Update sqlite3-python/README.md

sqlite3-python/README.md

@@ -24,29 +24,22 @@ print(list(sql)) # [4]
 
 # Cache
 ```python
-class Cache:
+class Fetch:
-    def __init__(self):
+    def __init__(self, db='fetch.db'):
-        import sqlite3
+        self.con = __import__('sqlite3').connect(db, isolation_level=None)
-        con = sqlite3.connect('fetch.db', isolation_level=None, timeout=1e999)
-        con.row_factory = sqlite3.Row
-        self.execute = con.execute
         self('PRAGMA busy_timeout='f'{1e9}')
         self('PRAGMA journal_mode=WAL')
         self('PRAGMA wal_checkpoint(FULL)')
-        self('CREATE TABLE IF NOT EXISTS cache(url TEXT PRIMARY KEY, blob BLOB)')
+        self('CREATE TABLE IF NOT EXISTS cache(url PRIMARY KEY, blob)')
-    def __call__(self, q, *p): return list(map(dict, self.execute(q, p)))
+    def __call__(self, *args): return list(self.con.execute(*args))
-    def __setitem__(self, url, blob): self('INSERT OR REPLACE INTO cache VALUES(?,?)', url, blob)
+    def __getitem__(self, url):
-    def __getitem__(self, url): 
+        if blob := self('SELECT blob FROM cache WHERE url=?', (url,)):
-        if blob := self('SELECT blob FROM cache WHERE url=?', url): return blob[0]['blob']
+            return blob[0][0]
-    def __delitem__(self, url): self('DELETE FROM cache WHERE url=?', url)
+        else:
-    def __iter__(self): return iter(url['url'] for url in self('SELECT url FROM cache'))
+            blob = __import__('urllib').request.urlopen(url).read()
-    def fetch(self, url):
+            self('INSERT INTO cache VALUES(?,?)', (url, blob))
-        import urllib.request
+            return blob
-        if not (blob := self[url]): self[url] = urllib.request.urlopen(url).read()
+fetch = Fetch()
-        return self[url]
-cache = Cache()
-cache.fetch('https://example.com')
-print(list(cache))
 ```
 
 # Class