@@ -1415,11 +1415,11 @@ included in the :mod:`encodings` package). The codec uses mapping to encode and
14151415decode characters.
14161416
14171417Decoding mappings must map single string characters to single Unicode
1418- characters, integers (which are then interpreted as Unicode ordinals) or None
1418+ characters, integers (which are then interpreted as Unicode ordinals) or `` None``
14191419(meaning "undefined mapping" and causing an error).
14201420
14211421Encoding mappings must map single Unicode characters to single string
1422- characters, integers (which are then interpreted as Latin-1 ordinals) or None
1422+ characters, integers (which are then interpreted as Latin-1 ordinals) or `` None``
14231423(meaning "undefined mapping" and causing an error).
14241424
14251425The mapping objects provided must only support the __getitem__ mapping
@@ -1460,7 +1460,7 @@ The following codec API is special in that maps Unicode to Unicode.
14601460 *NULL * when an exception was raised by the codec.
14611461
14621462 The *mapping * table must map Unicode ordinal integers to Unicode ordinal
1463- integers or None (causing deletion of the character).
1463+ integers or `` None `` (causing deletion of the character).
14641464
14651465 Mapping tables need only provide the :meth:`__getitem__` interface; dictionaries
14661466 and sequences work well. Unmapped character ordinals (ones which cause a
@@ -1577,7 +1577,7 @@ They all return *NULL* or ``-1`` if an exception occurs.
15771577 resulting Unicode object.
15781578
15791579 The mapping table must map Unicode ordinal integers to Unicode ordinal integers
1580- or None (causing deletion of the character).
1580+ or `` None `` (causing deletion of the character).
15811581
15821582 Mapping tables need only provide the :meth:`__getitem__` interface; dictionaries
15831583 and sequences work well. Unmapped character ordinals (ones which cause a
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