def uncorrected_stdev(iterable):
    if not iterable:
        return None
    if len(iterable) == 1:
        return 0
    iter_mean = mean(iterable)
    deltas = [(x - iter_mean) ** 2 for x in iterable]
    variance = float(sum(deltas)) / len(iterable)
    return math.sqrt(variance)
Test the initialize functionality.
dataset/ETHPy150Open swiftstack/ssbench/ssbench/util.py/uncorrected_stdev--crossover with--dataset/ETHPy150Open log2timeline/dfvfs/tests/vfs/encrypted_stream_file_entry.py/EncryptedStreamFileEntryTest.testInitialize