Python Code
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Copy-ready Python snippets by topic and difficulty — short, focused, and runnable in the browser editor.
How to Use as_completed to Process Futures in Order of Completion
Submit multiple tasks to a ThreadPoolExecutor and process each result as soon as it finishes using as_completed.
from concurrent.futures import ThreadPoolExecutor, as_completed
import time
def fetch_data(item_id):
time.sleep(1)
return f"item-{item_id}"
def main():
with ThreadPoolExecutor(max_workers=3) as executor:
future_map = {executor.submit(fetch_data, i): i for i in range(1, 6)}
for future in…How to Wait for the First Future to Complete in Python
Use concurrent.futures.wait with FIRST_COMPLETED to pause until any task finishes and inspect the remaining pending futures.
import concurrent.futures
import time
def task(name, delay):
time.sleep(delay)
return f"{name} done"
if __name__ == "__main__":
with concurrent.futures.ThreadPoolExecutor(max_workers=3) as executor:
futures = [
executor.submit(task, "task1", 2),
executor.submit(task, "ta…Browse by section
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Guide: free Python code samples library
Copy-ready Python snippets for learners and developers
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
- Pick a topic section — strings, lists, files, functions, and more
- Open a sample, read How it works, and copy the code block
- 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.