Can I get an item from a PriorityQueue without removing it yet?

Question

I want to get the next item in queue but I don't want to dequeue it. Is it possible in Python's queue.PriorityQueue? From the docs, I don't see how can it be done

Answer 1

If a is a PriorityQueue object, You can use a.queue[0] to get the next item:

from queue import PriorityQueue  a = PriorityQueue()  a.put((10, "a")) a.put((4, "b")) a.put((3,"c"))  print(a.queue[0]) print(a.queue) print(a.get()) print(a.queue) print(a.get()) print(a.queue) 

output is :

(3, 'c') [(3, 'c'), (10, 'a'), (4, 'b')] (3, 'c') [(4, 'b'), (10, 'a')] (4, 'b') [(10, 'a')] 

but be careful about multi thread access.

Answer 2

If you want next element in the PriorityQueue, in the order of the insertion of the elements, use:

for i in range(len(queue.queue)):     print queue.queue[i] 

this will not pop anything out.

If you want it in the priority order, use:

for i in range(len(queue.queue)):     temp = queue.get()     queue.put(temp)     print temp 

If you are using a tuple, instead of a single variable, replace temp by:

((temp1,temp2))