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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 _init_fld2col_widths(self):
 """Return default column widths for writing an Excel Spreadsheet."""

        # GO info namedtuple fields: NS dcnt level depth GO D1 name
        # GO header namedtuple fields: format_txt hdr_idx
        fld2col_widths = GoSubDagWr.fld2col_widths.copy()
        for fld, wid in self.oprtfmt.default_fld2col_widths.items():
            fld2col_widths[fld] = wid
        for fld in get_hdridx_flds():
            fld2col_widths[fld] = 2
        return fld2col_widths