code: def __init__(self, msg="", lineno=None):
      self.message = msg
      self.line_no = lineno
      super(MetaflowException, self).__init__()
  
imports: import sys
  import traceback
label_desc: Use image node_id 1 to create a new MetaflowException object from inherited base classes: Exception with example: obj = MetaflowException(msg, lineno)