Fix the ctypes tests. Patch from Victor Stinner. He writes:

The problem is that ctypes c_char (and c_char_p) creates unicode string
instead of byte string. I attached a proposition (patch) to change this
behaviour (use bytes for c_char).

So in next example, it will display 'bytes' and not 'str':
  from ctypes import c_buffer, c_char
  buf = c_buffer("abcdef")
  print (type(buf[0]))

Other behaviour changes:
 - repr(c_char) adds a "b"
   eg. repr(c_char('x')) is "c_char(b'x')" instead of "c_char('x')"
 - bytes is mutable whereas str is not:
   this may break some modules based on ctypes

1 files changed, 1 insertions, 1 deletions

diff --git a/Modules/_ctypes/cfield.c b/Modules/_ctypes/cfield.c
index cc94850..f60dede 100644
--- a/Modules/_ctypes/cfield.c
+++ b/Modules/_ctypes/cfield.c
@@ -1156,7 +1156,7 @@ c_set(void *ptr, PyObject *value, Py_ssize_t size)
 static PyObject *
 c_get(void *ptr, Py_ssize_t size)
 {
-	return PyUnicode_FromStringAndSize((char *)ptr, 1);
+	return PyBytes_FromStringAndSize((char *)ptr, 1);
 }
 
 #ifdef CTYPES_UNICODE