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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 header_proc(self, inputstring, header="file", initial="initial", use_hash=None, **kwargs):
 """Add the header."""

        pre_header = self.getheader(initial, use_hash=use_hash, polish=False)
        main_header = self.getheader(header, polish=False)
        if self.minify:
            main_header = minify(main_header)
        return pre_header + self.docstring + main_header + inputstring