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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 save(self, filelike):
 """Save the file as a PDF. Parameters filelike: path or file-like object The filename or file-like object to save the labels under. Any existing contents will be overwritten. """

        # Shade any remaining missing labels if desired.
        self._shade_remaining_missing()

        # Create a canvas.
        canvas = Canvas(filelike, pagesize=self._pagesize)

        # Render each created page onto the canvas.
        for page in self._pages:
            renderPDF.draw(page, canvas, 0, 0)
            canvas.showPage()

        # Done.
        canvas.save()