Reference library

Python Code Samples

Easy snippets you can copy, study, and run in the browser editor.

4 matches
Errors & debugging easy

How to Record Last N Errors with a Ring Buffer in Python

Use collections.deque with maxlen to keep only the most recent N error messages while discarding older entries automatically.

ring-buffer deque error-handling
Python 
import collections

class ErrorRecorder:
    def __init__(self, size):
        self.buffer = collections.deque(maxlen=size)

    def record_error(self, message):
        self.buffer.append(message)

    def get_errors(self):
        return list(self.buffer)

if __name__ == "__main__":
    recorder = ErrorRecorder(3)
 …
13 0 Open
Files & data easy

How to Write Bytes to a File in Python with 'wb'

Write a bytearray buffer to a binary file using Python's open() in 'wb' mode, then read it back to confirm the data.

bytes file-writing binary-files
Python 
data = bytearray([0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x20, 0x57, 0x6f, 0x72, 0x6c, 0x64])

with open("output.bin", "wb") as f:
    f.write(data)

with open("output.bin", "rb") as f:
    content = f.read()

print(f"Written {len(data)} bytes: {content}")
print(f"As string: {content.decode('ascii')}")
13 0 Open
AI & LLM integration patterns easy

How to Keep Last K Turns in a Memory Buffer in Python

A TurnBuffer class using deque with maxlen to keep only the most recent k conversation turns in memory for LLM context.

deque llm-context memory-buffer
Python 
from collections import deque

class TurnBuffer:
    def __init__(self, k):
        self.k = k
        self.turns = deque(maxlen=k)

    def add(self, turn):
        self.turns.append(turn)

    def last_k(self):
        return list(self.turns)


if __name__ == "__main__":
    buffer = TurnBuffer(3)
    buffer.add("tu…
14 0 Open
Big data & Spark easy

How to Mock a Socket Stream in Python

Simulate a streaming socket source with a generator to test stream-read and buffering logic without a real network.

socket mock streaming
Python 
import socket
import threading
import time

def mock_socket_stream(data_chunks, delay=0.1):
    """Generator that simulates a streaming socket source."""
    for chunk in data_chunks:
        time.sleep(delay)
        yield chunk

def read_stream_socket(stream_gen):
    """Reads from mock stream and prints received ch…
14 0 Open

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PythonSkillset code samples are short, focused examples organised by topic and difficulty. Every snippet is server-rendered HTML — readable by search engines and easy to copy. Open any sample, read the notes, copy the code, then press Try in editor to run it in the browser with Pyodide.

How to use this library

  1. Pick a topic section — strings, lists, files, functions, and more
  2. Open a sample, read How it works, and copy the code block
  3. Run it in the IDE, tweak values, then take a related quiz or tutorial lesson

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.

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