diff -r 53f2a1d311cd Lib/test/test_float.py
--- a/Lib/test/test_float.py	Wed Nov 04 09:03:53 2015 +0100
+++ b/Lib/test/test_float.py	Wed Nov 04 15:49:37 2015 +0200
@@ -31,7 +31,6 @@ class GeneralFloatCases(unittest.TestCas
         self.assertEqual(float(3.14), 3.14)
         self.assertEqual(float(314), 314.0)
         self.assertEqual(float("  3.14  "), 3.14)
-        self.assertEqual(float(b" 3.14  "), 3.14)
         self.assertRaises(ValueError, float, "  0x3.1  ")
         self.assertRaises(ValueError, float, "  -0x3.p-1  ")
         self.assertRaises(ValueError, float, "  +0x3.p-1  ")
@@ -43,7 +42,6 @@ class GeneralFloatCases(unittest.TestCas
         self.assertRaises(ValueError, float, "+.inf")
         self.assertRaises(ValueError, float, ".")
         self.assertRaises(ValueError, float, "-.")
-        self.assertRaises(ValueError, float, b"-")
         self.assertRaises(TypeError, float, {})
         self.assertRaisesRegex(TypeError, "not 'dict'", float, {})
         # Lone surrogate
@@ -57,6 +55,41 @@ class GeneralFloatCases(unittest.TestCas
         float(b'.' + b'1'*1000)
         float('.' + '1'*1000)
 
+    def test_non_numeric_input_types(self):
+        # Test possible non-numeric types for the argument x, including
+        # subclasses of the explicitly documented accepted types.
+        class CustomStr(str): pass
+        class CustomBytes(bytes): pass
+        class CustomByteArray(bytearray): pass
+
+        factories = [
+            bytes,
+            bytearray,
+            lambda b: CustomStr(b.decode()),
+            CustomBytes,
+            CustomByteArray,
+            memoryview,
+        ]
+        try:
+            from array import array
+        except ImportError:
+            pass
+        else:
+            factories.append(lambda b: array('B', b))
+
+        for f in factories:
+            x = f(b" 3.14  ")
+            with self.subTest(type(x)):
+                self.assertEqual(float(x), 3.14)
+                self.assertRaises(ValueError, float, f(b'A' * 0x10))
+
+    def test_float_memoryview(self):
+        self.assertEqual(float(memoryview(b'12.3')[1:4]), 2.3)
+        self.assertEqual(float(memoryview(b'12.3\x00')[1:4]), 2.3)
+        self.assertEqual(float(memoryview(b'12.3 ')[1:4]), 2.3)
+        self.assertEqual(float(memoryview(b'12.3A')[1:4]), 2.3)
+        self.assertEqual(float(memoryview(b'12.34')[1:4]), 2.3)
+
     def test_error_message(self):
         testlist = ('\xbd', '123\xbd', '  123 456  ')
         for s in testlist:
diff -r 53f2a1d311cd Lib/test/test_int.py
--- a/Lib/test/test_int.py	Wed Nov 04 09:03:53 2015 +0100
+++ b/Lib/test/test_int.py	Wed Nov 04 15:49:37 2015 +0200
@@ -276,16 +276,37 @@ class IntTestCases(unittest.TestCase):
         class CustomBytes(bytes): pass
         class CustomByteArray(bytearray): pass
 
-        values = [b'100',
-                  bytearray(b'100'),
-                  CustomStr('100'),
-                  CustomBytes(b'100'),
-                  CustomByteArray(b'100')]
+        factories = [
+            bytes,
+            bytearray,
+            lambda b: CustomStr(b.decode()),
+            CustomBytes,
+            CustomByteArray,
+            memoryview,
+        ]
+        try:
+            from array import array
+        except ImportError:
+            pass
+        else:
+            factories.append(lambda b: array('B', b))
 
-        for x in values:
-            msg = 'x has type %s' % type(x).__name__
-            self.assertEqual(int(x), 100, msg=msg)
-            self.assertEqual(int(x, 2), 4, msg=msg)
+        for f in factories:
+            x = f(b'100')
+            with self.subTest(type(x)):
+                self.assertEqual(int(x), 100)
+                if isinstance(x, (str, bytes, bytearray)):
+                    self.assertEqual(int(x, 2), 4)
+                else:
+                    self.assertRaises(TypeError, int, x, 2)
+                self.assertRaises(ValueError, int, f(b'A' * 0x10))
+
+    def test_int_memoryview(self):
+        self.assertEqual(int(memoryview(b'123')[1:3]), 23)
+        self.assertEqual(int(memoryview(b'123\x00')[1:3]), 23)
+        self.assertEqual(int(memoryview(b'123 ')[1:3]), 23)
+        self.assertEqual(int(memoryview(b'123A')[1:3]), 23)
+        self.assertEqual(int(memoryview(b'1234')[1:3]), 23)
 
     def test_string_float(self):
         self.assertRaises(ValueError, int, '1.2')
diff -r 53f2a1d311cd Objects/abstract.c
--- a/Objects/abstract.c	Wed Nov 04 09:03:53 2015 +0100
+++ b/Objects/abstract.c	Wed Nov 04 15:49:37 2015 +0200
@@ -1309,12 +1309,30 @@ PyNumber_Long(PyObject *o)
         /* The below check is done in PyLong_FromUnicode(). */
         return PyLong_FromUnicodeObject(o, 10);
 
