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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 do_map(input_dict, feature_format, positive_class=None):
    '''
    Maps a new example to a set of features.
    '''
    # Context of the unseen example(s)
    train_context = input_dict['train_ctx']
    test_context = input_dict['test_ctx']

    # Currently known examples & background knowledge
    features = input_dict['features']
    format = input_dict['output_format']

    evaluations = domain_map(features, feature_format, train_context,
                             test_context, format=format,
                             positive_class=positive_class)
    return {'evaluations': evaluations}