Cloud + Python
Cloud SDK patterns — storage, serverless handlers, secrets, and deployment helpers.
How to Calculate Cloud Cost Estimates with a Python Dictionary
Mocks a cloud pricing calculator using a dictionary of service rates and computes total estimated cost for given service hours.
def estimate_cost(service, hours, rate_table=None):
if rate_table is None:
rate_table = {
"basic": 50,
"standard": 75,
"premium": 100
}
if service not in rate_table:
raise ValueError(f"Unknown service: {service}")
return rate_table[service] * hour…How to Calculate VPC Subnet CIDR Details in Python
Compute network address, broadcast address, address count, prefix length, and netmask for any IPv4 CIDR using the Python standard library's ipaddress module.
import ipaddress
def subnet_details(cidr: str) -> dict:
network = ipaddress.ip_network(cidr, strict=False)
return {
"network_address": str(network.network_address),
"broadcast_address": str(network.broadcast_address),
"num_addresses": network.num_addresses,
"prefix_length": ne…How to Mock DynamoDB with a Simple Dict Store in Python
A lightweight in-memory DynamoDB mock that stores items in a dict and supports put, get, and query-by-value operations for local testing.
import json
from typing import Any, Dict, Optional
class MockDynamoDB:
def __init__(self) -> None:
self._store: Dict[str, Dict[str, Any]] = {}
def put_item(self, table_name: str, item: Dict[str, Any]) -> None:
key = str(item.get("id"))
if table_name not in self._store:
se…How to Mock Pulumi Stack Outputs in Python
Create a dict-like mock of Pulumi stack outputs for local testing and scripts without running pulumi.
from collections import defaultdict
class StackOutputMock:
def __init__(self, outputs: dict):
self.outputs = dict(outputs)
def export(self):
return self.outputs
def get(self, key: str, default=None):
return self.outputs.get(key, default)
def keys(self):
r…How to Parse Terraform Output JSON in Python
Parse Terraform's JSON output into a flat dictionary of values using the standard library json module.
import json
def parse_terraform_output(raw_output):
"""Parse Terraform JSON output into a flat dict of values."""
try:
data = json.loads(raw_output)
except json.JSONDecodeError as e:
raise ValueError(f"Invalid JSON: {e}")
return {key: value["value"] for key, value in data.items()}
i…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=…How to plan reserved capacity from a CSV in Python
Read a CSV of workloads with csv.DictReader and compute a mock reserved capacity plan with headroom per service.
import csv
import io
def plan_reserved_capacity(workloads_csv: str) -> list[dict]:
"""Read a CSV of workloads and return a plan for reserved capacity per service."""
reader = csv.DictReader(io.StringIO(workloads_csv))
plan = []
for row in reader:
service = row["service"]
avg_load = fl…Mock CDK Synth Output in Python for Template Testing
Simulate AWS CDK synth output with MagicMock to test or preview CloudFormation templates without running a real CDK app.
import json
from unittest.mock import MagicMock
def mock_cdk_synth() -> dict:
"""Simulate AWS CDK synth output for a simple S3 bucket."""
cdk_app = MagicMock()
cdk_app.synth.return_value.template = {
"Resources": {
"MyBucket": {
"Type": "AWS::S3::Bucket",
…Mock CloudWatch put_metric_data in Python
Simulate AWS CloudWatch put_metric_data with validation and formatted output for local testing without AWS.
import json
from datetime import datetime, timezone
def put_metric_data(namespace, metric_data_list):
"""
Mock AWS CloudWatch put_metric_data.
Validates and prints the metrics that would be sent.
"""
timestamp = datetime.now(timezone.utc).isoformat()
print(f"[MockCloudWatch] Received request …Browse by section
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