text: import os
  import os.path
  import pkgutil
  import sys
  import runpy
  import tempfile
  
  
  __all__ = ["version", "bootstrap"]
  
  
  _SETUPTOOLS_VERSION = "41.2.0"
  
  _PIP_VERSION = "19.2.3"
  
  _PROJECTS = [
      ("setuptools", _SETUPTOOLS_VERSION),
      ("pip", _PIP_VERSION),
  ]
  
  
  def _run_pip(args, additional_paths=None):
      # Add our bundled software to the sys.path so we can import it
      if additional_paths is not None:
          sys.path = additional_paths + sys.path
  
      # Invoke pip as if it's the main module, and catch the exit.
      backup_argv = sys.argv[:]
      sys.argv[1:] = args
      try:
          # run_module() alters sys.modules and sys.argv, but restores them at exit
          runpy.run_module("pip", run_name="__main__", alter_sys=True)
      except SystemExit as exc:
          return exc.code
      finally:
          sys.argv[:] = backup_argv
  
      raise SystemError("pip did not exit, this should never happen")
  
  
  def version():
      """
      Returns a string specifying the bundled version of pip.
      """
      return _PIP_VERSION
  
  def _disable_pip_configuration_settings():
      # We deliberately ignore all pip environment variables
      # when invoking pip
      # See http://bugs.python.org/issue19734 for details
      keys_to_remove = [k for k in os.environ if k.startswith("PIP_")]
      for k in keys_to_remove:
          del os.environ[k]
      # We also ignore the settings in the default pip configuration file
      # See http://bugs.python.org/issue20053 for details
      os.environ['PIP_CONFIG_FILE'] = os.devnull
  
  
  def bootstrap(*, root=None, upgrade=False, user=False,
                altinstall=False, default_pip=False,
                verbosity=0):
      """
      Bootstrap pip into the current Python installation (or the given root
      directory).
  
      Note that calling this function will alter both sys.path and os.environ.
      """
      # Discard the return value
      _bootstrap(root=root, upgrade=upgrade, user=user,
                 altinstall=altinstall, default_pip=default_pip,
                 verbosity=verbosity)
  
  
  def _bootstrap(*, root=None, upgrade=False, user=False,
                altinstall=False, default_pip=False,
                verbosity=0):
      """
      Bootstrap pip into the current Python installation (or the given root
      directory). Returns pip command status code.
  
      Note that calling this function will alter both sys.path and os.environ.
      """
      if altinstall and default_pip:
          raise ValueError("Cannot use altinstall and default_pip together")
  
      sys.audit("ensurepip.bootstrap", root)
  
      _disable_pip_configuration_settings()
  
      # By default, installing pip and setuptools installs all of the
      # following scripts (X.Y == running Python version):
      #
      #   pip, pipX, pipX.Y, easy_install, easy_install-X.Y
      #
      # pip 1.5+ allows ensurepip to request that some of those be left out
      if altinstall:
          # omit pip, pipX and easy_install
          os.environ["ENSUREPIP_OPTIONS"] = "altinstall"
      elif not default_pip:
          # omit pip and easy_install
          os.environ["ENSUREPIP_OPTIONS"] = "install"
  
      with tempfile.TemporaryDirectory() as tmpdir:
          # Put our bundled wheels into a temporary directory and construct the
          # additional paths that need added to sys.path
          additional_paths = []
          for project, version in _PROJECTS:
              wheel_name = "{}-{}-py2.py3-none-any.whl".format(project, version)
              whl = pkgutil.get_data(
                  "ensurepip",
                  "_bundled/{}".format(wheel_name),
              )
              with open(os.path.join(tmpdir, wheel_name), "wb") as fp:
                  fp.write(whl)
  
              additional_paths.append(os.path.join(tmpdir, wheel_name))
  
          # Construct the arguments to be passed to the pip command
          args = ["install", "--no-index", "--find-links", tmpdir]
          if root:
              args += ["--root", root]
          if upgrade:
              args += ["--upgrade"]
          if user:
              args += ["--user"]
          if verbosity:
              args += ["-" + "v" * verbosity]
  
          return _run_pip(args + [p[0] for p in _PROJECTS], additional_paths)
  
  def _uninstall_helper(*, verbosity=0):
      """Helper to support a clean default uninstall process on Windows
  
      Note that calling this function may alter os.environ.
      """
      # Nothing to do if pip was never installed, or has been removed
      try:
          import pip
      except ImportError:
          return
  
      # If the pip version doesn't match the bundled one, leave it alone
      if pip.__version__ != _PIP_VERSION:
          msg = ("ensurepip will only uninstall a matching version "
                 "({!r} installed, {!r} bundled)")
          print(msg.format(pip.__version__, _PIP_VERSION), file=sys.stderr)
          return
  
      _disable_pip_configuration_settings()
  
      # Construct the arguments to be passed to the pip command
      args = ["uninstall", "-y", "--disable-pip-version-check"]
      if verbosity:
          args += ["-" + "v" * verbosity]
  
      return _run_pip(args + [p[0] for p in reversed(_PROJECTS)])
  
  
  def _main(argv=None):
      import argparse
      parser = argparse.ArgumentParser(prog="python -m ensurepip")
      parser.add_argument(
          "--version",
          action="version",
          version="pip {}".format(version()),
          help="Show the version of pip that is bundled with this Python.",
      )
      parser.add_argument(
          "-v", "--verbose",
          action="count",
          default=0,
          dest="verbosity",
          help=("Give more output. Option is additive, and can be used up to 3 "
                "times."),
      )
      parser.add_argument(
          "-U", "--upgrade",
          action="store_true",
          default=False,
          help="Upgrade pip and dependencies, even if already installed.",
      )
      parser.add_argument(
          "--user",
          action="store_true",
          default=False,
          help="Install using the user scheme.",
      )
      parser.add_argument(
          "--root",
          default=None,
          help="Install everything relative to this alternate root directory.",
      )
      parser.add_argument(
          "--altinstall",
          action="store_true",
          default=False,
          help=("Make an alternate install, installing only the X.Y versioned "
                "scripts (Default: pipX, pipX.Y, easy_install-X.Y)."),
      )
      parser.add_argument(
          "--default-pip",
          action="store_true",
          default=False,
          help=("Make a default pip install, installing the unqualified pip "
                "and easy_install in addition to the versioned scripts."),
      )
  
      args = parser.parse_args(argv)
  
      return _bootstrap(
          root=args.root,
          upgrade=args.upgrade,
          user=args.user,
          verbosity=args.verbosity,
          altinstall=args.altinstall,
          default_pip=args.default_pip,
      )
  