docs: def put(self, local, remote=None, preserve_mode=True):
          """
          Upload a file from the local filesystem to the current connection.
  
          :param local:
              Local path of file to upload, or a file-like object.
  
              **If a string is given**, it should be a path to a local (regular)
              file (not a directory).
  
              .. note::
                  When dealing with nonexistent file paths, normal Python file
                  handling concerns come into play - for example, trying to
                  upload a nonexistent ``local`` path will typically result in an
                  `OSError`.
  
              **If a file-like object is given**, its contents are written to the
              remote file path.
  
          :param str remote:
              Remote path to which the local file will be written.
  
              .. note::
                  Most SFTP servers set the remote working directory to the
                  connecting user's home directory, and (unlike most shells) do
                  *not* expand tildes (``~``).
  
                  For example, instead of saying ``put("archive.tgz",
                  "~/tmp/")``, say ``put("archive.tgz", "tmp/")``.
  
                  In addition, this means that 'falsey'/empty values (such as the
                  default value, ``None``) are allowed and result in uploading to
                  the remote home directory.
  
              .. note::
                  When ``local`` is a file-like object, ``remote`` is required
                  and must refer to a valid file path (not a directory).
  
          :param bool preserve_mode:
              Whether to ``chmod`` the remote file so it matches the local file's
              mode (default: ``True``).
  
          :returns: A `.Result` object.
  
          .. versionadded:: 2.0
          """
          if not local:
              raise ValueError("Local path must not be empty!")
  
          is_file_like = hasattr(local, "write") and callable(local.write)
  
          # Massage remote path
          orig_remote = remote
          if is_file_like:
              local_base = getattr(local, "name", None)
          else:
              local_base = os.path.basename(local)
          if not remote:
              if is_file_like:
                  raise ValueError(
                      "Must give non-empty remote path when local is a file-like object!"  # noqa
                  )
              else:
                  remote = local_base
                  debug("Massaged empty remote path into {!r}".format(remote))
          elif self.is_remote_dir(remote):
              # non-empty local_base implies a) text file path or b) FLO which
              # had a non-empty .name attribute. huzzah!
              if local_base:
                  remote = posixpath.join(remote, local_base)
              else:
                  if is_file_like:
                      raise ValueError(
                          "Can't put a file-like-object into a directory unless it has a non-empty .name attribute!"  # noqa
                      )
                  else:
                      # TODO: can we ever really end up here? implies we want to
                      # reorganize all this logic so it has fewer potential holes
                      raise ValueError(
                          "Somehow got an empty local file basename ({!r}) when uploading to a directory ({!r})!".format(  # noqa
                              local_base, remote
                          )
                      )
  
          prejoined_remote = remote
          remote = posixpath.join(
              self.sftp.getcwd() or self.sftp.normalize("."), remote
          )
          if remote != prejoined_remote:
              msg = "Massaged relative remote path {!r} into {!r}"
              debug(msg.format(prejoined_remote, remote))
  
          # Massage local path
          orig_local = local
          if not is_file_like:
              local = os.path.abspath(local)
              if local != orig_local:
                  debug(
                      "Massaged relative local path {!r} into {!r}".format(
                          orig_local, local
                      )
                  )  # noqa
  
          # Run Paramiko-level .put() (side-effects only. womp.)
          # TODO: push some of the path handling into Paramiko; it should be
          # responsible for dealing with path cleaning etc.
          # TODO: probably preserve warning message from v1 when overwriting
          # existing files. Use logging for that obviously.
          #
          # If local appears to be a file-like object, use sftp.putfo, not put
          if is_file_like:
              msg = "Uploading file-like object {!r} to {!r}"
              debug(msg.format(local, remote))
              pointer = local.tell()
              try:
                  local.seek(0)
                  self.sftp.putfo(fl=local, remotepath=remote)
              finally:
                  local.seek(pointer)
          else:
              debug("Uploading {!r} to {!r}".format(local, remote))
              self.sftp.put(localpath=local, remotepath=remote)
              # Set mode to same as local end
              # TODO: Push this down into SFTPClient sometime (requires backwards
              # incompat release.)
              if preserve_mode:
                  local_mode = os.stat(local).st_mode
                  mode = stat.S_IMODE(local_mode)
                  self.sftp.chmod(remote, mode)
          # Return something useful
          return Result(
              orig_remote=orig_remote,
              remote=remote,
              orig_local=orig_local,
              local=local,
              connection=self.connection,
          )