>The codec design allows extending the constructors using keyword
>arguments, however I'd rather not add a generic **kws argument
>to the base classes since this would hide errors (unknown or
>unsupported keywords, mispellings, etc.).
Isn't such an argument required at least for StreamReaderWriter,
because it actually instantiates two objects?
class StreamReaderWriter:
def __init__(self, stream, Reader, Writer, errors='strict'):
""" ...
Reader, Writer must be factory functions or classes
providing the StreamReader, StreamWriter interface resp.
"""
self.stream = stream
self.reader = Reader(stream, errors)
self.writer = Writer(stream, errors)
Hmm... you'd better not need to have two different set of keyword
arguments for Reader and Writer. Is that limitation acceptable? If
it is, then the list of changes becomes 1) add **kw to codecs.open,
and 2) add **kw to StreamReaderWriter's constructor, and apply it to
the Reader() and Writer() calls.
>The encoder and decoder functions must work stateless.
OK, then they're not suitable for encryption (in general, though
they'd work fine for ECB mode).
--amk
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