human
Complete the below
def is_equivalent_mismatch(expected):

    ''''Matches another mismatch.
    :param Optional[Mismatch] expected: If None, then match None,
    otherwise, match a mismatch that has the same description and details.
    :rtype: Matcher'
    '''

Can you provide a the Python code you requested?
assistant
#Here is the Python code you requested.
    def to_dict(mismatch):
        return {'details': mismatch.get_details(), 'description': mismatch.describe()}
    if (expected is None):
        return Is(None)
    return AfterPreprocessing(to_dict, Equals(to_dict(expected)), annotate=False)