Python 3.6的dict竟然是有序的!dict和OrderedDict的用法示例
【摘要】 目录
一、关于dict()函数
二、代码(结果)
一、关于dict()函数
1.详情看网址:https://mail.python.org/pipermail/python-dev/2016-September/146327.html
2.3.6版本的Python已经使得dict变得紧凑以及关键字变得有序
二、代码(结果)
dict()和OrderedDict...
目录
一、关于dict()函数
1.详情看网址:https://mail.python.org/pipermail/python-dev/2016-September/146327.html
2.3.6版本的Python已经使得dict变得紧凑以及关键字变得有序
二、代码(结果)
dict()和OrderedDict()用法在代码中有详细的注释,OrderedDict需要从collections包中导入,值得注意的是3.6版本的dict()函数使得结果不再无序
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"""
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@author:nickhuang1996
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"""
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from collections import OrderedDict
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if __name__ == '__main__':
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'''dict()'''
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champions1 = dict()
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champions1['乔峰'] = 1
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champions1['段誉'] = 3
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champions1['虚竹'] = 2
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print("champions1:{}".format(champions1))#champions1:{'乔峰': 1, '段誉': 3, '虚竹': 2}
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print("")
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print("显示value:")
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for value in champions1:
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print("{}".format(value))
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print("")
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print("显示key和value:")
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for key, value in champions1.items():
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print("{},{}".format(key, value))
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print("")
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#keys()显示键值
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print("keys()显示键值:")
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print(list(champions1.keys()))#['乔峰', '段誉', '虚竹']
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print("")
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#values()显示每个value
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print("values()显示每个value:")
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print(list(champions1.values()))#[1, 3, 2]
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print("")
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#values()[k]显示第k个value
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print("values()[k]显示第k个value:")
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print(list(champions1.values())[0])#1
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print(list(champions1.values())[1])#3
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print(list(champions1.values())[2])#2
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print("")
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#values()index(k)通过value值找对应的序号
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print("values()index(k)通过value值找key的序号:")
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print(list(champions1.values()).index(1))#0
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print(list(champions1.values()).index(2))#2
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print(list(champions1.values()).index(3))#1
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print("")
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#keys()values()index(k)通过value值找key的序号找到对应的key
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print("keys()values()index(k)通过value值找key的序号找到对应的key:")
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print((list(champions1.keys())[list(champions1.values()).index(1)]))#乔峰
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print((list(champions1.keys())[list(champions1.values()).index(2)]))#虚竹
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print((list(champions1.keys())[list(champions1.values()).index(3)]))#段誉
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print("")
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#sorted(values())按照value值排序
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print("sorted(values())按照value值排序:")
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champions1 = dict([(list(champions1.keys())[list(champions1.values()).index(value)],value) for value in sorted(champions1.values())])
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print(champions1)#{'乔峰': 1, '虚竹': 2, '段誉': 3}
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print("")
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'''OrderedDict'''
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champions2 = OrderedDict()
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champions2['乔峰'] = 1
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champions2['段誉'] = 3
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champions2['虚竹'] = 2
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print("champions2:{}".format(champions2))#champions2:OrderedDict([('乔峰', 1), ('段誉', 3), ('虚竹', 2)])
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print("")
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print("显示value:")
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for value in champions2:
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print("{}".format(value))
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print("")
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print("显示key和value:")
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for key, value in champions2.items():
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print("{},{}".format(key, value))
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print("")
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#sorted(values())按照value值排序
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print("sorted(values())按照value值排序:")
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champions2 = OrderedDict([(list(champions2.keys())[list(champions2.values()).index(value)],value) for value in sorted(champions2.values())])
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print(champions2)#OrderedDict([('乔峰', 1), ('虚竹', 2), ('段誉', 3)])
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print("")
文章来源: nickhuang1996.blog.csdn.net,作者:悲恋花丶无心之人,版权归原作者所有,如需转载,请联系作者。
原文链接:nickhuang1996.blog.csdn.net/article/details/89279200
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