Formula/pypy.rb

@@ -60,9 +60,10 @@ class Pypy < Formula
     specifing the install-scripts folder as:
       #{scripts_folder}
 
-    If you install Python packages via "pypy setup.py install", easy_install, pip,
-    any provided scripts will go into the install-scripts folder above, so you may
-    want to add it to your PATH.
+    If you install Python packages via "pypy setup.py install", easy_install_pypy,
+    pip_pypy, any provided scripts will go into the install-scripts folder above,
+    so you may want to add it to your PATH *after* the `$(brew --prefix)/bin`
+    so you don't overwrite tools from CPython.
 
     Setuptools has been installed, so easy_install is available.
     To update setuptools itself outside of Homebrew:

Formula/pyqt5.rb

@@ -0,0 +1,66 @@
+require 'formula'
+
+class Pyqt5 < Formula
+  homepage 'http://www.riverbankcomputing.co.uk/software/pyqt/download5'
+  url 'http://downloads.sf.net/project/pyqt/PyQt5/PyQt-5.0/PyQt-gpl-5.0.tar.gz'
+  sha1 'todo'
+
+  depends_on :python3 => :recommended
+  depends_on :python2 => :optional
+
+  depends_on 'qt5'
+
+  if build.with? 'python3'
+    depends_on 'sip' => 'with-python3'
+  else
+    depends_on 'sip'
+  end
+
+  def install
+    python do
+      system python, "./configure.py", "--confirm-license",
+                                       "--bindir=#{bin}#{python.if3then3}",
+                                       "--destdir=#{lib}/#{python.xy}/site-packages",
+                                       "--sipdir=#{share}/sip#{python.if3then3}"
+      system "make"
+      system "make", "install"
+      system "make", "clean"  # because this python block may be run twice
+    end
+
+    if python3
+      # These tools need a unique suffix for python3.
+      ['pyuic5', 'pyrcc5', 'pylupdate5'].each { |f| mv(prefix/"bin3/#{f}", bin/"#{f}-py3")}
+      rm_rf prefix/'bin3'
+    end
+  end
+
+  def caveats
+    python.standard_caveats if python
+  end
+
+  test do
+    python do
+      # Reference: http://zetcode.com/tutorials/pyqt4/firstprograms/
+      (testpath/'test.py').write <<-EOS.undent
+        import sys
+        from PyQt5 import QtGui, QtCore
+
+        class Test(QtGui.QWidget):
+            def __init__(self, parent=None):
+                QtGui.QWidget.__init__(self, parent)
+                self.setGeometry(300, 300, 400, 150)
+                self.setWindowTitle('Homebrew')
+                QtGui.QLabel("Python #{python.version} working with PyQt4. Quitting now...", self).move(50, 50)
+                QtCore.QTimer.singleShot(2500, QtGui.qApp, QtCore.SLOT('quit()'))
+
+        app = QtGui.QApplication([])
+        window = Test()
+        window.show()
+        sys.exit(app.exec_())
+        EOS
+
+      system python, "test.py"
+      rm testpath/'test.py'
+    end
+  end
+end