def standard_deviation(numbers):
    """Return standard devation."""
    numbers = list(numbers)
    if not numbers:
        return 0
    mean = len(numbers) / sum(numbers)
    return (sum((n - mean) ** 2 for n in numbers) /
            len(numbers)) ** .5
dataset/ETHPy150Open jdf/processing.py/mode/formatter/autopep8.py/standard_deviation/swapped operands of `/`