std_deviation with warning

convert.py

import numpy
import math
class valueConverter:
    @staticmethod
    def std_deviation(Values, format=True):
        result = numpy.std(Values)
        average = numpy.mean(Values)
        for value in Values:
            if not math.isclose(value, average, abs_tol=0.1): # individual numbers should differ by less than 0.1 from any other number
                if format:
                    return f'standard deviation = {result:.3f} \n warning individual values >= 0.1 from mean'
        if format:
            return f'standard deviation = {result:.3f}'
        return result