If append mode is specified seek to the end of the file.

Add a test to test_fileio.py for this.

Lib/test/test_fileio.py

@@ -205,6 +205,24 @@ class OtherFileTests(unittest.TestCase):
         finally:
             os.unlink(TESTFN)
 
+    def testAppend(self):
+        try:
+            f = open(TESTFN, 'wb')
+            f.write(b'spam')
+            f.close()
+            f = open(TESTFN, 'ab')
+            f.write(b'eggs')
+            f.close()
+            f = open(TESTFN, 'rb')
+            d = f.read()
+            f.close()
+            self.assertEqual(d, b'spameggs')
+        finally:
+            try:
+                os.unlink(TESTFN)
+            except:
+                pass
+
 def test_main():
     # Historically, these tests have been sloppy about removing TESTFN.
     # So get rid of it no matter what.

Modules/_fileio.c

@@ -242,6 +242,18 @@ fileio_init(PyObject *oself, PyObject *args, PyObject *kwds)
 			PyErr_SetFromErrnoWithFilename(PyExc_IOError, name);
 			goto error;
 		}
+		if (append) {
+			int result;
+			Py_BEGIN_ALLOW_THREADS
+			errno = 0;
+			result = lseek(self->fd, 0, SEEK_END);
+			Py_END_ALLOW_THREADS
+			if (result < 0) {
+				close(self->fd);
+				PyErr_SetFromErrnoWithFilename(PyExc_IOError, name);
+				goto error;
+			}
+		}
 	}
 
 	goto done;