from collections import OrderedDict

list1 = [1,5,2,1,10]

print(list(set(list1))) #[1, 2, 10, 5] 这种方式会改变list里面元素的位置

"""

先介绍fromkeys()函数

fromkeys()就是根据序列生成字典

"""

new1 = OrderedDict.fromkeys(["name","age","school"])

print(new1) #OrderedDict([('name', None), ('age', None), ('school', None)])  , 没有提供value,所以默认是none

new2 = OrderedDict.fromkeys(["name","age","school"],['shun','18',"shu"])

print(new2)#OrderedDict([('name', ['shun', '18', 'shu']), ('age', ['shun', '18', 'shu']), ('school', ['shun', '18', 'shu'])])

new = OrderedDict.fromkeys(list1)

print(new)  #OrderedDict([(1, None), (5, None), (2, None), (10, None)])

print(list(new.keys())) #[1, 5, 2, 10]

import numpy as np

nd = np.array(list1)

print(nd) #[ 1  5  2  1 10]

print(np.unique(nd)) #[ 1  2  5 10]  元素位置发生了变化