- Fixed #853061: allow BZ2Compressor.compress() to receive an empty string

  as parameter.

Misc/NEWS

@@ -226,6 +226,9 @@ Extension modules
 - itertools.izip() with no arguments now returns an empty iterator instead
   of raising a TypeError exception.
 
+- Fixed #853061: allow BZ2Compressor.compress() to receive an empty string
+  as parameter.
+
 Library
 -------
 

Modules/bz2module.c

@@ -1503,6 +1503,9 @@ BZ2Comp_compress(BZ2CompObject *self, PyObject *args)
 	if (!PyArg_ParseTuple(args, "s#", &data, &datasize))
 		return NULL;
 
+	if (datasize == 0)
+		return PyString_FromString("");
+
 	ACQUIRE_LOCK(self);
 	if (!self->running) {
 		PyErr_SetString(PyExc_ValueError,