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Interface to the liblzma compression library.

This module provides a class for reading and writing compressed files,
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A file object providing transparent LZMA (de)compression.

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        mode can be "r" for reading (default), "w" for (over)writing,
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        format specifies the container format to use for the file.
        If mode is "r", this defaults to FORMAT_AUTO. Otherwise, the
        default is FORMAT_XZ.

        check specifies the integrity check to use. This argument can
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        omitted, or be CHECK_NONE.

        When opening a file for reading, the *preset* argument is not
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        When opening a file for writing, the settings used by the
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        level (with the *preset* argument), or in detail as a custom
        filter chain (with the *filters* argument). For FORMAT_XZ and
        FORMAT_ALONE, the default is to use the PRESET_DEFAULT preset
        level. For FORMAT_RAW, the caller must always specify a filter
        chain; the raw compressor does not support preset compression
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        preset (if provided) should be an integer in the range 0-9,
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