class_docstr: Specialization of StackContext for exception handling.
  
  The supplied ``exception_handler`` function will be called in the
  event of an uncaught exception in this context.  The semantics are
  similar to a try/finally clause, and intended use cases are to log
  an error, close a socket, or similar cleanup actions.  The
  ``exc_info`` triple ``(type, value, traceback)`` will be passed to the
  exception_handler function.
  
  If the exception handler returns true, the exception will be
  consumed and will not be propagated to other exception handlers.
class_docstr_tok: ["Specialization","of","StackContext","for","exception","handling",".","The","supplied","``","exception_handler","``","function","will","be","called","in","the","event","of","an","uncaught","exception","in","this","context",".","The","semantics","are","similar","to","a","try\/finally","clause",",","and","intended","use","cases","are","to","log","an","error",",","close","a","socket",",","or","similar","cleanup","actions",".","The","``","exc_info","``","triple","``","(","type",",","value",",","traceback",")","``","will","be","passed","to","the","exception_handler","function",".","If","the","exception","handler","returns","true",",","the","exception","will","be","consumed","and","will","not","be","propagated","to","other","exception","handlers","."]
code: def exit(self, type, value, traceback):
      if type is not None:
          return self.exception_handler(type, value, traceback)
  
imports: from __future__ import absolute_import, division, print_function
  import sys
  import threading
  from tornado.util import raise_exc_info
label_desc: Use image node_id 3 for calling the ExceptionStackContext obj's underlying member method code with example usage: obj.exit(type, value, traceback) and returns: self