parameters: (self, key, default)
docstring: Set the value for the keys if not already specified.
  
          Args:
              key: Valid keys specifications (depends on the expected key
                  length).
              default (``any``): The value to default to if a key is not found in
                  the mapping.  Must be compatible with the typing specification
                  specified on construction.
docstring_summary: Set the value for the keys if not already specified.
docstring_tokens: Set the value for the keys if not already specified .
function: def setdefault(self, key, default):
          """Set the value for the keys if not already specified.
  
          Args:
              key: Valid keys specifications (depends on the expected key
                  length).
              default (``any``): The value to default to if a key is not found in
                  the mapping.  Must be compatible with the typing specification
                  specified on construction.
          """
          self.param_dict.setdefault(key, default)
function_tokens: def setdefault ( self , key , default ) : self . param_dict . setdefault ( key , default )