To enumerate a dictionary you either enumerate the values within it: Dictionary<int, string> dic; foreach(string s in dic.Values) { Console.WriteLine(s); } or the KeyValuePairs foreach(KeyValuePair<int, string> kvp in dic) { Console.WriteLine(“Key : ” + kvp.Key.ToString() + “, Value : ” + kvp.Value); } or the keys foreach(int key in dic.Keys) { Console.WriteLine(key.ToString()); } If you … Read more
A dictionary is not the appropriate data structure for the operations you are describing. If the intervals are required to never overlap then you can just build a sorted list of intervals and binary search it. If the intervals can overlap then you have a more difficult problem to solve. To solve that problem efficiently … Read more
No. First of all, Dictionary [UPDATED] uses hash code of the keys to find them in its internal storage – rather than the keys. And Hashcode is an int. For int, it is just the value of the int, for string it has to be generated. So using int is slightly faster. In fact generating … Read more
JSON objects are maps of strings to values. If you try to use another type of key, they’ll get converted to strings. >>> json.loads(json.dumps({123: None})) {‘123’: None} >>> json.loads(json.dumps({None: None})) {‘null’: None}
dicts (just like sets when you don’t need to associate a value to each key but simply record if a key is present or absent) are pretty heavily optimized. Creating a dict from N keys or key/value pairs is O(N), fetching is O(1), putting is amortized O(1), and so forth. Can’t really do anything substantially … Read more
There is a clean method from your map object to close all open popups map.closePopup();
As of Python 3.7, a new improvement to the dict built-in is: the insertion-order preservation nature of dict objects has been declared to be an official part of the Python language spec. This means there is no real need for OrderedDict anymore 🎉. They are almost the same. Some minor details to consider… Here are … Read more
Dictionary<TKey, TValue> uses an IEqualityComparer<TKey> for comparing the keys. If you do not explicitly specify the comparer when you construct the dictionary, it will use EqualityComparer<TKey>.Default. Since neither MyClass nor MyStruct implement IEquatable<T>, the default equality comparer will call Object.Equals and Object.GetHashCode for comparing instances. MyClass is derived from Object, so the implementation will use … Read more
Python 3.8 or newer: Use sort_dicts=False: pprint.pprint(data, sort_dicts=False) Python 3.7 or older: You can monkey patch the pprint module. import pprint pprint.pprint({“def”:2,”ghi”:3,”abc”:1,}) pprint._sorted = lambda x:x # Or, for Python 3.7: # pprint.sorted = lambda x, key=None: x pprint.pprint({“def”:2,”ghi”:3, “abc”:1}) Since the 2nd output is essentiallly randomly sorted, your output may be different from mine: … Read more
Using the colon in an indexing operation generates a slice object, which is not hashable.