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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 as_fs(self):
 """ Returns the value of component encoded as formatted string. Inspect each character in value of component. Certain nonalpha characters pass thru without escaping into the result, but most retain escaping. :returns: Formatted string associated with component :rtype: string """


        s = self._standard_value
        result = []
        idx = 0
        while (idx < len(s)):

            c = s[idx]  # get the idx'th character of s
            if c != "\\":
                # unquoted characters pass thru unharmed
                result.append(c)
            else:
                # Escaped characters are examined
                nextchr = s[idx + 1]

                if (nextchr == ".") or (nextchr == "-") or (nextchr == "_"):
                    # the period, hyphen and underscore pass unharmed
                    result.append(nextchr)
                    idx += 1
                else:
                    # all others retain escaping
                    result.append("\\")
                    result.append(nextchr)
                    idx += 2
                    continue
            idx += 1

        return "".join(result)