class_docstr: Base class for containers.
  
  Containers are classes that collect semantically related Artists such as
  the bars of a bar plot.
class_docstr_tok: ["Base","class","for","containers",".","Containers","are","classes","that","collect","semantically","related","Artists","such","as","the","bars","of","a","bar","plot","."]
code: def __init__(self, kl, label=None):
      self.eventson = False  # fire events only if eventson
      self._oid = 0  # an observer id
      self._propobservers = {}  # a dict from oids to funcs
  
      self._remove_method = None
  
      self.set_label(label)
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import six
  import matplotlib.cbook
  import matplotlib.artist
label_desc: Use image node_id 3 to create a new Container object from inherited base classes: tuple with example: obj = Container(kl, label)