docs: def get_commits(self, sha=github.GithubObject.NotSet, path=github.GithubObject.NotSet, since=github.GithubObject.NotSet, until=github.GithubObject.NotSet, author=github.GithubObject.NotSet):
          """
          :calls: `GET /repos/:owner/:repo/commits <http://developer.github.com/v3/repos/commits>`_
          :param sha: string
          :param path: string
          :param since: datetime.datetime
          :param until: datetime.datetime
          :param author: string or :class:`github.NamedUser.NamedUser` or :class:`github.AuthenticatedUser.AuthenticatedUser`
          :rtype: :class:`github.PaginatedList.PaginatedList` of :class:`github.Commit.Commit`
          """
          assert sha is github.GithubObject.NotSet or isinstance(sha, (str, unicode)), sha
          assert path is github.GithubObject.NotSet or isinstance(path, (str, unicode)), path
          assert since is github.GithubObject.NotSet or isinstance(since, datetime.datetime), since
          assert until is github.GithubObject.NotSet or isinstance(until, datetime.datetime), until
          assert author is github.GithubObject.NotSet or isinstance(author, (str, unicode, github.NamedUser.NamedUser, github.AuthenticatedUser.AuthenticatedUser)), author
          url_parameters = dict()
          if sha is not github.GithubObject.NotSet:
              url_parameters["sha"] = sha
          if path is not github.GithubObject.NotSet:
              url_parameters["path"] = path
          if since is not github.GithubObject.NotSet:
              url_parameters["since"] = since.strftime("%Y-%m-%dT%H:%M:%SZ")
          if until is not github.GithubObject.NotSet:
              url_parameters["until"] = until.strftime("%Y-%m-%dT%H:%M:%SZ")
          if author is not github.GithubObject.NotSet:
              if isinstance(author, (github.NamedUser.NamedUser, github.AuthenticatedUser.AuthenticatedUser)):
                  url_parameters["author"] = author.login
              else:
                  url_parameters["author"] = author
          return github.PaginatedList.PaginatedList(
              github.Commit.Commit,
              self._requester,
              self.url + "/commits",
              url_parameters
          )