Dumping queue into list or array in Python

Last Updated : 31 Dec, 2020

Prerequisite: Queue in Python

Here given a queue and our task is to dump the queue into list or array. We are to see two methods to achieve the objective of our solution.

Example 1:

In this example, we will create a queue using the collection package and then cast it into the list

Python3

# Python program to 
# demonstrate queue implementation 
# using collections.dequeue 
   
from collections import deque 
   
# Initializing a queue 
q = deque() 
   
# Adding elements to a queue 
q.append('a') 
q.append('b') 
q.append('c') 
  
# display the queue 
print("Initial queue") 
print(q,"\n") 
  
# display the type 
print(type(q)) 

Output:

Initial queue
deque(['a', 'b', 'c']) 

<class 'collections.deque'>

Let’s create a list and cast into it:

Python3

# convert into list 
li = list(q) 
  
# display 
print("Convert into the list") 
print(li) 
print(type(li)) 

Output:

Convert into the list
['a', 'b', 'c']
<class 'list'>

Example 2:

In this example, we will create a queue using the queue module and then cast it into the list.

Python3

from queue import Queue 
  
# Initializing a queue 
que = Queue() 
  
# Adding elements to a queue 
que.put(1) 
que.put(2) 
que.put(3) 
que.put(4) 
que.put(5) 
  
# display the queue 
print("Initial queue") 
print(que.queue) 
  
# casting into the list 
li = list(que.queue) 
print("\nConverted into the list") 
print(li)

Output:

Initial queue
deque([1, 2, 3, 4, 5])

Converted into the list
[1, 2, 3, 4, 5]

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