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  • Python学习_算数运算函数

    记录以grades列表为例,分别定义输出、求和、平均值、方差和标准差函数,并输出相应的值

    grades = [100, 100, 90, 40, 80, 100, 85, 70, 90, 65, 90, 85, 50.5]
    #定义输出函数
    def print_grades(grades):
        for grade in grades:
            print grade
    #定义求和函数
    def grades_sum(grades):
        total = 0
        for grade in grades: 
            total += grade
        return total
    #定义求平均值函数   
    def grades_average(grades):
        sum_of_grades = grades_sum(grades)
        average = sum_of_grades / float(len(grades))
        return average
    #定义求方差函数
    def grades_variance(scores):
        average=grades_average(scores)
        variance=0
        for score in scores:
            variance+=(average-score)**2
        return variance/len(scores)
    #定义求标准差函数    
    def grades_std_deviation(variance):
        return variance**0.5
        
    variance=grades_variance(grades)
    #调用函数分别输出对应的值
    print print_grades(grades)
    print grades_sum(grades)
    print grades_average(grades)
    print grades_variance(grades)
    print grades_std_deviation(variance)
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  • 原文地址:https://www.cnblogs.com/liutong3310/p/3732331.html
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