python humanize bytes

humanbytes.py

#Humanize byte size figures
def humanize_bytes(bytesize, precision=2):
    abbrevs = (
        (1<<50, 'PB'),
        (1<<40, 'TB'),
        (1<<30, 'GB'),
        (1<<20, 'MB'),
        (1<<10, 'kB'),
        (1, 'bytes')
    )
    if bytesize == 1:
        return '1 byte'
    for factor, suffix in abbrevs:
        if bytesize >= factor:
            break
    return '%.*f %s' % (precision, bytesize / factor, suffix)

Tried out this code. I was passing in longs from os.stat for bytesize and factor is going to be either int or long, so you always get whole numbers. I'm not sure what the point of the precision was in that case, so I changed factor to be a float. Also, having a decimal point for bytes didn't make sense to me. If those things matter for you, try this:

def humanize_bytes(bytesize, precision=2):
    """
    Humanize byte size figures
    """
    abbrevs = (
        (1 << 50, 'PB'),
        (1 << 40, 'TB'),
        (1 << 30, 'GB'),
        (1 << 20, 'MB'),
        (1 << 10, 'kB'),
        (1, 'bytes')
    )
    if bytesize == 1:
        return '1 byte'
    for factor, suffix in abbrevs:
        if bytesize >= factor:
            break
    if factor == 1:
        precision = 0
    return '%.*f %s' % (precision, bytesize / float(factor), suffix)