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a Format a number of bytes like a human readable filesize (e.g. 10 kB).
By default, decimal suffixes (kB, MB) are used.
Non-GNU modes are compatible with jinja2's `filesizeformat` filter.
Examples:
```pycon
>>> naturalsize(3000000)
'3.0 MB'
>>> naturalsize(300, False, True)
'300B'
>>> naturalsize(3000, False, True)
'2.9K'
>>> naturalsize(3000, False, True, "%.3f")
'2.930K'
>>> naturalsize(3000, True)
'2.9 KiB'
```
Args:
value (int, float, str): Integer to convert.
binary (bool): If `True`, uses binary suffixes (KiB, MiB) with base
2<sup>10</sup> instead of 10<sup>3</sup>.
gnu (bool): If `True`, the binary argument is ignored and GNU-style
(`ls -sh` style) prefixes are used (K, M) with the 2**10 definition.
format (str): Custom formatter.
Returns:
str: Human readable representation of a filesize.
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