code: def is_outdated(dist, dep=False):
      
      if dep:
          required = get_required(dist)
      else:
          required = set([dist])
      ListCommand = pip.commands['list']
      lc = ListCommand()
      options, args = lc.parse_args(['--outdated'])
      outdated = {}
      for d, raw_ver, parsed_ver in lc.find_packages_latests_versions(options):
          for r in required:
              if d.project_name == r.project_name and parsed_ver > r.parsed_version:
                  outdated[r] = parsed_ver
      return outdated
docs: Return a dict with outdated distributions
  
      If the given distribution has dependencies, they are checked as well.
  
      :param dist: a distribution to check
      :type dist: :class:`pkg_resources.Distribution` | str
      :param dep: If True, also return all outdated dependencies. If False, only check given dist.
      :type dep:
      :returns: dictionary of all distributions that are outdated and are either dependencies
                of the given distribution or the distribution itself.
                Keys are the outdated distributions
                and values are the newest parsed versions.
      :rtype: dict of :class:`pkg_resources.Distribution`
      :raises: class:`pkg_resources.DistributionNotFound`