Two new generally useful modules: types defines names for all built-in types,

StringIO implements pseudo files writing into and reading from strings.

Lib/types.py

@@ -0,0 +1,43 @@
+# Define names for all type symbols known in the standard interpreter.
+# Types that are part of optional modules (e.g. array) are not listed.
+
+import sys
+
+NoneType = type(None)
+TypeType = type(NoneType)
+
+IntType = type(0)
+LongType = type(0L)
+FloatType = type(0.0)
+
+StringType = type('')
+
+TupleType = type(())
+ListType = type([])
+DictionaryType = type({})
+
+def func(): pass
+FunctionType = type(func)
+
+class C:
+	def meth(self): pass
+ClassType = type(C)
+UnboundMethodType = type(C.meth)	# Same as MethodType
+x = C()
+InstanceType = type(x)
+MethodType = type(x.meth)
+
+BuiltinFunctionType = type(len)		# Also used for built-in methods
+
+ModuleType = type(sys)
+
+FileType = type(sys.stdin)
+XRangeType = type(xrange(0))
+
+try:
+	raise TypeError
+except TypeError:
+	TracebackType = type(sys.exc_traceback)
+	FrameType = type(sys.exc_traceback.tb_frame)
+
+del sys, func, C, x			# These are not for export