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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def print_param_defaults(self_):
 """Print the default values of all cls's Parameters."""

        cls = self_.cls
        for key,val in cls.__dict__.items():
            if isinstance(val,Parameter):
                print(cls.__name__+'.'+key+ '='+ repr(val.default))