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    1.

    1. def num_sum(a, b, c):
    2. return a + b + c
    3. def num_avg(num_sum):
    4. return num_sum /3
    5. a, b, c = map(int, input('please input 3 numbers,a b c:').split())
    6. print(num_avg(num_sum(a, b, c)))

    2.

    1. l = ["jack",("tom",23),"rose",(14,55,67)]
    2. def f(l):
    3. for i in l:
    4. if isinstance(i,tuple):
    5. f(i)
    6. else:
    7. print(i)
    8. f(l)

    3.

    1. infors = [{'name': 'qianan', 'age': 28}, {'name': 'an', 'age': 20}, {'name': 'james', 'age': 25}]
    2. print(sorted(infors, key=lambda k: k['name']))
    3. #infor.sort(key=lambda k: k['name'])
    4. #print(infor)