human
Write me a the Python code you requested given the following:
Complete the below
def attr(**kwargs):

    ''''A decorator which applies the testtools attr decorator
    This decorator applies the testtools.testcase.attr if it is in the list of
    attributes to testtools we want to apply.'
    '''
assistant
#Here is the Python code you requested.
    def decorator(f):
        if (('type' in kwargs) and isinstance(kwargs['type'], str)):
            f = testtools.testcase.attr(kwargs['type'])(f)
        elif (('type' in kwargs) and isinstance(kwargs['type'], list)):
            for attr in kwargs['type']:
                f = testtools.testcase.attr(attr)(f)
        return f
    return decorator