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    Given a path with elements separated by
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    >>> list(_parents('b/d'))
    ['b']
    >>> list(_parents('/b/d/'))
    ['/b']
    >>> list(_parents('b/d/f/'))
    ['b/d', 'b']
    >>> list(_parents('b'))
    []
    >>> list(_parents(''))
    []
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    Given a path with elements separated by
    posixpath.sep, generate all elements of that path

    >>> list(_ancestry('b/d'))
    ['b/d', 'b']
    >>> list(_ancestry('/b/d/'))
    ['/b/d', '/b']
    >>> list(_ancestry('b/d/f/'))
    ['b/d/f', 'b/d', 'b']
    >>> list(_ancestry('b'))
    ['b']
    >>> list(_ancestry(''))
    []
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    ZipFile mix-in to ensure names are sanitized.
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        Ensure a relative path with posix separators and no dot names.
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        https://github.com/python/cpython/blob/bcc1be39cb1d04ad9fc0bd1b9193d3972835a57c/Lib/zipfile/__init__.py#L1799-L1813
        but provides consistent cross-platform behavior.
        >>> san = SanitizedNames._sanitize
        >>> san('/foo/bar')
        'foo/bar'
        >>> san('//foo.txt')
        'foo.txt'
        >>> san('foo/.././bar.txt')
        'foo/bar.txt'
        >>> san('foo../.bar.txt')
        'foo../.bar.txt'
        >>> san('\\foo\\bar.txt')
        'foo/bar.txt'
        >>> san('D:\\foo.txt')
        'D/foo.txt'
        >>> san('\\\\server\\share\\file.txt')
        'server/share/file.txt'
        >>> san('\\\\?\\GLOBALROOT\\Volume3')
        '?/GLOBALROOT/Volume3'
        >>> san('\\\\.\\PhysicalDrive1\\root')
        'PhysicalDrive1/root'
        Retain any trailing slash.
        >>> san('abc/')
        'abc/'
        Raises a ValueError if the result is empty.
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        ValueError: Empty filename
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    A pathlib-compatible interface for zip files.

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        .
        ├── a.txt
        └── b
            ├── c.txt
            └── d
                └── e.txt

    >>> data = io.BytesIO()
    >>> zf = zipfile.ZipFile(data, 'w')
    >>> zf.writestr('a.txt', 'content of a')
    >>> zf.writestr('b/c.txt', 'content of c')
    >>> zf.writestr('b/d/e.txt', 'content of e')
    >>> zf.filename = 'abcde.zip'

    Path accepts the zipfile object itself or a filename

    >>> root = Path(zf)

    From there, several path operations are available.

    Directory iteration (including the zip file itself):

    >>> a, b = root.iterdir()
    >>> a
    Path('abcde.zip', 'a.txt')
    >>> b
    Path('abcde.zip', 'b/')

    name property:

    >>> b.name
    'b'

    join with divide operator:

    >>> c = b / 'c.txt'
    >>> c
    Path('abcde.zip', 'b/c.txt')
    >>> c.name
    'c.txt'

    Read text:

    >>> c.read_text()
    'content of c'

    existence:

    >>> c.exists()
    True
    >>> (b / 'missing.txt').exists()
    False

    Coercion to string:

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    'abcde.zip/b/c.txt'
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