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  • python实例:在列表,字典,集合中,根据条件筛选数据

    1. 从列表中过滤掉 负数

    from random import randint
    
    # 随机生成列表
    data = [randint(-10, 10) for _ in range(10)]
    print(data) #输出 [-4, -2, 2, -10, 8, 10, -6, 6, 3, -9]
    
    # 1 用 filter 实现
    ret = filter(lambda x: x >= 0, data)
    print( list(ret)) # 输出 [2, 8, 10, 6, 3]
    # 2 用列表解析实现
    ret2 = [x for x in data if x >= 0]
    print(ret2) # 输出 [2, 8, 10, 6, 3]
     

    2.从字典中获取分数大于90 的人

    from random import randint
    
    # 随机生成字典, {学号:分数}
    score = {x:randint(60,100) for x in range(1, 21)}
    print(score) # {1: 97, 2: 94, 3: 86, 4: 83, 5: 90, 6: 85, 7: 100, 8: 68, 9: 96, 10: 67, 11: 65, 12: 98, 13: 84, 14: 69, 15: 62, 16: 73, 17: 79, 18: 70, 19: 77, 20: 99}
    
    ret = {k : v for k, v in score.items() if v > 90}
    print(ret) # {1: 97, 2: 94, 7: 100, 9: 96, 12: 98, 20: 99}

    3.能被3整除的集合

    ret_set = {x for x in set1 if x % 3 == 0}
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  • 原文地址:https://www.cnblogs.com/appleat/p/10032210.html
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