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python3 queue.PriorityQueue changes?


python3 queue.PriorityQueue changes?

By : Pranay
Date : November 21 2020, 12:01 PM
To fix this issue Nothing has changed related to PriorityQueues; what's changed is related to dict, and more generally to sorting objects that have no natural ordering.
The problem is that you're trying to sort two tuples that contain dicts, like this:
code :
(3, 'SOME_TAG', {'some': 'type', 'of': 'data'})
(3, 'SOME_TAG', {'some': 'type', 'of': 'data'})
(3, 'SOME_TAG', {'some': 'othertype', 'with': 'differentdata'})
class TupleSortingOn0(tuple):
    def __lt__(self, rhs):
        return self[0] < rhs[0]
    def __gt__(self, rhs):
        return self[0] > rhs[0]
    def __le__(self, rhs):
        return self[0] <= rhs[0]
    def __ge__(self, rhs):
        return self[0] >= rhs[0]
TX_Queue.put(TupleSortingOn0(3,'SOME_TAG',{some:type,of:data}))


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Is PriorityQueue a FIFO Queue?

Is PriorityQueue a FIFO Queue?


By : Max Svenman
Date : March 29 2020, 07:55 AM
should help you out From the Queue interface:
Java PriorityQueue implementation: Why Object[] queue instead of E[] queue? What's the purpose of "key" in sif

Java PriorityQueue implementation: Why Object[] queue instead of E[] queue? What's the purpose of "key" in sif


By : saiinox
Date : March 29 2020, 07:55 AM
I wish this help you 1) You cannot instantiate an array of a generic type without having a reference to the Class of the object. See JavaDevil's comment below for an example. However, by creating an array of Object's instead, there's is no requirement to feed an instance of the Class to the PriorityQueue.
code :
E[] array = new E[10]; // won't compile
private void siftDown(int k, E x) {
    if (comparator != null)
        siftDownUsingComparator(k, x);
    else
        siftDownComparable(k, x);
}
python3 priorityqueue size by priority?

python3 priorityqueue size by priority?


By : Ivan Lee
Date : March 29 2020, 07:55 AM
I wish this help you is there a way to take the .size() of the priority queue ... for each priority level? , The simplest way I can see to do this would be
code :
from collections import Counter
sizeByPriority = Counter(priority for priority, _elem in q.queue)
Is there a Queue (PriorityQueue) implementation which is also a Set?

Is there a Queue (PriorityQueue) implementation which is also a Set?


By : user3825865
Date : March 29 2020, 07:55 AM
should help you out If it's sufficient to have a queue with a 'Set-like' behaviour, iaw you just don't want to accept duplicate entries, then I think, an easy solution could be to subclass PriorityQueue and override the add(), addAll() and offer() methods like:
Why would a PriorityQueue not act like a Queue?

Why would a PriorityQueue not act like a Queue?


By : mayuresh Patil
Date : March 29 2020, 07:55 AM
I think the issue was by ths following ,
Operations on this class make no guarantees about the ordering of elements with equal priority. If you need to enforce an ordering, you can define custom classes or comparators that use a secondary key to break ties in primary priority values.
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