Update sqlite3-python/README.md

sqlite3-python/README.md

@@ -10,17 +10,17 @@ sql('SELECT * FROM sqlite_master WHERE type="table"')
 
 # Simple
 ```python
-def SQL():
-    sql = __import__('sqlite3').connect('sql.db', isolation_level=None, timeout=1e999).execute
-    sql('PRAGMA journal_mode = WAL')
-    sql('CREATE TABLE IF NOT EXISTS dict (key PRIMARY KEY, value)')
+def Dict(db='dict.db', *, sqlite3=__import__('sqlite3')):
+    sql = sqlite3.connect(db, isolation_level=None, timeout=1e999).execute
+    sql('PRAGMA journal_mode=WAL'); sql('CREATE TABLE IF NOT EXISTS d(k PRIMARY KEY, v)')
     return type('', (), dict(__call__=lambda _, *args: list(sql(*args)),
-    __setitem__=lambda _, *kv:sql('INSERT OR REPLACE INTO dict VALUES(?,?)',kv),
-    __getitem__=lambda sql,*k:sql('SELECT * FROM dict WHERE key=?', k)[0][1]))()
-#
-sql = SQL()
+    __setitem__=lambda sql, *kv: sql('INSERT OR REPLACE INTO d VALUES (?,?)', kv),
+    __getitem__=lambda sql, *k: sql('SELECT v FROM d WHERE k = ?', k)[0][0],
+    __iter__=lambda sql: (k[0] for k in sql('SELECT k FROM d'))))()
+sql = Dict()
 sql[4] = 2
 print(sql[4]) # 2
+print(list(sql)) # [4]
 ```
 
 # Class