code: def delete(self, message, branch=None, committer=None, author=None):
          
          json = None
          if message:
              data = {'message': message, 'sha': self.sha, 'branch': branch,
                      'committer': validate_commmitter(committer),
                      'author': validate_commmitter(author)}
              self._remove_none(data)
              json = self._json(self._delete(self._api, data=dumps(data)), 200)
              if 'commit' in json:
                  json = Commit(json['commit'], self)
          return json
docs: Delete this file.
  
          :param str message: (required), commit message to describe the removal
          :param str branch: (optional), branch where the file exists.
              Defaults to the default branch of the repository.
          :param dict committer: (optional), if no information is given the
              authenticated user's information will be used. You must specify
              both a name and email.
          :param dict author: (optional), if omitted this will be filled in with
              committer information. If passed, you must specify both a name and
              email.
          :returns: :class:`Commit <github3.git.Commit>`