OrderedDict([('apple', 4), ('banana', 3),('orange', 2), ('pear', 1)]) >>> # dictionary sorted by value >>> OrderedDict(sorted(d.items(),key=lambda t: t[1])) OrderedDict([('pear', 1), ('orange', 2),('banana', 3), ('apple', 4)]) >>> # dictionary sorted bylen...
(cls, iterable, value=None): '''Create a new ordered dictionary with keys from iterable and values set to value. ''' self = cls() for key in iterable: self[key] = value return self def __eq__(self, other): '''od.__eq__(y) <==> od==y. Comparison to another OD is ...
defnested_odict_to_dict(nested_odict):# Convert the nested ordered dictionary into a regular dictionary and store itinthe variable"result".result=dict(nested_odict)# Iterate through each key-value pairinthe dictionary.forkey,valueinresult.items():# Checkifthe value is an instanceofthe Ordere...
字典(Dictionary)是 Python 中常用的数据结构之一,用于存储键值对(key-value pairs)。字典的特点是可变的、无序的,且键(key)必须是唯一的,但值(value)可以重复。 不惑 2024/02/01 2460 python︱ collections模块(namedtuple/defaultdict/OrderedDict等)
A dictionary in Python is a built-in data type to store and manage data in pairs of keys and values. Unlike lists or tuples, which are ordered, dictionaries are unordered collections-they do not have their items stored in any given sequence. Each item consists of a unique key with its ...
要创建有序字典,首先需要导入collections模块,并使用其中的OrderedDict类。 fromcollectionsimportOrderedDict ordered_dict=OrderedDict()ordered_dict['a']=1ordered_dict['b']=2ordered_dict['c']=3print(ordered_dict) 1. 2. 3. 4. 5. 6. 7.
ordered_dict=OrderedDict([('apple',1),('banana',2),('orange',3)])print(dict(ordered_dict)) 1. 2. 3. 4. 2.3 defaultdict转字典 defaultdict也可以直接转换为字典: fromcollectionsimportdefaultdict default_dict=defaultdict(lambda:'N/A',{'apple':3,'banana':2})print(dict(default_dict)) ...
5. collections模块 Python的collections模块中提供了一个OrderedDict类，它是一个有序的字典（按照插入的顺序排序）。通过collections模块的OrderedDict类创建字典可以保持插入顺序不变。例如：from collections import OrderedDictordered_dict = OrderedDict([('name', 'Alice'), ('age', 25), ('city', 'New York'...
OrderedDict,实现了对字典对象中元素的排序。请看下面的实例: 1importcollections2print"Regular dictionary"3d={}4d['a']='A'5d['b']='B'6d['c']='C'7fork,vind.items():8printk,v910print"\nOrder dictionary"11d1 =collections.OrderedDict()12d1['a'] ='A'13d1['b'] ='B'14d1['c'] =...
4.2.2 collections.OrderedDict 如果需要保持插入顺序,可以使用collections.OrderedDict。 fromcollectionsimportOrderedDict ordered_fruits=OrderedDict([('apple',3),('kiwi',7),('pear',7),('lemon',8)])forkeyinordered_fruits:print(key) 4.3 字典的浅拷贝与深拷贝 ...