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') if __name__ == '__main__': print(approximate_size(1000000000000, False)) print(approximate_size(1000000000000))
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