From e8998a40982b84a4b392066e173b0e23439cbb90 Mon Sep 17 00:00:00 2001
From: gahusb <bgg8988@gmail.com>
Date: Thu, 9 Jul 2026 13:20:59 +0900
Subject: [PATCH] =?UTF-8?q?feat(realestate):=20=EB=A7=A4=EB=AC=BC=20?=
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---
 realestate-lab/app/lawd_codes.py        | 24 ++++++++++++++++++++++++
 realestate-lab/tests/test_lawd_codes.py |  6 ++++++
 2 files changed, 30 insertions(+)
 create mode 100644 realestate-lab/app/lawd_codes.py
 create mode 100644 realestate-lab/tests/test_lawd_codes.py

diff --git a/realestate-lab/app/lawd_codes.py b/realestate-lab/app/lawd_codes.py
new file mode 100644
index 0000000..532bda1
--- /dev/null
+++ b/realestate-lab/app/lawd_codes.py
@@ -0,0 +1,24 @@
+"""대상 동명 → 법정동코드(시군구 5자리, LAWD_CD). 국토부 실거래가 API 파라미터용.
+동작구/관악구/영등포구 중심(스펙 초기 대상 동). 신규 동 추가 시 여기에.
+출처: 행정표준코드관리시스템 시군구 코드."""
+
+# 시군구(구) 단위 5자리 — 실거래가 API는 LAWD_CD=시군구코드를 받는다.
+_DISTRICT_CODE = {
+    "동작구": "11590",
+    "관악구": "11620",
+    "영등포구": "11560",
+    "서초구": "11650",
+    "강남구": "11680",
+}
+# 동 → 소속 구
+_DONG_TO_DISTRICT = {
+    "신대방동": "동작구", "대방동": "동작구", "상도동": "동작구", "노량진동": "동작구", "사당동": "동작구",
+    "봉천동": "관악구", "신림동": "관악구",
+    "신길동": "영등포구", "대림동": "영등포구", "영등포동": "영등포구",
+}
+
+LAWD_CODES = {dong: _DISTRICT_CODE[d] for dong, d in _DONG_TO_DISTRICT.items() if d in _DISTRICT_CODE}
+
+
+def lawd_code(dong: str) -> str | None:
+    return LAWD_CODES.get((dong or "").strip())
diff --git a/realestate-lab/tests/test_lawd_codes.py b/realestate-lab/tests/test_lawd_codes.py
new file mode 100644
index 0000000..5211cc6
--- /dev/null
+++ b/realestate-lab/tests/test_lawd_codes.py
@@ -0,0 +1,6 @@
+def test_lawd_code_maps_target_dongs():
+    from app.lawd_codes import lawd_code
+    assert lawd_code("신대방동") == "11590"   # 동작구
+    assert lawd_code("봉천동") == "11620"      # 관악구
+    assert lawd_code("신길동") == "11560"      # 영등포구
+    assert lawd_code("없는동") is None