def __init__(self, identifier=None, session_identifier=None):
    """Initializes a task start attribute container.

    Args:
      identifier (Optional[str]): unique identifier of the task.
          The identifier should match that of the corresponding
          task completion information.
      session_identifier (Optional[str]): identifier of the session the task
          is part of.
    """
    super(TaskStart, self).__init__()
    self.identifier = identifier
    self.session_identifier = session_identifier
    self.timestamp = None
def __init__ ( self , identifier = None , session_identifier = None ) : super ( TaskStart , self ) . __init__ ( ) self . identifier = identifier self . session_identifier = session_identifier self . timestamp = None
Initializes a task start attribute container.

    Args:
      identifier (Optional[str]): unique identifier of the task.
          The identifier should match that of the corresponding
          task completion information.
      session_identifier (Optional[str]): identifier of the session the task
          is part of.