class_docstr: Unicode wrapper around a process running in a pseudoterminal.
  
  This class exposes a similar interface to :class:`PtyProcess`, but its read
  methods return unicode, and its :meth:`write` accepts unicode.
docstr: Read one line from the pseudoterminal, and return it as unicode.
  
  Can block if there is nothing to read. Raises :exc:`EOFError` if the
  terminal was closed.
docstr_tok: ["Read","one","line","from","the","pseudoterminal",",","and","return","it","as","unicode",".","Can","block","if","there","is","nothing","to","read",".","Raises",":","exc",":","`","EOFError","`","if","the","terminal","was","closed","."]
code: def readline(self):
      """Read one line from the pseudoterminal, and return it as unicode.
  
      Can block if there is nothing to read. Raises :exc:`EOFError` if the
      terminal was closed.
      """
      b = super(PtyProcessUnicode, self).readline()
      return self.decoder.decode(b, final=False)
  
imports: import codecs
  import errno
  import fcntl
  import io
  import os
  import pty
  import resource
  import signal
  import struct
  import sys
  import termios
  import time
  from pty import STDIN_FILENO, CHILD
  from .util import which, PtyProcessError
label_desc: Use image node_id 3 for calling the PtyProcessUnicode obj's underlying member method code with example usage: obj.readline() and returns: self