-    if (PyObject_GetBuffer(o, &view, PyBUF_SIMPLE) == 0) {
+    if (PyBytes_Check(o))
         /* need to do extra error checking that PyLong_FromString()
          * doesn't do.  In particular int('9\x005') must raise an
          * exception, not truncate at the null.
          */
-        PyObject *result = _PyLong_FromBytes(view.buf, view.len, 10);
+        return _PyLong_FromBytes(PyBytes_AS_STRING(o),
+                                 PyBytes_GET_SIZE(o), 10);
+
+    if (PyByteArray_Check(o))
+        return _PyLong_FromBytes(PyByteArray_AS_STRING(o),
+                                 PyByteArray_GET_SIZE(o), 10);
+
+    if (PyObject_GetBuffer(o, &view, PyBUF_SIMPLE) == 0) {
+        PyObject *result, *bytes;
+
+        /* Copy to NUL-terminated buffer. */
+        bytes = PyBytes_FromStringAndSize((const char *)view.buf, view.len);
+        if (bytes == NULL) {
+            PyBuffer_Release(&view);
+            return NULL;
+        }
+        result = _PyLong_FromBytes(PyBytes_AS_STRING(bytes),
+                                   PyBytes_GET_SIZE(bytes), 10);
+        Py_DECREF(bytes);
         PyBuffer_Release(&view);
         return result;
     }
diff -r 53f2a1d311cd Objects/complexobject.c
--- a/Objects/complexobject.c	Wed Nov 04 09:03:53 2015 +0100
+++ b/Objects/complexobject.c	Wed Nov 04 15:49:37 2015 +0200
@@ -767,7 +767,6 @@ complex_subtype_from_string(PyTypeObject
     int got_bracket=0;
     PyObject *s_buffer = NULL;
     Py_ssize_t len;
-    Py_buffer view = {NULL, NULL};
 
     if (PyUnicode_Check(v)) {
         s_buffer = _PyUnicode_TransformDecimalAndSpaceToASCII(v);
@@ -777,10 +776,6 @@ complex_subtype_from_string(PyTypeObject
         if (s == NULL)
             goto error;
     }
-    else if (PyObject_GetBuffer(v, &view, PyBUF_SIMPLE) == 0) {
-        s = (const char *)view.buf;
-        len = view.len;
-    }
     else {
         PyErr_Format(PyExc_TypeError,
             "complex() argument must be a string or a number, not '%.200s'",
@@ -895,7 +890,6 @@ complex_subtype_from_string(PyTypeObject
     if (s-start != len)
         goto parse_error;
 
-    PyBuffer_Release(&view);
     Py_XDECREF(s_buffer);
     return complex_subtype_from_doubles(type, x, y);
 
@@ -903,7 +897,6 @@ complex_subtype_from_string(PyTypeObject
     PyErr_SetString(PyExc_ValueError,
                     "complex() arg is a malformed string");
   error:
-    PyBuffer_Release(&view);
     Py_XDECREF(s_buffer);
     return NULL;
 }
diff -r 53f2a1d311cd Objects/floatobject.c
--- a/Objects/floatobject.c	Wed Nov 04 09:03:53 2015 +0100
+++ b/Objects/floatobject.c	Wed Nov 04 15:49:37 2015 +0200
@@ -144,9 +144,24 @@ PyFloat_FromString(PyObject *v)
             return NULL;
         }
     }
+    else if (PyBytes_Check(v)) {
+        s = PyBytes_AS_STRING(v);
+        len = PyBytes_GET_SIZE(v);
+    }
+    else if (PyByteArray_Check(v)) {
+        s = PyByteArray_AS_STRING(v);
+        len = PyByteArray_GET_SIZE(v);
+    }
     else if (PyObject_GetBuffer(v, &view, PyBUF_SIMPLE) == 0) {
         s = (const char *)view.buf;
         len = view.len;
+        /* Copy to NUL-terminated buffer. */
+        s_buffer = PyBytes_FromStringAndSize(s, len);
+        if (s_buffer == NULL) {
+            PyBuffer_Release(&view);
+            return NULL;
+        }
+        s = PyBytes_AS_STRING(s_buffer);
     }
     else {
         PyErr_Format(PyExc_TypeError,