text: """
  pip._vendor is for vendoring dependencies of pip to prevent needing pip to
  depend on something external.
  
  Files inside of pip._vendor should be considered immutable and should only be
  updated to versions from upstream.
  """
  from __future__ import absolute_import
  
  import glob
  import os.path
  import sys
  
  # Downstream redistributors which have debundled our dependencies should also
  # patch this value to be true. This will trigger the additional patching
  # to cause things like "six" to be available as pip.
  DEBUNDLED = False
  
  # By default, look in this directory for a bunch of .whl files which we will
  # add to the beginning of sys.path before attempting to import anything. This
  # is done to support downstream re-distributors like Debian and Fedora who
  # wish to create their own Wheels for our dependencies to aid in debundling.
  WHEEL_DIR = os.path.abspath(os.path.dirname(__file__))
  
  
  # Define a small helper function to alias our vendored modules to the real ones
  # if the vendored ones do not exist. This idea of this was taken from
  # https://github.com/kennethreitz/requests/pull/2567.
  def vendored(modulename):
      vendored_name = "{0}.{1}".format(__name__, modulename)
  
      try:
          __import__(modulename, globals(), locals(), level=0)
      except ImportError:
          # We can just silently allow import failures to pass here. If we
          # got to this point it means that ``import pip._vendor.whatever``
          # failed and so did ``import whatever``. Since we're importing this
          # upfront in an attempt to alias imports, not erroring here will
          # just mean we get a regular import error whenever pip *actually*
          # tries to import one of these modules to use it, which actually
          # gives us a better error message than we would have otherwise
          # gotten.
          pass
      else:
          sys.modules[vendored_name] = sys.modules[modulename]
          base, head = vendored_name.rsplit(".", 1)
          setattr(sys.modules[base], head, sys.modules[modulename])
  
  
  # If we're operating in a debundled setup, then we want to go ahead and trigger
  # the aliasing of our vendored libraries as well as looking for wheels to add
  # to our sys.path. This will cause all of this code to be a no-op typically
  # however downstream redistributors can enable it in a consistent way across
  # all platforms.
  if DEBUNDLED:
      # Actually look inside of WHEEL_DIR to find .whl files and add them to the
      # front of our sys.path.
      sys.path[:] = glob.glob(os.path.join(WHEEL_DIR, "*.whl")) + sys.path
  
      # Actually alias all of our vendored dependencies.
      vendored("appdirs")
      vendored("cachecontrol")
      vendored("certifi")
      vendored("colorama")
      vendored("distlib")
      vendored("distro")
      vendored("html5lib")
      vendored("six")
      vendored("six.moves")
      vendored("six.moves.urllib")
      vendored("six.moves.urllib.parse")
      vendored("packaging")
      vendored("packaging.version")
      vendored("packaging.specifiers")
      vendored("pep517")
      vendored("pkg_resources")
      vendored("progress")
      vendored("requests")
      vendored("requests.exceptions")
      vendored("requests.packages")
      vendored("requests.packages.urllib3")
      vendored("requests.packages.urllib3._collections")
      vendored("requests.packages.urllib3.connection")
      vendored("requests.packages.urllib3.connectionpool")
      vendored("requests.packages.urllib3.contrib")
      vendored("requests.packages.urllib3.contrib.ntlmpool")
      vendored("requests.packages.urllib3.contrib.pyopenssl")
      vendored("requests.packages.urllib3.exceptions")
      vendored("requests.packages.urllib3.fields")
      vendored("requests.packages.urllib3.filepost")
      vendored("requests.packages.urllib3.packages")
      vendored("requests.packages.urllib3.packages.ordered_dict")
      vendored("requests.packages.urllib3.packages.six")
      vendored("requests.packages.urllib3.packages.ssl_match_hostname")
      vendored("requests.packages.urllib3.packages.ssl_match_hostname."
               "_implementation")
      vendored("requests.packages.urllib3.poolmanager")
      vendored("requests.packages.urllib3.request")
      vendored("requests.packages.urllib3.response")
      vendored("requests.packages.urllib3.util")
      vendored("requests.packages.urllib3.util.connection")
      vendored("requests.packages.urllib3.util.request")
      vendored("requests.packages.urllib3.util.response")
      vendored("requests.packages.urllib3.util.retry")
      vendored("requests.packages.urllib3.util.ssl_")
      vendored("requests.packages.urllib3.util.timeout")
      vendored("requests.packages.urllib3.util.url")
      vendored("resolvelib")
      vendored("tenacity")
      vendored("tomli")
      vendored("urllib3")
  