How to use the pygmt.helpers.kwargs_to_strings function in pygmt

    @kwargs_to_strings()
    def psconvert(self, **kwargs):
        """
        Convert [E]PS file(s) to other formats.

        Converts one or more PostScript files to other formats (BMP, EPS, JPEG,
        PDF, PNG, PPM, SVG, TIFF) using GhostScript.

        If no input files are given, will convert the current active figure
        (see :func:`pygmt.figure`). In this case, an output name must be given
        using parameter *F*.

        Full option list at :gmt-docs:`psconvert.html`

        {aliases}

        Parameters

    @kwargs_to_strings(R="sequence", i="sequence_comma")
    def plot(self, x=None, y=None, data=None, sizes=None, direction=None, **kwargs):
        """
        Plot lines, polygons, and symbols on maps.

        Used to be psxy.

        Takes a matrix, (x,y) pairs, or a file name as input and plots lines,
        polygons, or symbols at those locations on a map.

        Must provide either *data* or *x* and *y*.

        If providing data through *x* and *y*, *color* (G) can be a 1d array
        that will be mapped to a colormap.

        If a symbol is selected and no symbol size given, then psxy will
        interpret the third column of the input data as symbol size. Symbols

    @kwargs_to_strings(R="sequence", i="sequence_comma")
    def contour(self, x=None, y=None, z=None, data=None, **kwargs):
        """
        Contour table data by direct triangulation.

        Takes a matrix, (x,y,z) pairs, or a file name as input and plots lines,
        polygons, or symbols at those locations on a map.

        Must provide either *data* or *x*, *y*, and *z*.

        [TODO: Insert more documentation]

        Full option list at :gmt-docs:`contour.html`

        {aliases}

        Parameters

    @kwargs_to_strings(R="sequence")
    def basemap(self, **kwargs):
        """
        Produce a basemap for the figure.

        Several map projections are available, and the user may specify
        separate tick-mark intervals for boundary annotation, ticking, and
        [optionally] gridlines. A simple map scale or directional rose may also
        be plotted.

        At least one of the options *B*, *L*, or *T* must be specified.

        Full option list at :gmt-docs:`basemap.html`

        {aliases}

        Parameters

    @kwargs_to_strings(R="sequence")
    def grdimage(self, grid, **kwargs):
        """
        Project grids or images and plot them on maps.

        Takes a grid file name or an xarray.DataArray object as input.

        Full option list at :gmt-docs:`grdimage.html`

        {aliases}

        Parameters
        ----------
        grid : str or xarray.DataArray
            The file name of the input grid or the grid loaded as a DataArray.

        """

    @kwargs_to_strings(R="sequence")
    def coast(self, **kwargs):
        """
        Plot continents, shorelines, rivers, and borders on maps

        Plots grayshaded, colored, or textured land-masses [or water-masses] on
        maps and [optionally] draws coastlines, rivers, and political
        boundaries.  Alternatively, it can (1) issue clip paths that will
        contain all land or all water areas, or (2) dump the data to an ASCII
        table. The data files come in 5 different resolutions: (**f**)ull,
        (**h**)igh, (**i**)ntermediate, (**l**)ow, and (**c**)rude. The full
        resolution files amount to more than 55 Mb of data and provide great
        detail; for maps of larger geographical extent it is more economical to
        use one of the other resolutions. If the user selects to paint the
        land-areas and does not specify fill of water-areas then the latter
        will be transparent (i.e., earlier graphics drawn in those areas will
        not be overwritten).  Likewise, if the water-areas are painted and no

    @kwargs_to_strings(R="sequence")
    def logo(self, **kwargs):
        """
        Place the GMT graphics logo on a map.

        By default, the GMT logo is 2 inches wide and 1 inch high and
        will be positioned relative to the current plot origin.
        Use various options to change this and to place a transparent or
        opaque rectangular map panel behind the GMT logo.

        Full option list at :gmt-docs:`logo.html`

        {aliases}

        Parameters
        ----------
        {J}

    @kwargs_to_strings(R="sequence", G="sequence")
    def colorbar(self, **kwargs):
        """
        Plot a gray or color scale-bar on maps.

        Both horizontal and vertical scales are supported. For CPTs with
        gradational colors (i.e., the lower and upper boundary of an interval
        have different colors) we will interpolate to give a continuous scale.
        Variations in intensity due to shading/illumination may be displayed by
        setting the option -I. Colors may be spaced according to a linear
        scale, all be equal size, or by providing a file with individual tile
        widths.

        Full option list at :gmt-docs:`colorbar.html`

        {aliases}

    @kwargs_to_strings(R="sequence", L="sequence", A="sequence_plus")
    def grdcontour(self, grid, **kwargs):
        """
        Convert grids or images to contours and plot them on maps

        Takes a grid file name or an xarray.DataArray object as input.

        Full option list at :gmt-docs:`grdcontour.html`

        {aliases}

        Parameters
        ----------
        grid : str or xarray.DataArray
            The file name of the input grid or the grid loaded as a DataArray.
        C : str or int
            Specify the contour lines to generate.

    @kwargs_to_strings(R="sequence")
    def image(self, imagefile, **kwargs):
        """
        Place images or EPS files on maps.

        Reads an Encapsulated PostScript file or a raster image file and plots
        it on a map.

        Full option list at :gmt-docs:`image.html`

        {aliases}

        Parameters
        ----------
        {J}
        {R}
        D: str