Assuming you’re using .NET 3.5, you can turn any sequence (i.e. IEnumerable<T>) into a dictionary: var dictionary = sequence.ToDictionary(item => item.Key, item => item.Value) where Key and Value are the appropriate properties you want to act as the key and value. You can specify just one projection which is used for the key, if the …
A modern and fast solution, for Python 3.7. May also work in some interpreters of Python 3.6. TLDR To sort a dictionary by keys use: sorted_dict = {k: disordered[k] for k in sorted(disordered)} Almost three times faster than the accepted answer; probably more when you include imports. Comment on the accepted answer The example in …
Another approach would be to have an array of objects, with each individual object holding the properties of a column. This slightly changes the structure of “myMappings”, but makes it easy to work with: var myMappings = [ { title: “Name”, width: “10%” }, { title: “Phone”, width: “10%” }, { title: “Address”, width: “50%” …
>>> d = {“foo”: 12, “bar”: 2, “jim”: 4, “bob”: 17} >>> [k for k, v in d.items() if v > 6] # Use d.iteritems() on python 2.x [‘bob’, ‘foo’] I’d like to just update this answer to also showcase the solution by @glarrain which I find myself tending to use nowadays. [k for k …
This might do the trick: apply Lloyd’s algorithm to get k centroids. Sort the centroids by descending size of their associated clusters in an array. For i = 1 through k-1, push the data points in cluster i with minimal distance to any other centroid j (i < j ≤ k) off to j and …
key: is parsed as null – %YAML 1.1 — !!map { ? !!str “key” : !!null “null”, } The correct answer is: key: “”
They way I understand it, references are implemented as pointers under the hood. The reason why you can’t store them in a map is purely semantic; you have to initialize a reference when it’s created and you can’t change it afterward anymore. This doesn’t mesh with the way a map works.
ListMap implements an immutable map using a list-based data structure, and thus preserves insertion order. scala> import collection.immutable.ListMap import collection.immutable.ListMap scala> ListMap(1 -> 2) + (3 -> 4) res31: scala.collection.immutable.ListMap[Int,Int] = Map(1 -> 2, 3 -> 4) scala> res31 + (6 -> 9) res32: scala.collection.immutable.ListMap[Int,Int] = Map(1 -> 2, 3 -> 4, 6 -> 9) …
We have a slightly different take on this, but the effect is similar: public static TValue GetOrCreate<TKey, TValue>(this IDictionary<TKey, TValue> dict, TKey key) where TValue : new() { if (!dict.TryGetValue(key, out TValue val)) { val = new TValue(); dict.Add(key, val); } return val; } Called: var dictionary = new Dictionary<string, List<int>>(); List<int> numbers = dictionary.GetOrCreate(“key”); …