def hmean(iterable):
    a = iterable if isinstance(iterable, list) else list(iterable)
    return float(len(a)) / sum(1.0 / x for x in a)
This is a test of the column attribute change notification system.
dataset/ETHPy150Open clips/pattern/pattern/metrics.py/hmean--crossover with--dataset/ETHPy150Open spacetelescope/PyFITS/pyfits/tests/test_table.py/TestColumnFunctions.test_column_attribute_change_after_removal