old_contents: from pip import __version__ as pip_version
  from pip._vendor.pkg_resources import Requirement, parse_version
  
  PIP_9_OR_NEWER = (parse_version(pip_version) >= parse_version('9.0'))
  PIP_10_OR_NEWER = (parse_version(pip_version) >= parse_version('10.0'))
  
  if PIP_10_OR_NEWER:
      from pip._internal.cache import WheelCache
      from pip._internal.exceptions import InstallationError
      from pip._internal.req.req_install import InstallRequirement
      from pip._internal.req.req_file import parse_requirements
      from pip._internal.req.req_set import RequirementSet
      from pip._internal.utils.appdirs import user_cache_dir
      from pip._internal.utils.hashes import FAVORITE_HASH
      from pip._internal.download import is_file_url, path_to_url, url_to_path
      from pip._internal.index import FormatControl, PackageFinder
      from pip._internal.wheel import Wheel
      from pip._internal.basecommand import Command
      from pip._internal import cmdoptions
      from pip._internal.utils.misc import get_installed_distributions
      from pip._internal.models.index import PyPI
  else:
      from pip.exceptions import InstallationError
      from pip.req.req_install import InstallRequirement
      from pip.req.req_file import parse_requirements
      from pip.req.req_set import RequirementSet
      from pip.utils.appdirs import user_cache_dir
      from pip.utils.hashes import FAVORITE_HASH
      from pip.download import is_file_url, path_to_url, url_to_path
      from pip.index import FormatControl, PackageFinder
      from pip.wheel import Wheel, WheelCache
      from pip.basecommand import Command
      from pip import cmdoptions
      from pip.utils import get_installed_distributions
      from pip.models.index import PyPI
  
  
  __all__ = [
      'Command',
      'FAVORITE_HASH',
      'FormatControl',
      'InstallRequirement',
      'InstallationError',
      'PackageFinder',
      'PyPI',
      'Requirement',
      'RequirementSet',
      'Wheel',
      'WheelCache',
      'cmdoptions',
      'get_installed_distributions',
      'is_file_url',
      'parse_requirements',
      'path_to_url',
      'url_to_path',
      'user_cache_dir',
  ]
  
new_contents: from pip import __version__ as pip_version
  from pip._vendor.pkg_resources import Requirement, parse_version
  
  PIP_9_OR_NEWER = (parse_version(pip_version) >= parse_version('9.0'))
  PIP_10_OR_NEWER = (parse_version(pip_version) >= parse_version('10.0'))
  
  try:
      from pip._internal.cli.base_command import Command
  except ImportError:
      if PIP_10_OR_NEWER:
          from pip._internal.basecommand import Command
      else:
          from pip.basecommand import Command
  
  
  if PIP_10_OR_NEWER:
      from pip._internal.cache import WheelCache
      from pip._internal.exceptions import InstallationError
      from pip._internal.req.req_install import InstallRequirement
      from pip._internal.req.req_file import parse_requirements
      from pip._internal.req.req_set import RequirementSet
      from pip._internal.utils.appdirs import user_cache_dir
      from pip._internal.utils.hashes import FAVORITE_HASH
      from pip._internal.download import is_file_url, path_to_url, url_to_path
      from pip._internal.index import FormatControl, PackageFinder
      from pip._internal.wheel import Wheel
      from pip._internal import cmdoptions
      from pip._internal.utils.misc import get_installed_distributions
      from pip._internal.models.index import PyPI
  else:
      from pip.exceptions import InstallationError
      from pip.req.req_install import InstallRequirement
      from pip.req.req_file import parse_requirements
      from pip.req.req_set import RequirementSet
      from pip.utils.appdirs import user_cache_dir
      from pip.utils.hashes import FAVORITE_HASH
      from pip.download import is_file_url, path_to_url, url_to_path
      from pip.index import FormatControl, PackageFinder
      from pip.wheel import Wheel, WheelCache
      from pip import cmdoptions
      from pip.utils import get_installed_distributions
      from pip.models.index import PyPI
  
  
  __all__ = [
      'Command',
      'FAVORITE_HASH',
      'FormatControl',
      'InstallRequirement',
      'InstallationError',
      'PackageFinder',
      'PyPI',
      'Requirement',
      'RequirementSet',
      'Wheel',
      'WheelCache',
      'cmdoptions',
      'get_installed_distributions',
      'is_file_url',
      'parse_requirements',
      'path_to_url',
      'url_to_path',
      'user_cache_dir',
  ]
  
subject: Support for new location of Command