Return a list of name,value pairs for all Parameters of this object.

When called on an instance with onlychanged set to True, will only return values that are not equal to the default value (onlychanged has no effect when called on a class).

Deprecated since version 1.12.0: Use .param.values().items() instead (or .param.values() for the common case of dict(….param.get_param_values()))