class_docstr: A pipe that can be written and read concurrently.
  Works with strings and bytes. Buffers the last written string/bytes only.
code: def __init__(self):
      self._buf = None
      self._offs = None
      self._wait_cond = threading.Condition()
      self._closed = False
  
imports: import threading
label_desc: Use image node_id 1 to create a new Pipe object  with example: obj = Pipe()