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"""Bits and bytes related humanization."""
suffixes = {
"decimal": ("kB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"),
"binary": ("KiB", "MiB", "GiB", "TiB", "PiB", "EiB", "ZiB", "YiB"),
"gnu": "KMGTPEZY",
}
def naturalsize(value, binary=False, gnu=False, format="%.1f"):
"""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.
"""
if gnu:
suffix = suffixes["gnu"]
elif binary:
suffix = suffixes["binary"]
else:
suffix = suffixes["decimal"]
base = 1024 if (gnu or binary) else 1000
bytes = float(value)
abs_bytes = abs(bytes)
if abs_bytes == 1 and not gnu:
return "%d Byte" % bytes
elif abs_bytes < base and not gnu:
return "%d Bytes" % bytes
elif abs_bytes < base and gnu:
return "%dB" % bytes
for i, s in enumerate(suffix):
unit = base ** (i + 2)
if abs_bytes < unit and not gnu:
return (format + " %s") % ((base * bytes / unit), s)
elif abs_bytes < unit and gnu:
return (format + "%s") % ((base * bytes / unit), s)
if gnu:
return (format + "%s") % ((base * bytes / unit), s)
return (format + " %s") % ((base * bytes / unit), s)