shelve.py: database of persistent objects, on top of pickle.py and anydbm.py

pickle.py: new low-level persistency module (used to be called flatten)
dbmac.py: stupid dbm clone for the Mac
anydbm.py: generic dbm interface (should be extended to support gdbm)

1 files changed, 43 insertions, 0 deletions

diff --git a/Lib/shelve.py b/Lib/shelve.py
new file mode 100644
index 0000000..b90e641
--- /dev/null
+++ b/Lib/shelve.py
@@ -0,0 +1,43 @@
+"""Manage shelves of pickled objects."""
+
+import pickle
+import StringIO
+
+class Shelf:
+
+	def __init__(self, dict):
+		self.dict = dict
+	
+	def keys(self):
+		return self.dict.keys()
+	
+	def __len__(self):
+		return self.dict.len()
+	
+	def has_key(self, key):
+		return self.dict.has_key(key)
+	
+	def __getitem__(self, key):
+		return pickle.Unpickler(StringIO.StringIO(self.dict[key])).load()
+	
+	def __setitem__(self, key, value):
+		f = StringIO.StringIO()
+		p = pickle.Pickler(f)
+		p.dump(value)
+		self.dict[key] = f.getvalue()
+	
+	def __delitem__(self, key):
+		del self.dict[key]
+	
+	def close(self):
+		self.db.close()
+		self.db = None
+
+class DbShelf(Shelf):
+	
+	def __init__(self, file):
+		import anydbm
+		Shelf.__init__(self, anydbm.open(file))
+
+def open(file):
+	return DbShelf(file)