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__init__ (
        self,
        filename,
        **keyw,
        )
Represent a PlotItem that gnuplot treates as a file.        This class holds the information that is needed to construct
        the plot command line, including options that are specific to
        file-like gnuplot input.         <filename> is a string representing the filename to be passed
        to gnuplot within quotes.  It may be the name of an existing
        file, -for inline data, or the name of a named pipe.         Keyword arguments:
            using=<int>plot that column against line number            using=<tuple>plot using a:b:c:d etc.  Elements in
                the tuple that are None are output as the empty
                string.            using=<string>plot `using <string>' (allows gnuplot's
                arbitrary column arithmetic)            every=<value>plot every <value>.  <value> is
                formatted as forusingoption.            index=<value>plot index <value>.  <value> is
                formatted as forusingoption.            binary=<boolean>data in the file is in binary format
                (this option is only allowed for grid data for splot).            smooth=<string>smooth the data.  Option should be
                unique,csplines,acsplines,bezier, orsbezier.         The keyword arguments recognized by PlotItemcan also be
        used here.         Note that the usingoption is interpreted by gnuplot, so
        columns must be numbered starting with 1.         By default, gnuplot uses the name of the file plus any usingoption as the dataset title.  If you want another title, set
        it explicitly using thetitleoption. |