How to Use Python Queue Module
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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