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Representation of the attributes of a file (or proxied file) for SFTP in
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with the same meanings as those returned by an `os.stat` object:
- ``st_size``
- ``st_uid``
- ``st_gid``
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- ``st_atime``
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Because SFTP allows flags to have other arbitrary named attributes, these
are stored in a dict named ``attr``. Occasionally, the filename is also
stored, in ``filename``.
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Create a new (empty) SFTPAttributes object. All fields will be empty.
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Create an `.SFTPAttributes` object from an existing ``stat`` object (an
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:param object obj: an object returned by `os.stat` (or equivalent).
:param str filename: the filename associated with this file.
:return: new `.SFTPAttributes` object with the same attribute fields.
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