How to Use Python Queue Module

Contents
In this article, you will learn how to use Python queue module.
Python Queue Module
The queue module in Python provides several classes for implementing multi-threaded queues that can be used to coordinate the exchange of information between threads. Here are a few examples of how you can use the queue module in Python:
Queue class
This is a simple implementation of a thread-safe queue that can be used to pass messages from one thread to another. Here’s an example:
import queue
import threading
# Create a queue object
q = queue.Queue()
# Define a worker function that takes items from the queue and processes them
def worker():
while True:
item = q.get()
if item is None:
break
# Process the item
print("Processing item:", item)
q.task_done()
# Start the worker thread
t = threading.Thread(target=worker)
t.start()
# Put items in the queue for the worker to process
for item in range(10):
q.put(item)
# Wait for all items in the queue to be processed
q.join()
# Stop the worker thread
q.put(None)
t.join()
LifoQueue class
This is a variation of the Queue class that implements a Last-In, First-Out (LIFO) queue. Here’s an example:
import queue
# Create a LIFO queue object
q = queue.LifoQueue()
# Put items in the queue
for item in range(10):
q.put(item)
# Get items from the queue (in reverse order)
while not q.empty():
item = q.get()
print("Processing item:", item)
PriorityQueue class
This is a variation of the Queue class that implements a priority queue, where items are processed in order of priority. Here’s an example:
import queue
# Create a priority queue object
q = queue.PriorityQueue()
# Put items in the queue with different priorities
q.put((1, "low priority item"))
q.put((10, "high priority item"))
# Get items from the queue (in order of priority)
while not q.empty():
item = q.get()
print("Processing item:", item[1])
These are just a few examples of how you can use the queue module in Python. For more information, you can refer to the Python documentation: https://docs.python.org/3/library/queue.html