Streaming & messaging
Kafka-style pub/sub, event consumers, async pipelines, and message-driven workflows.
How to Build a Flow Control Credit Window in Python
A Python class that reserves, confirms, releases, and settles credit to limit message flow and prevent overload in streaming pipelines.
class CreditWindow:
def __init__(self, max_credit=1000):
self.max_credit = max_credit
self.used_credit = 0
self.pending_credit = 0
def try_reserve(self, amount):
available = self.max_credit - self.used_credit - self.pending_credit
if available >= amount:
…How to Implement Backpressure Pause Producer with a Bounded Queue in Python
Places a Producer thread that sends items into a bounded queue with backpressure: on Full, it pauses to let the consumer catch up.
import threading
import time
import queue
import random
class Producer:
def __init__(self, q):
self.q = q
self.running = True
def produce(self):
while self.running:
item = random.randint(1, 100)
try:
self.q.put(item, timeout=0.5)
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Streaming & messaging — Python code examples
What you will find here
This page collects streaming & messaging snippets — short, copy-ready Python you can paste into our free online IDE and run without installing anything. Each sample includes a plain-English explanation and the full source code.
Samples vs tutorials and challenges
Samples are quick reference — one concept per page. For step-by-step teaching, use our Python tutorials. To test yourself, try quizzes or coding challenges. Clean up style with the Python formatter.