Recent questions tagged Dictionary

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dictionary - To merge two dictionaries of list in Python

There are two dictionaries x={1:['a','b','c']} y={1:['d','e','f'],2:['g']} I want another dictionary z which is a ... {1:['d','e','f'],2:['g']} See Question&Answers more detail:os...

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

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873 views

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dictionary - python delete dict keys in list comprehension

Why is the following expression, aiming at deleting multiple keys in a dict, invalid? (event is a dict) [del ... expression to replace it with? See Question&Answers more detail:os...

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

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641 views

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dictionary - Do Python dict literals and dict(list of pairs) keep their key order?

Do dict literals keep the order of their keys, in Python 3.7+? For example, is it guaranteed that {1: "one", ... the list given to dict(), 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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631 views

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dictionary - D3.geo : responsive frame given a geojson object?

I use Mike Bostock's code to Center a map in d3 given a geoJSON object. The important part of the code is this: ... a 5% margin on each size ? See Question&Answers more detail:os...

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

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698 views

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dictionary - Why can't Go slice be used as keys in Go maps pretty much the same way arrays can be used as keys?

Why can't Go slice (which is an implementation of Go arrays) be used as keys in Go maps pretty much the same way arrays can be used as keys? 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 - Typescript Map<enum, set<enum>> "No overload matches this call", but I don't get why?

I am creating a boardgame in Typescript. In it I declare the following: export enum PieceType { PAWN, ... understand how this is possible? See Question&Answers more detail:os...

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

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694 views

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dictionary - Get all values from nested dictionaries in python

I have some dictionaries of dictionaries, like this: a['b']['c']['d']['answer'] = answer1 a['b']['c']['e'][' ... x in a['b']['c'].values()] 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 - R: Error in get_map()/get_googlemap() from ggmap

I am trying to use GGmap to create a plot of vehicle car crashes by state. The map will have dots which ... any more information. Thank you. 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 - Unexpected floating-point representations in Python

Hello I am using a dictionary in Python storing some cities and their population like that: population = { 'Shanghai' ... as far as I know. See Question&Answers more detail:os...

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

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743 views

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dictionary - Can not assign to pair in a map

I have the following pair defined in my go program type pair struct { a float64 b float64 } Then I create a map ... what's the reason for this? See Question&Answers more detail:os...

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

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932 views

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dictionary - Can marshalling a map[string]string to json return an error?

Say I have the following code: m := map[string]string{} //... do stuff to the map b, err := json. ... to worry about that error check at all. See Question&Answers more detail:os...

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

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670 views

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dictionary - Will a Python dict with integers as keys be naturally sorted?

If I create a Python dict which uses integers as keys, can I safely assume that iterating over the dict will ... list in order of 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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830 views

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dictionary - How to collect Stream<Map<K,V>> into Map<K,List<V>> using java 8?

I have a stream of Map<String,Double> that I want to collect into a single Map<String,List<Double>>. Does anybody ... on how to do this? Thanks! See Question&Answers more detail:os...

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

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513 views

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dictionary - Check if a value is in a list

Does Go have something similar to Python's in keyword? I want to check if a value is in a list. For ... this using go generate or something? See Question&Answers more detail:os...

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

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704 views

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dictionary - Is there an in-place equivalent to 'map' in python?

I have a list of strings that I need to sanitize. I have a method for sanitizing them, so I could just do: ... , but is there anything built in? See Question&Answers more detail:os...

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

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635 views

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dictionary - How to do associative array/hashing in JavaScript

I need to store some statistics using JavaScript in a way like I'd do it in C#: Dictionary<string, int> ... store values in such a way? See Question&Answers more detail:os...

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

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1.3k views

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dictionary - The operator '[]' isn't defined for the class 'Object'. Dart

I have a Widget which on some point navigate to a different page. like:- Navigator.of(context).pushNamed( NextPage. ... do I remove this error? See Question&Answers more detail:os...

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

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608 views

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dictionary - How to handle hash collisions for Dictionaries in Swift

TLDR My custom structure implements the Hashable Protocol. However, when hash collisions occur while inserting keys ... hash collision occurs? See Question&Answers more detail:os...

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

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582 views

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dictionary - Counting occurrences of a key in a Map in Java

I'm writing a project that captures Java keywords from a .java file and keeps track of the occurrences with ... Any help is greatly appreciated! See Question&Answers more detail:os...

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

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773 views

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dictionary - How to increment a value in Java Stream?

I want to increment value of index with the each iteration by 1. Easily to be achieved in the for-loop. The ... variable index to be used in? See Question&Answers more detail:os...

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

0 votes

670 views

1 answer

dictionary - Do Python dict literals and dict(list of pairs) keep their key order?

Do dict literals keep the order of their keys, in Python 3.7+? For example, is it guaranteed that {1: "one", ... the list given to dict(), etc. See Question&Answers more detail:os...

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

0 votes

582 views

1 answer

dictionary - How do quickly search through a .csv file in Python

I'm reading a 6 million entry .csv file with Python, and I want to be able to search through this file ... could I implement that into Python? See Question&Answers more detail:os...

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

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584 views

1 answer

dictionary - Using XSLT to translate an XML file

I want to translate a given XML file (it is a RelaxNG grammar) to other languages via XSLT. Suppose the XML file ... name="Stuhl" /> </grammar> See Question&Answers more detail:os...

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

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982 views

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dictionary - Are javascript object keys case sensitive?

I was trying to fix duplicate items in an array on javascript by the means of object keys. The loop ... Javascript object not case sensitive ? See Question&Answers more detail:os...

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

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709 views

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dictionary - Efficient way to filter a Map by value in Elixir

In Elixir, what would be an efficient way to filter a Map by its values. Right now I have the following ... would be a more efficient solution? See Question&Answers more detail:os...

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

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642 views

1 answer

dictionary - Java 8 stream join and return multiple values

I'm porting a piece of code from .NET to Java and stumbled upon a scenario where I want to use stream ... that resembles more like C# than java See Question&Answers more detail:os...

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

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666 views

1 answer

dictionary - OrderedDict vs Dict in python

In Tim Peter's answer to "Are there any reasons not to use an ordered dictionary", he says OrderedDict is a subclass ... of 3: 1.23 ms per loop See Question&Answers more detail:os...

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

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569 views

1 answer

dictionary - Using string object as a hash key in Common Lisp

I'm trying to create a "dictionary" type - ie hash table with a string as a key. Is this possible or wise in ... > (gethash "one" table) NIL NIL See Question&Answers more detail:os...

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

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