Breaking ground for PEP 3137 implementation:

Get rid of buffer().  Use memoryview() in its place where possible.
In a few places, do things a bit different, because memoryview()
can't slice (yet).

Lib/sqlite3/dbapi2.py

@@ -50,7 +50,7 @@ def TimestampFromTicks(ticks):
 version_info = tuple([int(x) for x in version.split(".")])
 sqlite_version_info = tuple([int(x) for x in sqlite_version.split(".")])
 
-Binary = buffer
+Binary = memoryview
 
 def register_adapters_and_converters():
     def adapt_date(val):

Lib/sqlite3/test/dbapi.py

@@ -593,7 +593,7 @@ class ConstructorTests(unittest.TestCase):
         ts = sqlite.TimestampFromTicks(42)
 
     def CheckBinary(self):
-        b = sqlite.Binary(chr(0) + "'")
+        b = sqlite.Binary(b"\0'")
 
 class ExtensionTests(unittest.TestCase):
     def CheckScriptStringSql(self):

Lib/sqlite3/test/types.py

@@ -62,7 +62,7 @@ class SqliteTypeTests(unittest.TestCase):
         self.failUnlessEqual(row[0], val)
 
     def CheckBlob(self):
-        val = buffer(b"Guglhupf")
+        val = memoryview(b"Guglhupf")
         self.cur.execute("insert into test(b) values (?)", (val,))
         self.cur.execute("select b from test")
         row = self.cur.fetchone()
@@ -203,7 +203,7 @@ class DeclTypesTests(unittest.TestCase):
 
     def CheckBlob(self):
         # default
-        val = buffer(b"Guglhupf")
+        val = memoryview(b"Guglhupf")
         self.cur.execute("insert into test(bin) values (?)", (val,))
         self.cur.execute("select bin from test")
         row = self.cur.fetchone()
@@ -305,7 +305,7 @@ class BinaryConverterTests(unittest.TestCase):
 
     def CheckBinaryInputForConverter(self):
         testdata = b"abcdefg" * 10
-        result = self.con.execute('select ? as "x [bin]"', (buffer(bz2.compress(testdata)),)).fetchone()[0]
+        result = self.con.execute('select ? as "x [bin]"', (memoryview(bz2.compress(testdata)),)).fetchone()[0]
         self.failUnlessEqual(testdata, result)
 
 class DateTimeTests(unittest.TestCase):

Lib/sqlite3/test/userfunctions.py

@@ -36,7 +36,7 @@ def func_returnfloat():
 def func_returnnull():
     return None
 def func_returnblob():
-    return buffer(b"blob")
+    return b"blob"
 def func_raiseexception():
     5/0
 
@@ -49,7 +49,7 @@ def func_isfloat(v):
 def func_isnone(v):
     return type(v) is type(None)
 def func_isblob(v):
-    return type(v) is buffer
+    return isinstance(v, (bytes, memoryview))
 
 class AggrNoStep:
     def __init__(self):
@@ -100,7 +100,8 @@ class AggrCheckType:
         self.val = None
 
     def step(self, whichType, val):
-        theType = {"str": str, "int": int, "float": float, "None": type(None), "blob": buffer}
+        theType = {"str": str, "int": int, "float": float, "None": type(None),
+                   "blob": bytes}
         self.val = int(theType[whichType] is type(val))
 
     def finalize(self):
@@ -196,8 +197,8 @@ class FunctionTests(unittest.TestCase):
         cur = self.con.cursor()
         cur.execute("select returnblob()")
         val = cur.fetchone()[0]
-        self.failUnlessEqual(type(val), buffer)
-        self.failUnlessEqual(val, buffer(b"blob"))
+        self.failUnlessEqual(type(val), bytes)
+        self.failUnlessEqual(val, memoryview(b"blob"))
 
     def CheckFuncException(self):
         cur = self.con.cursor()
@@ -234,7 +235,7 @@ class FunctionTests(unittest.TestCase):
 
     def CheckParamBlob(self):
         cur = self.con.cursor()
-        cur.execute("select isblob(?)", (buffer(b"blob"),))
+        cur.execute("select isblob(?)", (memoryview(b"blob"),))
         val = cur.fetchone()[0]
         self.failUnlessEqual(val, 1)
 
@@ -252,7 +253,7 @@ class AggregateTests(unittest.TestCase):
                 )
             """)
         cur.execute("insert into test(t, i, f, n, b) values (?, ?, ?, ?, ?)",
-            ("foo", 5, 3.14, None, buffer(b"blob"),))
+            ("foo", 5, 3.14, None, memoryview(b"blob"),))
 
         self.con.create_aggregate("nostep", 1, AggrNoStep)
         self.con.create_aggregate("nofinalize", 1, AggrNoFinalize)
@@ -344,7 +345,7 @@ class AggregateTests(unittest.TestCase):
 
     def CheckAggrCheckParamBlob(self):
         cur = self.con.cursor()
-        cur.execute("select checkType('blob', ?)", (buffer(b"blob"),))
+        cur.execute("select checkType('blob', ?)", (memoryview(b"blob"),))
         val = cur.fetchone()[0]
         self.failUnlessEqual(val, 1)