class_docstr: Defines a container of event triggers' metadata.
class_docstr_tok: ["Defines","a","container","of","event","triggers","'","metadata","."]
code: def __contains__(self, id):
      try:
          return bool(self.__getitem__(id))
      except KeyError:
          return False
  
file_path: metaflow/metaflow/events.py
imports: from collections import OrderedDict, namedtuple
  from datetime import datetime
label_desc: Use image node_id 9 for calling the Trigger obj's underlying member method code with example usage: obj.__contains__(id) and returns: bool, False