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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 _read(self, delta=0, wrap=False, strict=False):
 """Read the value at a relative point in the wikicode. The value is read from :attr:`self._head <_head>` plus the value of *delta* (which can be negative). If *wrap* is ``False``, we will not allow attempts to read from the end of the string if ``self._head + delta`` is negative. If *strict* is ``True``, the route will be failed (with :meth:`_fail_route`) if we try to read from past the end of the string; otherwise, :attr:`self.END <END>` is returned. If we try to read from before the start of the string, :attr:`self.START <START>` is returned. """

        index = self._head + delta
        if index < 0 and (not wrap or abs(index) > len(self._text)):
            return self.START
        try:
            return self._text[index]
        except IndexError:
            if strict:
                self._fail_route()
            return self.END