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1. Top results related to is a list of keyvaluepair a dictionary definition

   • Is a member initializer list part of the declaration or the definition of a constructor?

     Top Answer

     Answered Jun 11, 2023 · 27 votes

     This is the initializer list:

     Example::Example( int size, int grow_by) : m_size(5), m_top(-1){ /* ... */}-

     and it should be done only in the .cpp file.

     If you did it in the header like in your example, you would get an error.

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     1/5

   • Is there a Pythonic way of adding float values of one dictionary to a list of values in another dictionary?

     Top Answer

     Answered Feb 21, 2021 · 6 votes

     Use dictionary comprehension

     { k: [x + dictB.get(k,0) for x in l] for k, l in dictA.items() }-

     Output

     {20: [0.9, 1.4, 0.9], 25: [1.0, 1.5, 1.0]}

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     2/5

   • Is it better to store data in a list of tuples or a dictionary?

     Top Answer

     Answered Oct 11, 2013 · 4 votes

     If you are trying to associate something to something else, then a dictionary is probably what you want. It is faster, and, well, the right tool for the job.

     Example usage:

     dictionary = {'o': (5.3, 7), 'k': (5, 9.2)} # Don't use dict as a variable name, it's a built-in-print(dictionary['o'])# (5.3, 7)print(dictionary['k'][1]))# 9.2

     I have replaced your lists with tuples. This saves a bit of memory (presuming you don't want to in the future associate different numbers with the letters.

     However, a dictionary would not preserve the order of the letters, but it doesn't seem like you need this.

     Although if all you need to do is check if a number is associated with a letter, you could optimize further, and use sets.

     dictionary = {'o': {5.3, 7}, 'k': {5, 9.2}}-print(7 in dictionary['o'])# True

     However, sets don't preserve ordering.

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     3/5

   • Check if a word is in a list that is a value of a dictionary

     Top Answer

     Answered Dec 03, 2017 · 3 votes

     Your code checks if element ('noodles') is a value in the dictionary, and it isn't (the values are lists).

     You need to check if element is inside every list.

     If you don't care for the key:

     print(any(element in value for value in myDict.values()))-

     If you want to know the key (this will print a list of matching keys):

     print([key for key, value in myDict.items() if element in value])-

     But, generally speaking, if you find yourself having to loop over a dictionary over and over again, you either made a bad choice for what are the keys, or using the wrong data structure altogether.

     Other Answers

     Answered Dec 03, 2017 · 1 votes

     The dict.values() call here returns an iterable of lists. You'll need to flatten the returned iterable first, to test directly:

     from itertools import chain-element = 'noodles'print(element in chain.from_iterable(my_dict.values())) # -> True

     Other Answers

     Answered Dec 03, 2017 · 1 votes

     You should use a function here , You can do with pure python without importing any module or making it more complicated :

     Data:

     Your_dict={1:['hello', 'hallo', 'salut', 'ciao', 'hola'], 2:['eggs', 'noodles', 'bacon']}your_word='noodles'

     code:

     def find(dict_1,word): for words in dict_1.values(): if word in words: return True else: return Falseprint(find(Your_dict,your_word))

     output:

     True-

     One line solution without any for loop or module :

     Just for fun

     print(list(map(lambda x:x if your_word in x else None,Your_dict.values())))-

     output:

     [None, ['eggs', 'noodles', 'bacon']]-

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     4/5

   • a column definition list is required for functions returning "record"

     Top Answer

     Answered May 10, 2016 · 7 votes

     Problem solved! Actually the problem is in another function, where I call transformServers(json).

     Each time we call a function which returns setof record, we need to specify the columns, so when we call transformServers(json) we have to do it as

     select * from transformServers(json) as f(id bigint, hostname text) -

     Before, I did

     select * from transformServers(json)-

     which does not work.

     Check all answers on Stack Overflow

     5/5

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2. stackoverflow.com › questions › 1769053When would you use a List<KeyValuePair<T1, T2>> instead of a ...

   stackoverflow.com › questions › 1769053

   • Cached

   Nov 20, 2009 · Dictionary is fast for lookup operations, because is using hash function internally. That means, all the keys must be unique in dictionary. Consider this examples: List<KeyValuePair<int, string>> pairs = new List<KeyValuePair<int, string>>(); pairs.Add(new KeyValuePair<int, string>(1, "Miroslav"));

   Code sample

   List<KeyValuePair<int, string>> pairs = new List<KeyValuePair<int, string>>();

   pairs.Add(new KeyValuePair<int, string>(1, "Miroslav"));

   pairs.Add(new KeyValuePair<int, string>(2, "Naomi"));

   pairs.Add(new KeyValuePair<int, string>(2, "Ingrid"));

   Dictionary<int, string> dict = new Dictionary<int, string>();...

