关于python：如何只添加键s1中的值


how to add just the values in key s1

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students={
1: {"pup1":"001","s1": 10,"s2": 20},

2: {"pup2":"124","s1": 20,"s2": 30},

3: {"pup3":"125","s1": 30,"s2": 40}}
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    如果要添加s1的所有值，则需要迭代字典学生的values()。

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        students={
    1: {"pup1":"001","s1": 10,"s2": 20},

    2: {"pup2":"124","s1": 20,"s2": 30},

    3: {"pup3":"125","s1": 30,"s2": 40}}

    sum1 = 0
    for data in students.values():
        sum1 += data['s1']

    avg = sum1 / len(students)

    print(sum1)
    print(avg)
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