>>> list1 = [7,8,7,8,9,10]
>>> set(list1)
{8, 9, 10, 7}

2.使用字典函数

>>> list1 = [7,8,7,8,9,10]
>>> b = dict.fromkeys(list1)
>>> b
{7: None, 8: None, 9: None, 10: None}
>>> c = list(b.keys())
>>> c
[7, 8, 9, 10]

fromkeys()的用法

用于创建并返回一个新的字典。两个参数:第一个是字典的键,第二个(可选)是传入键的值,默认为None。 第一个值可以是字符串、列表、元祖、字典

  • 实例一:

      #列表
      >>> dict1 = dict.fromkeys([1,2,3])
      >>> dict1
      {1: None, 2: None, 3: None}
      #元组
      >>> dict1 = dict.fromkeys((1,2,3))
      >>> dict1
      {1: None, 2: None, 3: None}
    
  • 实例二:

      #修改默认值
      >>> dict2 = dict.fromkeys([1,2,3,],'test')
      >>> dict2
      {1: 'test', 2: 'test', 3: 'test'}
    
      >>> dict2 = dict.fromkeys([1,2,3,],10)
      >>> dict2
      {1: 10, 2: 10, 3: 10}
    
  • 实例三:

      #需要注意!
      >>> dict3 = dict.fromkeys([1,2,3],['one','two','three'])
      >>> dict3
      {1: ['one', 'two', 'three'], 2: ['one', 'two', 'three'], 3: ['one', 'two', 'three']}

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