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()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

      """
      @author:nickhuang1996
      """
      from collections import OrderedDict
      if __name__ == '__main__':
      '''dict()'''
       champions1 = dict()
       champions1['乔峰'] = 1
       champions1['段誉'] = 3
       champions1['虚竹'] = 2
       print("champions1:{}".format(champions1))#champions1:{'乔峰': 1, '段誉': 3, '虚竹': 2}
       print("")
       print("显示value:")
      for value in champions1:
       print("{}".format(value))
       print("")
       print("显示key和value:")
      for key, value in champions1.items():
       print("{},{}".format(key, value))
       print("")
      #keys()显示键值
       print("keys()显示键值:")
       print(list(champions1.keys()))#['乔峰', '段誉', '虚竹']
       print("")
      #values()显示每个value
       print("values()显示每个value:")
       print(list(champions1.values()))#[1, 3, 2]
       print("")
      #values()[k]显示第k个value
       print("values()[k]显示第k个value:")
       print(list(champions1.values())[0])#1
       print(list(champions1.values())[1])#3
       print(list(champions1.values())[2])#2
       print("")
      #values()index(k)通过value值找对应的序号
       print("values()index(k)通过value值找key的序号:")
       print(list(champions1.values()).index(1))#0
       print(list(champions1.values()).index(2))#2
       print(list(champions1.values()).index(3))#1
       print("")
      #keys()values()index(k)通过value值找key的序号找到对应的key
       print("keys()values()index(k)通过value值找key的序号找到对应的key:")
       print((list(champions1.keys())[list(champions1.values()).index(1)]))#乔峰
       print((list(champions1.keys())[list(champions1.values()).index(2)]))#虚竹
       print((list(champions1.keys())[list(champions1.values()).index(3)]))#段誉
       print("")
      #sorted(values())按照value值排序
       print("sorted(values())按照value值排序:")
       champions1 = dict([(list(champions1.keys())[list(champions1.values()).index(value)],value) for value in sorted(champions1.values())])
       print(champions1)#{'乔峰': 1, '虚竹': 2, '段誉': 3}
       print("")
      '''OrderedDict'''
       champions2 = OrderedDict()
       champions2['乔峰'] = 1
       champions2['段誉'] = 3
       champions2['虚竹'] = 2
       print("champions2:{}".format(champions2))#champions2:OrderedDict([('乔峰', 1), ('段誉', 3), ('虚竹', 2)])
       print("")
       print("显示value:")
      for value in champions2:
       print("{}".format(value))
       print("")
       print("显示key和value:")
      for key, value in champions2.items():
       print("{},{}".format(key, value))
       print("")
      #sorted(values())按照value值排序
       print("sorted(values())按照value值排序:")
       champions2 = OrderedDict([(list(champions2.keys())[list(champions2.values()).index(value)],value) for value in sorted(champions2.values())])
       print(champions2)#OrderedDict([('乔峰', 1), ('虚竹', 2), ('段誉', 3)])
       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