Usage of python bytearray

Question

I was wondering whether using bytearray for constructing a string like.

def build_string(pairs):
    data = ''
    for key, value in pairs.iteritems():
        data = data + '\r\n' + '%s:%s' % (key, value)
    data = data + '\r\n\r\n'
    return data

would be slower than.

def build_string(pairs):
    data = bytearray()
    for key, value in pairs.iteritems():
        data.extend('%s:%s\r\n' % (key, value))
    data.extend('\r\n')
    return data

Brendan Abel · Accepted Answer · 2016-03-09 18:13:50Z

6

You should just use str.join()

You generally shouldn't need to include the carriage return (\r). Python has universal newline support. It will use the correct line ending for the OS.

return '\n'.join('{0}:{1}'.format(k, v) for k, v in pairs.iteritems()) + '\n\n'

answered Mar 9, 2016 at 18:13

Brendan Abel

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2 Comments

tau Over a year ago

i have used this code. codepad.org/zvHgPP0f it seems test2 is faster than both test1 and test3

Brendan Abel Over a year ago

@tau Only for short lists and short strings. Make the list longer, or use longer key and value strings and it gets exponentially worse. The bytearray version can actually be a bit faster, but it depends on whether you want to support non-ascii or not.

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