human
I wrote the below code

    def Decorator(test_method):
        if isinstance(test_method, collections.Iterable):
            actual_tests = []
            for old_test in test_method.testcases:
                new_dict = old_test[1].copy()
                new_dict[key] = value
                test_suffix = ('%s_%s_%s' % (old_test[0], key, value))
                actual_tests.append((test_suffix, new_dict))
            test_method.testcases = actual_tests
            return test_method
        else:
            test_suffix = ('_%s_%s' % (key, value))
            tests_to_make = ((test_suffix, {key: value}),)
            return parameterized.NamedParameters(*tests_to_make)(test_method)
    return Decorator

What's a good function header?

=====
Give me a Python program to fix = ('%s_%s_%s' % (old_test[0], key, value))?
assistant
#Here is Python program to fix = ('%s_%s_%s' % (old_test[0], key, value))
.

def DictDecorator(key, value):