   See more on stackoverflow

3. stackoverflow.com › questions › 905424c# - KeyValuePair VS DictionaryEntry - Stack Overflow

   stackoverflow.com › questions › 905424

   • Cached

   Apr 17, 2015 · 3 Answers. Sorted by: 125. KeyValuePair<TKey,TValue> is used in place of DictionaryEntry because it is generified. The advantage of using a KeyValuePair<TKey,TValue> is that we can give the compiler more information about what is in our dictionary.

4. People also ask

   How do you use a KeyValuePair in a dictionary?

   • Foreach, Dictionary. A common use of KeyValuePair is in a loop over a Dictionary. The Dictionary has an enumerator that returns each key and value in a KeyValuePair, one at a time. Detail For simpler and shorter syntax, we can use the var keyword with the foreach-loop over the Dictionary.

   C# KeyValuePair Examples - Dot Net Perls

   www.dotnetperls.com/keyvaluepair

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   How to use KeyValuePair in JavaScript?

   • A common use of KeyValuePair is in a loop over a Dictionary. The Dictionary has an enumerator that returns each key and value in a KeyValuePair, one at a time. Detail For simpler and shorter syntax, we can use the var keyword with the foreach-loop over the Dictionary. Sort, lambda. To sort KeyValuePairs, we can use Comparison methods.

   C# KeyValuePair Examples - Dot Net Perls

   www.dotnetperls.com/keyvaluepair

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   What is the difference between list and KeyValuePair in C#?

   • Here’s a breakdown of the syntax: List<>: This is a generic collection type in C# that represents a list. It allows you to store and manipulate a collection of items of a specific type. KeyValuePair : This is a data structure that holds a pair of values - a key of type string and a value of type int.

   Key-Value Pair List in C# | Delft Stack

   www.delftstack.com/howto/csharp/csharp-key-value-pair-list/

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   What is a key-value pair list?

   • At its core, a key-value pair list associates a unique key with a specific value. The key acts as an identifier, allowing rapid access to the associated value. This structure is crucial in various programming tasks, ranging from data storage and retrieval to organizing information in dictionaries and associative arrays.

   Key-Value Pair List in C# | Delft Stack

   www.delftstack.com/howto/csharp/csharp-key-value-pair-list/

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5. stackoverflow.com › questions › 11390561c# - Select Value of List of KeyValuePair - Stack Overflow

   stackoverflow.com › questions › 11390561

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   Jul 9, 2012 · myList.First(kvp => kvp.Key == 5).Value. Or if you want to use a dictionary (which might suit your needs better than the list as stated in the other answers) you can convert your list to a dictionary easily: var dictionary = myList.ToDictionary(kvp => kvp.Key); var value = dictionary[5].Value;

6. www.dotnetperls.com › keyvaluepairC# KeyValuePair Examples - Dot Net Perls

   www.dotnetperls.com › keyvaluepair

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   Mar 31, 2023 · Foreach, Dictionary. A common use of KeyValuePair is in a loop over a Dictionary. The Dictionary has an enumerator that returns each key and value in a KeyValuePair, one at a time.

7. www.delftstack.com › csharp-key-value-pair-listKey-Value Pair List in C# | Delft Stack

   www.delftstack.com › csharp-key-value-pair-list

   • Cached

   Dec 14, 2023 · At its core, a key-value pair list associates a unique key with a specific value. The key acts as an identifier, allowing rapid access to the associated value. This structure is crucial in various programming tasks, ranging from data storage and retrieval to organizing information in dictionaries and associative arrays.

8. www.webdevtutor.net › blog › csharp-convertC# Convert KeyValuePair to Dictionary: A Practical Guide

   www.webdevtutor.net › blog › csharp-convert

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   Feb 21, 2024 · Method 1: Using ToDictionary () The ToDictionary() LINQ extension method provides a concise way to convert a sequence of key-value pairs to a dictionary. Here's an example: using System; using System.Collections.Generic; using System.Linq; class Program . { static void Main() . { // Creating a List of KeyValuePairs .

9. learn.microsoft.com › en-us › dotnetDictionary<TKey,TValue> Class (System.Collections.Generic)

   learn.microsoft.com › en-us › dotnet

   • Cached

   Since the Dictionary<TKey,TValue> is a collection of keys and values, the element type is not the type of the key or the type of the value. Instead, the element type is a KeyValuePair<TKey,TValue> of the key type and the value type. For example: