56
votes
4
answers
1.1K
views
Convert Linq Query Result to Dictionary
I want to add some rows to a database using Linq to SQL, but I want to make a "custom check" before adding the
58
votes
16
answers
506
views
54
votes
20
answers
1.4K
views
How can I add new keys to a dictionary?
Is it possible to add a key to a Python dictionary after it has been created? It doesn't seem to have an
64
votes
30
answers
720
views
57
votes
14
answers
1.9K
views
Iterating over dictionaries using 'for' loops
I am a bit puzzled by the following code: d = {'x': 1, 'y': 2, 'z': 3} for key
59
votes
30
answers
2.5K
views
How do I merge two dictionaries in a single expression (taking union of dictionaries)?
I have two Python dictionaries, and I want to write a single expression that returns these two dictionaries, m
60
votes
6
answers
2.1K
views
Why is std::map implemented as a red-black tree?
Why is std::map implemented as a red-black tree? There are several balanced binary search trees (BSTs) out th
51
votes
21
answers
1K
views
What is the best way to implement nested dictionaries?
I have a data structure which essentially amounts to a nested dictionary. Let's say it looks like this:
61
votes
12
answers
455
views
What is the difference between a map and a dictionary?
I know a map is a data structure that maps keys to values. Isn't a dictionary the same? What is the diffe
55
votes
11
answers
1.4K
views
65
votes
12
answers
1.3K
views
In Python, when to use a Dictionary, List or Set?
When should I use a dictionary, list or set? Are there scenarios that are more suited for each data type?
60
votes
3
answers
458
views
How are Python's Built In Dictionaries Implemented?
Does anyone know how the built in dictionary type for python is implemented? My understanding is that it is s
63
votes
13
answers
2.8K
views
How can I remove a key from a Python dictionary?
When deleting a key from a dictionary, I use: if 'key' in my_dict: del my_dict['key']
60
votes
18
answers
1K
views
How do I sort a list of dictionaries by a value of the dictionary?
I have a list of dictionaries and want each item to be sorted by a specific value. Take into consideration the
51
votes
30
answers
704
views
Sort a Map<Key, Value> by values
I am relatively new to Java, and often find that I need to sort a Map<Key, Value> on the values. Since
67
votes
30
answers
833
views
How do I efficiently iterate over each entry in a Java Map?
If I have an object implementing the Map interface in Java and I wish to iterate over every pair contained wit
