Arjen Nienhuis <a.g.nienh...@gmail.com> added the comment:

struct.pack does not work with variable length data. Something like:

b'{0:x}\r\n{1}\r\n'.format(len(block), block)

or

b'%x\r\n%s\r\n' % (len(block), block)

is not possible with struct.pack

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue3982>
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