Remove quotes from error message

Author: cmaloney

Lib/test/test_io/test_general.py

@@ -603,7 +603,7 @@ def readinto(self, b):
 
         with self.assertRaises(ValueError) as cm:
             Misbehaved(2).read(1)
-        self.assertEqual(str(cm.exception), "readinto returned '2' outside buffer size '1'")
+        self.assertEqual(str(cm.exception), "readinto returned 2 outside buffer size 1")
         for bad_size in (2147483647, sys.maxsize, -1, -1000):
             with self.assertRaises(ValueError):
                 Misbehaved(bad_size).read()

Modules/_io/iobase.c

@@ -948,7 +948,7 @@ _io__RawIOBase_read_impl(PyObject *self, Py_ssize_t n)
     if (bytes_filled < 0 || bytes_filled > n) {
         Py_DECREF(b);
         PyErr_Format(PyExc_ValueError,
-                     "readinto returned '%zd' outside buffer size '%zd'",
+                     "readinto returned %zd outside buffer size %zd",
                      bytes_filled, n);
         return NULL;
     }