class_docstr: Represents a block for an EventEmitter to be used in a context
  manager (i.e. 'with' statement).
class_docstr_tok: ["Represents","a","block","for","an","EventEmitter","to","be","used","in","a","context","manager","(","i.e",".","'with","'","statement",")","."]
code: def __init__(self, target, callback=None):
      self.target = target
      self.callback = callback
  
imports: from __future__ import division
  from collections import OrderedDict
  import inspect
  import traceback
  import weakref
  from .logs import logger, _handle_exception
label_desc: Use image node_id 1 to create a new EventBlocker object from inherited base classes: object with example: obj = EventBlocker(target, callback)