I was in class last week. One of my students raised their hand mid-lecture and asked something that stopped me for a second. "Why is every AI tool built on Python? C++ is faster. Rust is faster. Even Java is faster. So why Python?" Honestly it’s a fair question. And the answer reveals something really interesting about how the AI industry actually works. Let me explain this properly. 🧵

Amazing one Eureka!

Good morning New day, fresh commit. Yesterday’s bugs don’t define today’s build. Learn fast. Keep going. Let us not be weary in well doing: for in due season we shall reap, if we faint not.

SQL interview challenge: Tables: customers (customer_id, name) transactions (transaction_id, customer_id, amount, txn_date) Find every customer who has made no transactions in the last 30 days. The catch: customers who have never made a transaction at all must also appear in your result. Note: solve it without using NOT IN. Drop your answer below

Trace vs span: two words you need if you build or monitor AI agents When something goes wrong in a system, the first question is: where exactly did it break? Traces and spans answer that. Span One single step of work. It has a name, a start time, an end time and details about what happened. "Check account balance" is a span. "Call the fraud model" is a span. "Send SMS" is a span. Trace The full journey of one request, made up of all its spans, linked together in order. "Customer sends ₦50,000" is one trace. Inside it: verify PIN, check balance, run fraud check, debit account, send SMS. Each one is a span. The easy way to remember it: A trace is the whole trip. A span is one stop on the way. Why it matters for AI agents: One question to an agent can trigger several model calls, three tool calls and a database search. If the answer comes back slow or wrong, the trace shows you every step, and the spans tell you which one took 8 seconds or returned rubbish. Without traces, you're guessing. With them, you can point to the exact step. Tools like OpenTelemetry, LangSmith and Langfuse record traces for you, so you don't have to build this yourself.