code: def __init__(self):
      self._ret_type = None
      self._cases = []
  
imports: import hail
  from hail.typecheck import typecheck_method
  from hail.expr.expressions import unify_types, unify_types_limited, expr_any, expr_bool, ExpressionException, construct_expr, expr_str
  from hail import ir
label_desc: Use image node_id 1 to create a new ConditionalBuilder object from inherited base classes: object with example: obj = ConditionalBuilder()