90 lines
2.4 KiB
Python
90 lines
2.4 KiB
Python
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# coding: utf-8
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"""Functions for reporting filesizes. Borrowed from https://github.com/PyFilesystem/pyfilesystem2
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The functions declared in this module should cover the different
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use cases needed to generate a string representation of a file size
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using several different units. Since there are many standards regarding
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file size units, three different functions have been implemented.
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See Also:
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* `Wikipedia: Binary prefix <https://en.wikipedia.org/wiki/Binary_prefix>`_
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"""
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__all__ = ["decimal"]
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from typing import Iterable, List, Optional, Tuple
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def _to_str(
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size: int,
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suffixes: Iterable[str],
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base: int,
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*,
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precision: Optional[int] = 1,
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separator: Optional[str] = " ",
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) -> str:
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if size == 1:
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return "1 byte"
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elif size < base:
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return "{:,} bytes".format(size)
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for i, suffix in enumerate(suffixes, 2): # noqa: B007
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unit = base**i
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if size < unit:
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break
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return "{:,.{precision}f}{separator}{}".format(
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(base * size / unit),
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suffix,
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precision=precision,
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separator=separator,
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)
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def pick_unit_and_suffix(size: int, suffixes: List[str], base: int) -> Tuple[int, str]:
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"""Pick a suffix and base for the given size."""
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for i, suffix in enumerate(suffixes):
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unit = base**i
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if size < unit * base:
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break
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return unit, suffix
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def decimal(
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size: int,
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*,
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precision: Optional[int] = 1,
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separator: Optional[str] = " ",
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) -> str:
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"""Convert a filesize in to a string (powers of 1000, SI prefixes).
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In this convention, ``1000 B = 1 kB``.
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This is typically the format used to advertise the storage
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capacity of USB flash drives and the like (*256 MB* meaning
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actually a storage capacity of more than *256 000 000 B*),
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or used by **Mac OS X** since v10.6 to report file sizes.
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Arguments:
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int (size): A file size.
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int (precision): The number of decimal places to include (default = 1).
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str (separator): The string to separate the value from the units (default = " ").
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Returns:
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`str`: A string containing a abbreviated file size and units.
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Example:
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>>> filesize.decimal(30000)
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'30.0 kB'
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>>> filesize.decimal(30000, precision=2, separator="")
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'30.00kB'
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"""
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return _to_str(
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size,
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("kB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"),
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1000,
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precision=precision,
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separator=separator,
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)
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