code: def expect_flow_mapping_value(self):
      if self.canonical or self.column > self.best_width:
          self.write_indent()
      self.write_indicator(":", True)
      self.states.append(self.expect_flow_mapping_key)
      self.expect_node(mapping=True)
  
imports: from .error import YAMLError
  from .events import *
label_desc: Use image node_id 23 for calling the Emitter obj's underlying member method code with example usage: obj.expect_flow_mapping_value() without return types