Mike Orr wrote:
> Nobody has followed up with suggestions for a better API spec. Should
> I ask again for volunteers, leave the ticket open, or just close it?
> My concern is this is too implementation-specific an issue to come up
> with an API that would work for a wide variety of users, which is our
> threshold for helper acceptance.
In the attached file you can find my proposal for the function name,
spec and implementation.
What do you think about it? Feel free to modify if anyone has an idea of
how to improve it.
Regards,
Wojciech Malinowski
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def format_data_size(size, precision=1, binary_prefix=True, full_name=False, unit='byte'):
if unit not in ('bit', 'byte'):
raise Exception('Unknown unit')
if not full_name and unit=='byte':
unit = 'B'
if not binary_prefix:
base = 1000
if full_name:
multiples = ('', 'kilo', 'mega', 'giga', 'tera', 'peta', 'exa', 'zetta', 'yotta')
else:
multiples = ('', 'k', 'M', 'G', 'T', 'P', 'E', 'Z', 'Y')
else:
base = 1024
if full_name:
multiples = ('', 'kibi', 'mebi', 'gibi', 'tebi', 'pebi', 'exbi', 'zebi', 'yobi')
else:
multiples = ('', 'Ki', 'Mi', 'Gi', 'Ti', 'Pi', 'Ei', 'Zi', 'Yi')
from math import log, pow
m = int(log(size) / log(base))
if m > 8:
m = 8
if m == 0:
precision = '%.0f'
else:
precision = '%%.%df' % precision
size = precision % (size / pow(base, m))
return '%s %s%s' % (size.strip(), multiples[m], unit)
if __name__ == '__main__':
assert format_data_size(1) == '1 B'
assert format_data_size(1000) == '1000 B'
assert format_data_size(1024, 0) == '1 KiB'
assert format_data_size(1024, 2) == '1.00 KiB'
assert format_data_size(1024, 0, False) == '1 kB'
assert format_data_size(1024, 2, False) == '1.02 kB'
assert format_data_size(1024, 0, False, True) == '1 kilobyte'
assert format_data_size(1024, 2, False, True) == '1.02 kilobyte'
assert format_data_size(1024, 0, False, True, 'bit') == '1 kilobit'
assert format_data_size(1024, 2, False, True, 'bit') == '1.02 kilobit'
assert format_data_size(12345678, 2, True) == '11.77 MiB'
assert format_data_size(12345678, 2, False) == '12.35 MB'
assert format_data_size(12345678901234, 2, True) == '11.23 TiB'
assert format_data_size(12345678901234, 2, False) == '12.35 TB'
assert format_data_size(1234567890123456789012, 2, True) == '1.05 ZiB'
assert format_data_size(1234567890123456789012, 2, False) == '1.23 ZB'
assert format_data_size(123456789012345678901234567890, 2, True) == '102121.06 YiB'
assert format_data_size(123456789012345678901234567890, 2, False) == '123456.79 YB'
