TEST: Use standard encode/decode

Author: effigies

nibabel/tests/test_openers.py

@@ -341,10 +341,10 @@ def test_iter():
         for input, does_t in files_to_test:
             with Opener(input, 'wb') as fobj:
                 for line in lines:
-                    fobj.write(bytes(line + os.linesep, 'ascii'))
+                    fobj.write(str.encode(line + os.linesep))
             with Opener(input, 'rb') as fobj:
                 for back_line, line in zip(fobj, lines):
-                    assert back_line.decode('latin-1').rstrip() == line
+                    assert back_line.decode().rstrip() == line
             if not does_t:
                 continue
             with Opener(input, 'rt') as fobj: