new_contents: #!/usr/bin/env python
  
  from evolution_master.runners import pkg, download
  
  # Install for Arch
  with pkg.pacman() as pkg_man:
      pkg_man.install('go')
  
  # Install for Debian & Ubuntu
  with pkg.apt() as pkg_man:
      pkg_man.install('golang')
  
  # Install for OSX
  with pkg.brew() as pkg_man:
      pkg_man.install('go')
  
  # Install for Windows
  with  download.https() as downloader, pkg.msiexec() as installer:
      downloader.get('https://storage.googleapis.com/golang/go1.5.1.windows-amd64.msi')
      downloader.checksum('sha1', '0a439f49b546b82f85adf84a79bbf40de2b3d5ba')
      installer.install_flags('/qn' '/norestart')
      installer.await(downloader.finished())
  
subject: Create main.py