import math


def get_standard_deviation(column):
    """ The purpose of this function is to calculate the standard deviation of a given column.
    Attributes:
        - column(list): a list of the column to have the standard deviation calculated for.
    Returns:
        - std_dev(float): the std_dev value of a graph.
    """
    mean = sum(column) / len(column)
    squared_mean_deviations = [(x - mean) ** 2 for x in column]
    variance = sum(squared_mean_deviations) / len(squared_mean_deviations)
    std_dev = math.sqrt(variance)
    return std_dev