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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_path(self, dir=None):
 """Return path relative to the current working directory of the Node.FS.Base object that owns us."""

        if not dir:
            dir = self.fs.getcwd()
        if self == dir:
            return '.'
        path_elems = self.get_path_elements()
        pathname = ''
        try: i = path_elems.index(dir)
        except ValueError:
            for p in path_elems[:-1]:
                pathname += p.dirname
        else:
            for p in path_elems[i+1:-1]:
                pathname += p.dirname
        return pathname + path_elems[-1].name