Try list(newdict.keys()). This will convert the dict_keys object to a list. On the other hand, you should ask yourself whether or not it matters. The Pythonic way to code is to assume duck typing (if it looks like a duck and it quacks like a duck, it’s a duck). The dict_keys object will act like a list for most purposes. … Read more
But I think you can omit map and use simple subtract and then convert to list: Also don’t use variable list (reserved word in python) rather L (or something else): Sample: EDIT: I try simulate problem: If change list to L, is important reopen python console, because still same error. So this works perfectly:
What’s likely happening is that SignalData is indirectly changing the subscribers dictionary under the hood during the loop and leading to that message. You can verify this by changing To If I’m right, the problem will disappear. Calling subscribers.Values.ToList() copies the values of subscribers.Values to a separate list at the start of the foreach. Nothing else has access to this list (it … Read more
I believe the syntax you were looking for is as follows: Alternately, for python <= 2.7.1, you want:
Since the question is specific to Python 3, here’s using the new f-string syntax, available since Python 3.6: Note the outer single quotes and inner double quotes (you could also do it the other way around).
There is no difference between the objects; you have a HashMap<String, Object> in both cases. There is a difference in the interface you have to the object. In the first case, the interface is HashMap<String, Object>, whereas in the second it’s Map<String, Object>. But the underlying object is the same. The advantage to using Map<String, Object> is that you can change the underlying … Read more
time1 is the key of the most outer dictionary, eg, feb2012. So then you’re trying to index the string, but you can only do this with integers. I think what you wanted was: As you’re going through each dictionary, you must add another nest.
Bash 4 Bash 4 natively supports this feature. Make sure your script’s hashbang is #!/usr/bin/env bash or #!/bin/bash so you don’t end up using sh. Make sure you’re either executing your script directly, or execute script with bash script. (Not actually executing a Bash script with Bash does happen, and will be really confusing!) You declare an associative array by doing: You can fill it up with … Read more
Section 6.6 of The C Programming Language presents a simple dictionary (hashtable) data structure. I don’t think a useful dictionary implementation could get any simpler than this. For your convenience, I reproduce the code here. Note that if the hashes of two strings collide, it may lead to an O(n) lookup time. You can reduce the likelihood of collisions … Read more
It’s as simple as this: Note that if the dictionary doesn’t have a key that equals “XML_File”, that code will throw an exception. If you want to check first, you can use TryGetValue like this: