old_contents: from spack import *
  
  class PyScikitLearn(Package):
      """"""
      homepage = "https://pypi.python.org/pypi/scikit-learn"
      url      = "https://pypi.python.org/packages/source/s/scikit-learn/scikit-learn-0.15.2.tar.gz"
  
      version('0.15.2', 'd9822ad0238e17b382a3c756ea94fe0d')
      version('0.16.1', '363ddda501e3b6b61726aa40b8dbdb7e')
  
      extends('python')
  
      def install(self, spec, prefix):
          python('setup.py', 'install', '--prefix=%s' % prefix)
  
new_contents: from spack import *
  
  class PyScikitLearn(Package):
      """"""
      homepage = "https://pypi.python.org/pypi/scikit-learn"
      url      = "https://pypi.python.org/packages/source/s/scikit-learn/scikit-learn-0.15.2.tar.gz"
  
      version('0.15.2', 'd9822ad0238e17b382a3c756ea94fe0d')
      version('0.16.1', '363ddda501e3b6b61726aa40b8dbdb7e')
      version('0.17.1', 'a2f8b877e6d99b1ed737144f5a478dfc')
  
      extends('python')
  
      def install(self, spec, prefix):
          python('setup.py', 'install', '--prefix=%s' % prefix)
  
subject: Add version 0.17.1 of scikit-learn.