[issue3982] support .format for bytes

Arjen Nienhuis report at bugs.python.org
Sat Jul 11 15:54:40 CEST 2009


Arjen Nienhuis <a.g.nienhuis at gmail.com> added the comment:

There are many binary formats that use ASCII numbers.

'HTTP chunking' uses ASCII mixed with binary (octets).

With 2.6 you could write:

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

With 3.0 you'd have to write this:

def chunk(block):
    return format(len(block), 'x').encode('ascii') + b'\r\n' + block +
b'\r\n'

You cannot convert to ascii at the end of the pipeline as there are
bytes > 127 in the data blocks.

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nosy: +arjennienhuis

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