Answer architecture round 3: fence's docstring says a locality needs entries in both child maps, and zcta_localities says what it maps to

data-import/geo-se.py

@@ -186,9 +186,9 @@ def main():
     regions = {c: {"code": c, "name": n, "population": population[c], "timezone": TIMEZONE} for c, n in region_names.items()}
     municipalities = {c: {"code": c, "name": n, "region": c[:2], "population": population[c]} for c, n in municipality_names.items()}
     kept, dropped = geo.fence(regions, municipalities, places, named, {k: l["codes"] for k, l in places.items()})
-    geo.log_dropped(dropped["locality"], "no street or postal code")
-    if dropped["municipality"]:
-        sys.exit(f"municipalities without a locality: {sorted(dropped['municipality'])}")
+    geo.log_dropped_localities(dropped["locality"])
+    if dropped["municipality"] or dropped["region"]:
+        sys.exit(f"left without a child: municipalities {sorted(dropped['municipality'])}, regions {sorted(dropped['region'])}")
     places = kept["locality"]
 
     tsv.write(out / "region.tsv", ["code", "name", "population", "timezone"], [r for _, r in sorted(kept["region"].items())])