docstr: Read a line of text.
  
  :returns: An 8-bit string.
code: def readline(self):
      """
      Read a line of text.
  
      :returns: An 8-bit string.
      """
      s = ""
      while True:
          c = self.read(1)
          if not c:
              break
          s = s + c
          if c == "\n":
              break
      return s
  
file_path: catboost/contrib/python/Pillow/py2/PIL/ContainerIO.py
imports: import io
label_desc: Use image node_id 6 for calling the ContainerIO obj's underlying member method code with example usage: obj.readline() and returns: s