🎥 The full walkthrough video is embedded below.
Today I shipped Mod 1 of a one-file program called investor_tool.py. In plain English, it:
Reads two spreadsheets (actives + rentals) in the same folder
Cleans messy fields (encodings, zips, subdivision/city names)
Estimates rent using a most-specific-first approach (subdivision → zip → union) with a built-in safety cap
Asks for loan inputs, calculates monthly P&I and profit, then
Saves clean results and prints a top-10 preview with clear rent-source labels
Why Pseudocode (and how I use it as a “mega-prompt”)
Before any coding, I write pseudocode—a narrative outline that describes what should happen, not how. It’s the bridge between concept and code, and doubles as my mega-prompt when working with AI tools.
Example outline for this project:
Load both files and normalize text/zips
Build subdivision base and root keys
Estimate rent by tiers; stop at the first tier that succeeds
Apply a $/sqft safety cap
Collect user loan inputs, compute P&I + profit
Save results + simple audit columns
That roadmap keeps logic clear, scope tight, and AI assistance focused.
What Mod 1 delivers
Vectorized, fast cleaning even with large CSVs
Clear tier labels (T1–T4 and Fallback) so you know why each rent was chosen
Friendly console flow with short, practical messages
Output sorted by profit, formatted in plain-English dollars
Spot-check insight → Mod 2 plan
While recording the walkthrough, I found a 3/2 at 1,300 sqft estimated at $2,800 rent — the median of 12 comps, but most were much larger.
👉 That’s our signal that room count alone isn’t enough.
Mod 2 will add size-awareness:
Use SQFT windows (±15% or ±300 sqft) when comparing comps
Normalize rents by $/sqft before computing medians
Keep the “stop on first success” logic, but only if the comp size makes sense
The goal: push accuracy to the next level.
Bonus in the final module
After Mod 2, I’ll reveal a bonus step — how this single Python file could become a simple, shareable app with optional monetization potential. No heavy setup, no servers. Just one small extra layer.
The final Mod will be out early this week.
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