python 文件大小显示kb、mb或gb等

SUFFIXES
=
{1000:
['KB',
'MB',
'GB',
'TB',
'PB',
'EB',
'ZB',
'YB'],

           
1024:
['KiB',
'MiB',
'GiB',
'TiB',
'PiB',
'EiB',
'ZiB',
'YiB']}

def
approximate_size(size,
a_kilobyte_is_1024_bytes=True):

    '''Convert a file size
to human-readable form.

    Keyword arguments:

    size -- file size in bytes

    a_kilobyte_is_1024_bytes -- if True (default), use multiples of 1024

                                if False, use multiples of 1000

    Returns: string

    '''

    if
size <
0:

        raise
ValueError('number
must be non-negative')

    multiple =
1024
if
a_kilobyte_is_1024_bytes else
1000

    for
suffix in
SUFFIXES[multiple]:

        size /=
multiple

        if
size <
multiple:

            return
'{0:.1f} {1}'.format(size,
suffix)

    raise
ValueError('number
too large')