Cloud + Python
Cloud SDK patterns — storage, serverless handlers, secrets, and deployment helpers.
How to mock boto3 S3 upload file wrapper in Python
Wrap an S3 put_object call in a testable function that returns metadata, and mock boto3 to verify the upload without touching AWS.
import boto3
import io
def upload_file_to_s3(file_obj, bucket, key, object_metadata=None):
"""Upload a file-like object to S3 and return a metadata dict."""
s3 = boto3.client("s3")
content = file_obj.read()
s3.put_object(
Bucket=bucket,
Key=key,
Body=content,
Metadata=…Mock S3 List Objects Paginator in Python
This code implements a mock S3 paginator that yields pages of object keys, mimicking the behavior of boto3's list_objects_v2 paginator for local testing.
import json
from datetime import datetime, timezone
class MockS3Paginator:
"""A mock S3 list_objects_v2 paginator returning pages of keys."""
def __init__(self, bucket, all_keys, page_size=1000):
self.bucket = bucket
self.all_keys = all_keys
self.page_size = page_size
def pagina…Browse by section
Each section groups closely related Python snippets.
Cloud + Python — Python code examples
What you will find here
This page collects cloud + python 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.