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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 _load(self, keyframe=True):
 """Read all remaining pages from file."""

        if self._cached:
            return
        pages = self.pages
        if not pages:
            return
        if not self._indexed:
            self._seek(-1)
        if not self._cache:
            return
        fh = self.parent.filehandle
        if keyframe is not None:
            keyframe = self._keyframe
        for i, page in enumerate(pages):
            if isinstance(page, inttypes):
                fh.seek(page)
                page = self._tiffpage(self.parent, index=i, keyframe=keyframe)
                pages[i] = page
        self._cached = True