File size: 1,884 Bytes
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"""Functions for reporting filesizes. Borrowed from https://github.com/PyFilesystem/pyfilesystem2
The functions declared in this module should cover the different
usecases needed to generate a string representation of a file size
using several different units. Since there are many standards regarding
file size units, three different functions have been implemented.
See Also:
* `Wikipedia: Binary prefix <https://en.wikipedia.org/wiki/Binary_prefix>`_
"""
__all__ = ["decimal"]
from typing import Iterable, List, Tuple
def _to_str(size: int, suffixes: Iterable[str], base: int) -> str:
if size == 1:
return "1 byte"
elif size < base:
return "{:,} bytes".format(size)
for i, suffix in enumerate(suffixes, 2): # noqa: B007
unit = base ** i
if size < unit:
break
return "{:,.1f} {}".format((base * size / unit), suffix)
def pick_unit_and_suffix(size: int, suffixes: List[str], base: int) -> Tuple[int, str]:
"""Pick a suffix and base for the given size."""
for i, suffix in enumerate(suffixes):
unit = base ** i
if size < unit * base:
break
return unit, suffix
def decimal(size: int) -> str:
"""Convert a filesize in to a string (powers of 1000, SI prefixes).
In this convention, ``1000 B = 1 kB``.
This is typically the format used to advertise the storage
capacity of USB flash drives and the like (*256 MB* meaning
actually a storage capacity of more than *256 000 000 B*),
or used by **Mac OS X** since v10.6 to report file sizes.
Arguments:
int (size): A file size.
Returns:
`str`: A string containing a abbreviated file size and units.
Example:
>>> filesize.decimal(30000)
'30.0 kB'
"""
return _to_str(size, ("kB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"), 1000)
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