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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_shiftfile_row(self):
 """ Return the information for a shiftfile for this image to provide compatability with the IRAF-based MultiDrizzle. """

        if self.fit is not None:
            rowstr = '%s    %0.6f  %0.6f    %0.6f     %0.6f   %0.6f  %0.6f\n'%(
                    self.name,self.fit['offset'][0],self.fit['offset'][1],
                    self.fit['rot'],self.fit['scale'][0],
                    self.fit['rms'][0],self.fit['rms'][1])
        else:
            rowstr = None
        return rowstr