ordereddictionary

Are there any reasons not to use an OrderedDict?

由 倾然丶 夕夏残阳落幕 提交于 2019-11-27 03:10:35
I'm referring to the OrderedDict from the collections module, which is an ordered dictionary. If it has the added functionality of being orderable, which I realize may often not be necessary but even so, are there any downsides? Is it slower? Is it missing any functionality? I didn't see any missing methods. In short, why shouldn't I always use this instead of a normal dictionary? OrderedDict is a subclass of dict , and needs more memory to keep track of the order in which keys are added. This isn't trivial. The implementation adds a second dict under the covers, and a doubly-linked list of

How to sort OrderedDict of OrderedDict - Python

由 强颜欢笑 提交于 2019-11-27 02:13:55
I'm trying to sort OrderedDict in OrderedDict by 'depth' key. Is there any solution to sort that Dictionary ? OrderedDict([ (2, OrderedDict([ ('depth', 0), ('height', 51), ('width', 51), ('id', 100) ])), (1, OrderedDict([ ('depth', 2), ('height', 51), ('width', 51), ('id', 55) ])), (0, OrderedDict([ ('depth', 1), ('height', 51), ('width', 51), ('id', 48) ])), ]) Sorted dict should look like this: OrderedDict([ (2, OrderedDict([ ('depth', 0), ('height', 51), ('width', 51), ('id', 100) ])), (0, OrderedDict([ ('depth', 1), ('height', 51), ('width', 51), ('id', 48) ])), (1, OrderedDict([ ('depth',

Any way to properly pretty-print ordered dictionaries?

由 早过忘川 提交于 2019-11-27 00:05:00
问题 I like the pprint module in Python. I use it a lot for testing and debugging. I frequently use the width option to make sure the output fits nicely within my terminal window. It has worked fine until they added the new ordered dictionary type in Python 2.7 (another cool feature I really like). If I try to pretty-print an ordered dictionary, it doesn't show nicely. Instead of having each key-value pair on its own line, the whole thing shows up on one long line, which wraps many times and is

Override the {…} notation so i get an OrderedDict() instead of a dict()?

由 喜欢而已 提交于 2019-11-26 23:58:36
I want to use a .py file like a config file. So using the {...} notation I can create a dictionary using strings as keys but the definition order is lost in a standard python dictionary. My question: is it possible to override the {...} notation so that I get an OrderedDict() instead of a dict() ? I was hoping that simply overriding dict constructor with OrderedDict ( dict = OrderedDict ) would work, but it doesn't. Eg: dict = OrderedDict dictname = { 'B key': 'value1', 'A key': 'value2', 'C key': 'value3' } print dictname.items() Output: [('B key', 'value1'), ('A key', 'value2'), ('C key',

Dictionary sorting by key length

由 梦想与她 提交于 2019-11-26 22:05:00
问题 Anyone have any idea how to sort this dictionary by key length? { 'http://ccc.com/viewvc/' : [{'type': 'web-servers', 'app': 'Apache', 'ver': '2.2.14'}, {'type': 'operating-systems', 'app': 'Ubuntu', 'ver': None}], 'http://bbb.com/' : [{'type': 'web-servers', 'app': 'Apache', 'ver': '2.2.22'}, {'type': 'programming-languages', 'app': 'PHP', 'ver': '5.3.10'}, {'type': 'cms', 'app': 'Drupal', 'ver': None}, {'type': 'operating-systems', 'app': 'Ubuntu', 'ver': None}, {'type': 'javascript

OrderedDictionary and Dictionary

由 ﹥＞﹥吖頭↗ 提交于 2019-11-26 19:26:56
问题 I was looking for a way to have my Dictionary enumerate its KeyValuePair in the same order that they were added. Now, Dictionary's documentation clearly states that: For purposes of enumeration, each item in the dictionary is treated as a KeyValuePair<TKey, TValue> structure representing a value and its key. The order in which the items are returned is undefined. I found out that what I needed was an OrderedDictionary , but being the sceptic that I am, I decided to try it myself:

Right way to initialize an OrderedDict using its constructor such that it retains order of initial data?

由 一曲冷凌霜 提交于 2019-11-26 15:36:45
问题 What's the correct way to initialize an ordered dictionary (OD) so that it retains the order of initial data? from collections import OrderedDict # Obviously wrong because regular dict loses order d = OrderedDict({'b':2, 'a':1}) # An OD is represented by a list of tuples, so would this work? d = OrderedDict([('b',2), ('a', 1)]) # What about using a list comprehension, will 'd' preserve the order of 'l' l = ['b', 'a', 'c', 'aa'] d = OrderedDict([(i,i) for i in l]) Question: Will an OrderedDict

No generic implementation of OrderedDictionary?

由 不想你离开。 提交于 2019-11-26 12:12:21
There doesn't appear to be a generic implementation of OrderedDictionary (which is in the System.Collections.Specialized namespace) in .NET 3.5. Is there one that I'm missing? I've found implementations out there to provide the functionality, but wondered if/why there isn't a generic implementation out-of-the-box and if anyone knows whether it's something in .NET 4.0? LukeH You're right. There's no generic equivalent of OrderedDictionary in the framework itself. (That's still the case for .NET 4 too, as far as I'm aware.) But you can vote for it at Visual Studio's UserVoice (2016-10-04)!

Accessing items in an collections.OrderedDict by index

由 淺唱寂寞╮ 提交于 2019-11-26 11:54:02
问题 Lets say I have the following code: import collections d = collections.OrderedDict() d[\'foo\'] = \'python\' d[\'bar\'] = \'spam\' Is there a way I can access the items in a numbered manner, like: d(0) #foo\'s Output d(1) #bar\'s Output 回答1: If its an OrderedDict() you can easily access the elements by indexing by getting the tuples of (key,value) pairs as follows >>> import collections >>> d = collections.OrderedDict() >>> d['foo'] = 'python' >>> d['bar'] = 'spam' >>> d.items() [('foo',

Are there any reasons not to use an OrderedDict?

由 我只是一个虾纸丫 提交于 2019-11-26 10:25:58
问题 I\'m referring to the OrderedDict from the collections module, which is an ordered dictionary. If it has the added functionality of being orderable, which I realize may often not be necessary but even so, are there any downsides? Is it slower? Is it missing any functionality? I didn\'t see any missing methods. In short, why shouldn\'t I always use this instead of a normal dictionary? 回答1: OrderedDict is a subclass of dict , and needs more memory to keep track of the order in which keys are
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