Arrays in Swift support the += operator to add the contents of one Array to another. Is there an easy way to do that for a dictionary? eg: var dict1 = [“a” : “foo”] var dict2 = [“b” : “bar”] var combinedDict = … (some way of combining dict1 & dict2 without looping) 28 Answers … Read more
What I mean is – we know that the std::map‘s elements are sorted according to the keys. So, let’s say the keys are integers. If I iterate from std::map::begin() to std::map::end() using a for, does the standard guarantee that I’ll iterate consequently through the elements with keys, sorted in ascending order? Example: std::map<int, int> map_; … Read more
I have a very simple task I am trying to do in Groovy but cannot seem to get it to work. I am just trying to loop through a map object in groovy and print out the key and value but this code does not work. // A simple map def map = [ iPhone … Read more
I’d like to map a function on all keys in the dictionary. I was hoping something like the following would work, but filter cannot be applied to dictionary directly. What’s the cleanest way of achieving this? In this example, I’m trying to increment each value by 1. However this is incidental for the example – … Read more
I am practicing using type hints in Python 3.5. One of my colleague uses typing.Dict: import typing def change_bandwidths(new_bandwidths: typing.Dict, user_id: int, user_name: str) -> bool: print(new_bandwidths, user_id, user_name) return False def my_change_bandwidths(new_bandwidths: dict, user_id: int, user_name: str) ->bool: print(new_bandwidths, user_id, user_name) return True def main(): my_id, my_name = 23, “Tiras” simple_dict = {“Hello”: “Moon”} … Read more
I need to merge multiple dictionaries, here’s what I have for instance: dict1 = {1:{“a”:{A}}, 2:{“b”:{B}}} dict2 = {2:{“c”:{C}}, 3:{“d”:{D}} With A B C and D being leaves of the tree, like {“info1″:”value”, “info2″:”value2”} There is an unknown level(depth) of dictionaries, it could be {2:{“c”:{“z”:{“y”:{C}}}}} In my case it represents a directory/files structure with nodes … Read more
This question already has answers here: How do I merge two dictionaries in a single expression (take union of dictionaries)? (48 answers) Closed 9 years ago. How do you calculate the union of two dict objects in Python, where a (key, value) pair is present in the result iff key is in either dict (unless … Read more
I have a named tuple class in python class Town(collections.namedtuple(‘Town’, [ ‘name’, ‘population’, ‘coordinates’, ‘population’, ‘capital’, ‘state_bird’])): # … I’d like to convert Town instances into dictionaries. I don’t want it to be rigidly tied to the names or number of the fields in a Town. Is there a way to write it such that … Read more
Thanks to some great folks on SO, I discovered the possibilities offered by collections.defaultdict, notably in readability and speed. I have put them to use with success. Now I would like to implement three levels of dictionaries, the two top ones being defaultdict and the lowest one being int. I don’t find the appropriate way … Read more
This is the dictionary cars = {‘A’:{‘speed’:70, ‘color’:2}, ‘B’:{‘speed’:60, ‘color’:3}} Using this for loop for keys,values in cars.items(): print(keys) print(values) It prints the following: B {‘color’: 3, ‘speed’: 60} A {‘color’: 2, ‘speed’: 70} But I want the program to print it like this: B color : 3 speed : 60 A color : 2 … Read more