Example of PKGBUILD with pip

PKGBUILD

pkgname=frescobaldi
pkgver=2.0.16
pkgrel=1
pkgdesc="A LilyPond sheet music editor for KDE4. It aims to be powerful, yet lightweight and easy to use."
arch=('x86_64')
url="http://www.frescobaldi.org/"
license=("GPL")
depends=('lilypond' 'python2-pip' 'pyqt' 'poppler-qt')
_pythondep='python-poppler-qt4'
optdepends=('lilypond-doc')
makedepends=('automoc4' 'cmake' 'docbook-xsl')
install=$pkgname.install
source=(https://github.com/wbsoft/${pkgname}/releases/download/v${pkgver}/${pkgname}-${pkgver}.tar.gz)
md5sums=('5ff5573fbc817561724a598953449265')

build() {
  pip2 show ${_pythondep}  2>/dev/null || sudo pip2 install ${_pythondep}
  cd "$srcdir/$pkgname-$pkgver"
  python2 setup.py build
}

package() {
  cd "$srcdir/$pkgname-$pkgver"
  python2 setup.py install --root="$pkgdir/" --optimize=1
  find "$pkgdir" -name '*.py' -exec sed -i -e 's/^#!\/usr\/bin\/env python$/#!\/usr\/bin\/env python2/' -e 's/^#!\/usr\/bin\/python$/#!\/usr\/bin\/python2/' {} \;
}