Recent questions tagged dictionary

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dictionary - Mapping a function on the values of a map in Clojure

I want to transform one map of values to another map with the same keys but with a function applied to the values ... with a nicer name too). See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dictionary - insert vs emplace vs operator[] in c++ map

I'm using maps for the first time and I realized that there are many ways to insert an element. You can ... wasn't possible before without it? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dictionary - Intersection of java.util.Map

Is there a method in java.util.Map or any util to perform an intersection on two maps? (To intersect two maps ... .* classes that would do this. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dictionary - How do I compare two dictionaries in Swift?

Is there an easy way to compare two [String: AnyObject] dictionaries in swift, since it doesn't accept the == ... key they have the same values. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dictionary - Hashtable with MultiDimensional Key in C#

I'm basically looking for a way to access a hashtable value using a two-dimensional typed key in c#. Eventually I ... = test[temp].ToString(); See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dictionary - python tuple to dict

For the tuple, t = ((1, 'a'),(2, 'b')) dict(t) returns {1: 'a', 2: 'b'} Is there a good ... , perhaps converting to a dict is not the best way. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dictionary - How to get memory size of variable in Go?

I am curious about the memory cost of map and slice, so I wrote a program to compare the sizes. I get the memory ... %d ", unsafe.Sizeof(m)) } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dictionary - Python variables as keys to dict

Is there an easier way to do this in Python (2.7)?: Note: This isn't anything fancy, like putting all local variables ... x] = x # (Won't work) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dictionary - Print doesn't print when it's in map, Python

primes = [2,3,5,7..] (prime numbers) map(lambda x:print(x),primes) It does not print anything. Why is that? ... x) too, but doesn't work either. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dictionary - How to get the difference between two dictionaries in Python?

I have two dictionaries, and I need to find the difference between the two, which should give me both a key and a ... keys, and I need to also get the values. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dictionary - Java - How to create new Entry (key, value)

I'd like to create new item that similarly to Util.Map.Entry that will contain the structure key, value. The ... a new generic key/value object for Map.Entry? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dictionary - Swagger: map of <string, Object>

I need to document with Swagger an API that uses, both as input and output, maps of objects, indexed by string ... there a better way to achieve what I need? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dictionary - How to iterate (keys, values) in JavaScript?

I have a dictionary that has the format of dictionary = {0: {object}, 1:{object}, 2:{object}} How can I ... key would be 0 and value would be the object } Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dictionary - What is the default constructor for C++ pointer?

I have code like this: class MapIndex { private: typedef std::map<std::string, MapIndex*> Container; ... an invalid pointer pointing somewhere in the memory? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dictionary - Comparing Python dictionaries and nested dictionaries

I know there are several similar questions out there, but my question is quite different and difficult for me. I ... matched" else: print "sorry no match found" Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dictionary - Multiple levels of 'collection.defaultdict' in Python

Thanks to some great folks on SO, I discovered the possibilities offered by collections.defaultdict, notably ... Any more elegant suggestion? Thanks pythoneers! Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dictionary - How to initialize a dict with keys from a list and empty value in Python?

I'd like to get from this: keys = [1,2,3] to this: {1: None, 2: None, 3: None} Is there a pythonic way of ... None]*len(keys))) {1: None, 2: None, 3: None} Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dictionary - I'm getting Key error in python

In my python program I am getting this error: KeyError: 'variablename' From this code: path = meta_entry[' ... Can anyone please explain why this is happening? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dictionary - What is the difference between the HashMap and Map objects in Java?

What is the difference between the following maps I create (in another question, people answered using them seemingly ... = new HashMap<String, Object>(); Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dictionary - How to define hash tables in Bash?

What is the equivalent of Python dictionaries but in Bash (should work across OS X and Linux). Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dictionary - Java LinkedHashMap get first or last entry

I have used LinkedHashMap because it is important the order in which keys entered in the map. But now I want ... ? That is why I used LinkedHashMap! Thanks! Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dictionary - Converting Python dict to kwargs?

I want to build a query for sunburnt(solr interface) using class inheritance and therefore adding key - value pairs ... ) into keyword arguments (type='Event')? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dictionary - How to find if a given key exists in a C++ std::map

I'm trying to check if a given key is in a map and somewhat can't do it: typedef map<string,string>::iterator mi ... error here so how can I print what is in p? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dictionary - Why doesn't a python dict.update() return the object?

I 'm trying to do : award_dict = { "url" : "http://facebook.com", "imageurl" : "http://farm4.static. ... to do chaining. Why isn't it acceptable in python? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dictionary - A Regex that will never be matched by anything

This might sound like a stupid question, but I had a long talk with some of my fellow developers and it sounded ... reason for this "not a real question"... Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dictionary - In Python, how can you load YAML mappings as OrderedDicts?

I'd like to get PyYAML's loader to load mappings (and ordered mappings) into the Python 2.7+ OrderedDict type, instead ... uses. What's the best way to do that? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dictionary - Performance of key lookup in JavaScript object

I just read this question: are there dictionaries in javascript like python? One of the answers said that you ... to the object also constant time (hashing)? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dictionary - IDictionary<TKey, TValue> in .NET 4 not covariant

The IDictionary<TKey, TValue> in .NET 4 / Silverlight 4 does not support covariance, i.e. I can't do ... , which arguably looks like a quite messy approach. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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