Recent questions tagged dictionary

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dictionary - Unexpected Data Assignment in Python Nested Dictionaries

I am new to python so please excuse any dumb mistakes but after research, I can't figure this out. I am creating a ... 'Clean': 'Bill'}} etc... See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dictionary - Mutability of the **kwargs argument in Python

Consider a case where I change the kwargs dict inside a method: def print_arg(**kwargs): print kwargs.pop('key ... lets mydict change or not. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dictionary - How do I make Maps and lambdas work with a matrix in python 3.4?

I often avoid me to write posts like this but I'm new in python 3.4 and I need a help with this code ... though. Does someone have some idea? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dictionary - How to check if Javascript Map has an object key

Looking at a couple of different docs, all I see is when the Map (ECMAScript6) key is a boolean ... /JavaScript/Reference/Global_Objects/Map/has See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dictionary - Why inserting 1000 000 values in a transient map in Clojure yields a map with 8 items in it?

If I try to do 1000 000 assoc! on a transient vector, I'll get a vector of 1000 000 elements (count ( ... there a reason why this is happening? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dictionary - How much memory do golang maps reserve?

Given a map allocation where the initial space is not specified, for example: foo := make(map[string]int) The ... is allocating to this map? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dictionary - getting the key index in a Python OrderedDict?

I have a collections.OrderedDict with a list of key, value pairs. I would like to compute the index i such ... built in to an OrderedDict. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dictionary - How to generate all combination from values in dict of lists in Python

I would like to generate all combinations of values which are in lists indexed in a dict: {'A':['D', ... quite stuck with this nested structure. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dictionary - How can I modify/merge Jinja2 dictionaries?

I have a Jinja2 dictionary and I want a single expression that modifies it - either by changing its content ... Jinja2 and Python are analogous. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dictionary - What are PostScript dictionaries, and how can they be accessed (via Ghostscript)?

I usually look at ghostscript as a command line tool; however, I never cease to be amazed at the sheer ... and possibly) modify this data? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dictionary - How to convert a Kotlin data class object to map?

Is there any easy way or any standard library method to convert a Kotlin data class object to a map/dictionary ... ? Can reflection be avoided? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dictionary - Java 8 list to map with stream

I have a List<Item> collection. I need to convert it into Map<Integer, Item> The key of the map must be the ... list and put it as a key value See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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761 views

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dictionary - Chained, nested dict() get calls in python

I'm interrogating a nested dictionary using the dict.get('keyword') method. Currently my syntax is... M = ... ) call to terminate my program. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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869 views

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dictionary - Group by and aggregate the values of a list of dictionaries in Python

I'm trying to write a function, in an elegant way, that will group a list of dictionaries and ... new_dataset.append(d) return new_dataset See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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655 views

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dictionary - python dict: get vs setdefault

The following two expressions seem equivalent to me. Which one is preferable? data = [('a', 1), ( ... faster and therefore preferable. Opinions? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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514 views

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dictionary - explicit and implicit c#

I'm new to C# and learning new words. I find it difficult to understand what's the meaning of these two ... this sentence here trying to say. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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533 views

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dictionary - How to convert List to Map in Kotlin?

For example I have a list of strings like: val list = listOf("a", "b", "c", "d") and I want to ... and I haven't seen any examples of 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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422 views

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dictionary - Create an Android GPS tracking application

Recently, I've taken up android development as a hobby and was looking to develop an application that can ... be greatly appreciated Thanks. See Question&Answers more detail:os...

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

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432 views

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dictionary - Python dict to DataFrame Pandas

I need help for getting a pandas DataFrame from a dict like this one (2 levels): {u'instrument': u'EUR_USD ... , lowMid,Volume, OpenMid, time. See Question&Answers more detail:os...

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

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506 views

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dictionary - Why Map does not work for GString in Groovy?

With the following snippet I cannot retrieve gString from a map: def contents = "contents" def gString = " ... not mix String with GString. See Question&Answers more detail:os...

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

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924 views

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dictionary - Is Scala mapValues lazy?

When I call System.err.println("Before") System.err.flush() val foo: Map[Int, T] = t mapValues (fn(_) ... - unless mapValues creates a lazy map? See Question&Answers more detail:os...

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

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574 views

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dictionary - Check if key exists in multiple maps in one condition

I need to check if the same key exists in two maps: if v1, ok1 := map1["aaa"]; ok1 { ... } if v2 ... checking) can be done in one if condition. See Question&Answers more detail:os...

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

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619 views

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dictionary - Why are iterations over maps random?

From the Golang source code, they seem to follow a pretty standard implementation of hash tables (ie array of ... make the iteration random? See Question&Answers more detail:os...

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

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575 views

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dictionary - why slice values can sometimes go stale but never map values?

I find that slice map function and channel are frequently mentioned together as reference types. However I notice that ... make slice this 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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665 views

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dictionary - Will a Python dict literal be evaluated in the order it is written?

Let's say that I've got a situation like this in Python: _avg = {'total':0.0, 'count':0} # HACK: side- ... ['key1'] always be 1.0 as asserted? See Question&Answers more detail:os...

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

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404 views

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dictionary - ruby using the "&:methodname" shortcut from array.map(&:methodname) for hash key strings rather than methodname

Most ruby developers know how to save a few keystrokes by doing something like this: array.map(&:methodname) ... Road Northwest, Shallotte"}] See Question&Answers more detail:os...

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

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765 views

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dictionary - Selecting random key and value sets from a Map in Java

I want to get random keys and their respective values from a Map. The idea is that a random generator would pick a ... .put("Geddy", "Lee"). See Question&Answers more detail:os...

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

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647 views

1 answer

dictionary - How can I get a key in a JavaScript 'Map' by its value?

I have a JavaScript 'Map' like this one let people = new Map(); people.set('1', 'jhon'); people.set('2', ' ... 'jhon'); // jhonKey should be '1' See Question&Answers more detail:os...

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

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