Saylor Innovations Token Prices

Python f-string formatting - 2.675 formats as 2.67, round-half-even in .0f, thousands and percent specs, = debug, 3.10 quote and backslash limits

Run commands safely in Python - list args vs shell=True injection, check, timeouts, pipe exit codes, output

Python concurrency - ThreadPoolExecutor vs ProcessPoolExecutor measured: CPU work slower with threads, I/O faster, lost exceptions

Python numeric gotchas run live - round half even, floor division with negatives, truthiness traps, is vs ==, Decimal rounding

Debug poor RAG answers - check the index, retrieval hit rate, hybrid search, reranking, chunk size and context packing

Fix React useEffect infinite loops and stale closures - dependency arrays, unstable objects, functional updates, cleanup and Strict Mode double runs

Fix Redis connection refused, auth errors, max clients and timeouts - bind and protected mode, slowlog, big keys, fork stalls and client settings

Fix Redis OOM errors and unexpected eviction - maxmemory, eviction policy, big keys and missing TTLs

Fix catastrophic regex backtracking and ReDoS - nested quantifier patterns, rewrites with atomic groups, input limits and linear-time engines like RE2

Check robots.txt in Python - stdlib first-match rule order, no wildcard support, crawl_delay, site_maps, empty file and 5xx handling

Rsync recipes - trailing slash decides nesting, --delete only with dry run -n first, itemize-changes codes, excludes, link-dest snapshots

Text processing from the shell - awk column sums and filters, dedupe with seen[$0]++, sed substitution and -i.bak edits, CSV traps

Fix 502, 504 and timeouts in Netlify and Vercel functions - read function logs, plan limits, background functions, bundling and response shape and size