text: """
  AppVeyor will at least have few Pythons around so there's no point of implementing a bootstrapper in PowerShell.
  
  This is a port of https://github.com/pypa/python-packaging-user-guide/blob/master/source/code/install.ps1
  with various fixes and improvements that just weren't feasible to implement in PowerShell.
  """
  from __future__ import print_function
  from os import environ
  from os.path import exists
  from subprocess import check_call
  
  try:
      from urllib.request import urlretrieve
  except ImportError:
      from urllib import urlretrieve
  
  BASE_URL = "https://www.python.org/ftp/python/"
  GET_PIP_URL = "https://bootstrap.pypa.io/get-pip.py"
  GET_PIP_PATH = "C:\get-pip.py"
  URLS = {
      ("2.7", "64"): BASE_URL + "2.7.13/python-2.7.13.amd64.msi",
      ("2.7", "32"): BASE_URL + "2.7.13/python-2.7.13.msi",
      # NOTE: no .msi installer for 3.3.6
      ("3.4", "64"): BASE_URL + "3.4.4/python-3.4.4.amd64.msi",
      ("3.4", "32"): BASE_URL + "3.4.4/python-3.4.4.msi",
      ("3.5", "64"): BASE_URL + "3.5.4/python-3.5.4-amd64.exe",
      ("3.5", "32"): BASE_URL + "3.5.4/python-3.5.4.exe",
      ("3.6", "64"): BASE_URL + "3.6.2/python-3.6.2-amd64.exe",
      ("3.6", "32"): BASE_URL + "3.6.2/python-3.6.2.exe",
  }
  INSTALL_CMD = {
      # Commands are allowed to fail only if they are not the last command.  Eg: uninstall (/x) allowed to fail.
      "2.7": [["msiexec.exe", "/L*+!", "install.log", "/qn", "/x", "{path}"],
              ["msiexec.exe", "/L*+!", "install.log", "/qn", "/i", "{path}", "TARGETDIR={home}"]],
      "3.4": [["msiexec.exe", "/L*+!", "install.log", "/qn", "/x", "{path}"],
              ["msiexec.exe", "/L*+!", "install.log", "/qn", "/i", "{path}", "TARGETDIR={home}"]],
      "3.5": [["{path}", "/quiet", "TargetDir={home}"]],
      "3.6": [["{path}", "/quiet", "TargetDir={home}"]],
  }
  
  
  def download_file(url, path):
      print("Downloading: {} (into {})".format(url, path))
      progress = [0, 0]
  
      def report(count, size, total):
          progress[0] = count * size
          if progress[0] - progress[1] > 1000000:
              progress[1] = progress[0]
              print("Downloaded {:,}/{:,} ...".format(progress[1], total))
  
      dest, _ = urlretrieve(url, path, reporthook=report)
      return dest
  
  
  def install_python(version, arch, home):
      print("Installing Python", version, "for", arch, "bit architecture to", home)
      if exists(home):
          return
  
      path = download_python(version, arch)
      print("Installing", path, "to", home)
      success = False
      for cmd in INSTALL_CMD[version]:
          cmd = [part.format(home=home, path=path) for part in cmd]
          print("Running:", " ".join(cmd))
          try:
              check_call(cmd)
          except Exception as exc:
              print("Failed command", cmd, "with:", exc)
              if exists("install.log"):
                  with open("install.log") as fh:
                      print(fh.read())
          else:
              success = True
      if success:
          print("Installation complete!")
      else:
          print("Installation failed")
  
  
  def download_python(version, arch):
      for _ in range(3):
          try:
              return download_file(URLS[version, arch], "installer.exe")
          except Exception as exc:
              print("Failed to download:", exc)
          print("Retrying ...")
  
  
  def install_pip(home):
      pip_path = home + "/Scripts/pip.exe"
      python_path = home + "/python.exe"
      if exists(pip_path):
          print("pip already installed.")
      else:
          print("Installing pip...")
          download_file(GET_PIP_URL, GET_PIP_PATH)
          print("Executing:", python_path, GET_PIP_PATH)
          check_call([python_path, GET_PIP_PATH])
  
  
  def install_packages(home, *packages):
      cmd = [home + "/Scripts/pip.exe", "install"]
      cmd.extend(packages)
      check_call(cmd)
  
  
  if __name__ == "__main__":
      install_python(environ['PYTHON_VERSION'], environ['PYTHON_ARCH'], environ['PYTHON_HOME'])
      install_pip(environ['PYTHON_HOME'])
      install_packages(environ['PYTHON_HOME'], "setuptools>=18.0.1", "wheel", "tox", "virtualenv>=13.1.0")
  