<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def save(self, out, kind=None, **kw):
 """\ Serializes the QR Code in one of the supported formats. The serialization format depends on the filename extension. **Common keywords** ========== ============================================================== Name Description ========== ============================================================== scale Integer or float indicating the size of a single module. Default: 1. The interpretation of the scaling factor depends on the serializer. For pixel-based output (like PNG) the scaling factor is interepreted as pixel-size (1 = 1 pixel). EPS interprets ``1`` as 1 point (1/72 inch) per module. Some serializers (like SVG) accept float values. If the serializer does not accept float values, the value will be converted to an integer value (note: int(1.6) == 1). border Integer indicating the size of the quiet zone. If set to ``None`` (default), the recommended border size will be used (``4`` for QR Codes, ``2`` for a Micro QR Codes). color A string or tuple representing a color value for the dark modules. The default value is "black". The color can be provided as ``(R, G, B)`` tuple, as web color name (like "red") or in hexadecimal format (``#RGB`` or ``#RRGGBB``). Some serializers (SVG and PNG) accept an alpha transparency value like ``#RRGGBBAA``. background A string or tuple representing a color for the light modules or background. See "color" for valid values. The default value depends on the serializer. SVG uses no background color (``None``) by default, other serializers use "white" as default background color. ========== ============================================================== **Scalable Vector Graphics (SVG)** ============= ============================================================== Name Description ============= ============================================================== out Filename or io.BytesIO kind "svg" or "svgz" (to create a gzip compressed SVG) scale integer or float color Default: "#000" (black) ``None`` is a valid value. If set to ``None``, the resulting path won't have a "stroke" attribute. The "stroke" attribute may be defined via CSS (external). If an alpha channel is defined, the output depends of the used SVG version. For SVG versions >= 2.0, the "stroke" attribute will have a value like "rgba(R, G, B, A)", otherwise the path gets another attribute "stroke-opacity" to emulate the alpha channel. To minimize the document size, the SVG serializer uses automatically the shortest color representation: If a value like "#000000" is provided, the resulting document will have a color value of "#000". If the color is "#FF0000", the resulting color is not "#F00", but the web color name "red". background Default value ``None``. If this paramater is set to another value, the resulting image will have another path which is used to define the background color. If an alpha channel is used, the resulting path may have a "fill-opacity" attribute (for SVG version < 2.0) or the "fill" attribute has a "rgba(R, G, B, A)" value. See keyword "color" for further details. xmldecl Boolean value (default: ``True``) indicating whether the document should have an XML declaration header. Set to ``False`` to omit the header. svgns Boolean value (default: ``True``) indicating whether the document should have an explicit SVG namespace declaration. Set to ``False`` to omit the namespace declaration. The latter might be useful if the document should be embedded into a HTML 5 document where the SVG namespace is implicitly defined. title String (default: ``None``) Optional title of the generated SVG document. desc String (default: ``None``) Optional description of the generated SVG document. svgid A string indicating the ID of the SVG document (if set to ``None`` (default), the SVG element won't have an ID). svgclass Default: "segno". The CSS class of the SVG document (if set to ``None``, the SVG element won't have a class). lineclass Default: "qrline". The CSS class of the path element (which draws the dark modules (if set to ``None``, the path won't have a class). omitsize Indicates if width and height attributes should be omitted (default: ``False``). If these attributes are omitted, a ``viewBox`` attribute will be added to the document. unit Default: ``None`` Inidctaes the unit for width / height and other coordinates. By default, the unit is unspecified and all values are in the user space. Valid values: em, ex, px, pt, pc, cm, mm, in, and percentages (any string is accepted, this parameter is not validated by the serializer) encoding Encoding of the XML document. "utf-8" by default. svgversion SVG version (default: ``None``). If specified (a float), the resulting document has an explicit "version" attribute. If set to ``None``, the document won't have a "version" attribute. This parameter is not validated. compresslevel Default: 9. This parameter is only valid, if a compressed SVG document should be created (file extension "svgz"). 1 is fastest and produces the least compression, 9 is slowest and produces the most. 0 is no compression. ============= ============================================================== **Portable Network Graphics (PNG)** ============= ============================================================== Name Description ============= ============================================================== out Filename or io.BytesIO kind "png" scale integer color Default: "#000" (black) ``None`` is a valid value iff background is not ``None``. background Default value ``#fff`` (white) See keyword "color" for further details. compresslevel Default: 9. Integer indicating the compression level for the ``IDAT`` (data) chunk. 