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-rw-r--r--Doc/library/codecs.rst9
1 files changed, 9 insertions, 0 deletions
diff --git a/Doc/library/codecs.rst b/Doc/library/codecs.rst
index c6b6a56..aa1d123 100644
--- a/Doc/library/codecs.rst
+++ b/Doc/library/codecs.rst
@@ -224,6 +224,10 @@ wider range of codecs when working with binary files:
The *errors* argument (as well as any
other keyword argument) is passed through to the incremental encoder.
+ This function requires that the codec accept text :class:`str` objects
+ to encode. Therefore it does not support bytes-to-bytes encoders such as
+ ``base64_codec``.
+
.. function:: iterdecode(iterator, encoding, errors='strict', **kwargs)
@@ -232,6 +236,11 @@ wider range of codecs when working with binary files:
The *errors* argument (as well as any
other keyword argument) is passed through to the incremental decoder.
+ This function requires that the codec accept :class:`bytes` objects
+ to decode. Therefore it does not support text-to-text encoders such as
+ ``rot_13``, although ``rot_13`` may be used equivalently with
+ :func:`iterencode`.
+
The module also provides the following constants which are useful for reading
and writing to platform dependent files: