Initial revision

Demo/classes/Dbm.py

@@ -0,0 +1,71 @@
+# A wrapper around the (optional) built-in class dbm, supporting keys
+# and values of almost any type instead of just string.
+# (Actually, this works only for keys and values that can be read back
+# correctly after being converted to a string.)
+
+
+def opendbm(filename, mode, perm):
+	return Dbm().init(filename, mode, perm)
+
+
+class Dbm:
+
+	def init(self, filename, mode, perm):
+		import dbm
+		self.db = dbm.open(filename, mode, perm)
+		return self
+
+	def __repr__(self):
+		s = ''
+		for key in self.keys():
+			t = `key` + ': ' + `self[key]`
+			if s: t = t + ', '
+			s = s + t
+		return '{' + s + '}'
+
+	def __len__(self):
+		return len(self.db)
+
+	def __getitem__(self, key):
+		return eval(self.db[`key`])
+
+	def __setitem__(self, key, value):
+		self.db[`key`] = `value`
+
+	def __delitem__(self, key):
+		del self.db[`key`]
+
+	def keys(self):
+		res = []
+		for key in self.db.keys():
+			res.append(eval(key))
+		return res
+
+	def has_key(self, key):
+		return self.db.has_key(`key`)
+
+
+def test():
+	d = opendbm('@dbm', 'rw', 0666)
+	print d
+	while 1:
+		try:
+			key = eval(raw_input('key: '))
+			if d.has_key(key):
+				value = d[key]
+				print 'currently:', value
+			value = eval(raw_input('value: '))
+			if value == None:
+				del d[key]
+			else:
+				d[key] = value
+		except KeyboardInterrupt:
+			print ''
+			print d
+		except EOFError:
+			print '[eof]'
+			break
+	print d
+
+
+test()