1 is fastest and produces the least compression, 9 is slowest and produces the most. 0 is no compression. dpi Default: None. Specifies the DPI value for the image. By default, the DPI value is unspecified. Please note that the DPI value is converted into meters (maybe with rounding errors) since PNG does not support the unit "dots per inch". addad Boolean value (default: True) to (dis-)allow a "Software" comment indicating that the file was created by Segno. ============= ============================================================== **Encapsulated PostScript (EPS)** ============= ============================================================== Name Description ============= ============================================================== out Filename or io.StringIO kind "eps" scale integer or float color Default: "#000" (black) background Default value: ``None`` (no background) ============= ============================================================== **Portable Document Format (PDF)** ============= ============================================================== Name Description ============= ============================================================== out Filename or io.BytesIO kind "pdf" scale integer or float compresslevel Default: 9. Integer indicating the compression level. 1 is fastest and produces the least compression, 9 is slowest and produces the most. 0 is no compression. ============= ============================================================== **Text (TXT)** Does not support the "scale" keyword! ============= ============================================================== Name Description ============= ============================================================== out Filename or io.StringIO kind "txt" color Default: "1" background Default: "0" ============= ============================================================== **ANSI escape code** Supports the "border" keyword, only! ============= ============================================================== Name Description ============= ============================================================== kind "ans" ============= ============================================================== **Portable Bitmap (PBM)** ============= ============================================================== Name Description ============= ============================================================== out Filename or io.BytesIO kind "pbm" scale integer plain Default: False. Boolean to switch between the P4 and P1 format. If set to ``True``, the (outdated) P1 serialization format is used. ============= ============================================================== **Portable Arbitrary Map (PAM)** ============= ============================================================== Name Description ============= ============================================================== out Filename or io.BytesIO kind "pam" scale integer color Default: "#000" (black). background Default value ``#fff`` (white). Use ``None`` for a transparent background. ============= ============================================================== **LaTeX / PGF/TikZ** To use the output of this serializer, the ``PGF/TikZ`` (and optionally ``hyperref``) package is required in the LaTeX environment. The serializer itself does not depend on any external packages. ============= ============================================================== Name Description ============= ============================================================== out Filename or io.StringIO kind "tex" scale integer or float color LaTeX color name (default: "black"). The color is written "at it is", so ensure that the color is a standard color or it has been defined in the enclosing LaTeX document. url Default: ``None``. Optional URL where the QR Code should point to. Requires the ``hyperref`` package in your LaTeX environment. ============= ============================================================== **X BitMap (XBM)** ============= ============================================================== Name Description ============= ============================================================== out Filename or io.StringIO kind "xbm" scale integer name Name of the variable (default: "img") ============= ============================================================== **X PixMap (XPM)** ============= ============================================================== Name Description ============= ============================================================== out Filename or io.StringIO kind "xpm" scale integer color Default: "#000" (black). background Default value ``#fff`` (white) ``None`` indicates a transparent background. name Name of the variable (default: "img") ============= ============================================================== :param out: A filename or a writable file-like object with a ``name`` attribute. Use the `kind` parameter if `out` is a :py:class:`io.ByteIO` or :py:class:`io.StringIO` stream which don't have a ``name`` attribute. :param kind: If the desired output format cannot be determined from the ``out`` parameter, this parameter can be used to indicate the serialization format (i.e. "svg" to enforce SVG output) :param kw: Any of the supported keywords by the specific serialization method. """

        writers.save(self.matrix, self._version, out, kind, **kw)