scan `weread` book to pdf and save offline. 扫面`微信读书`的书籍转换为PDF并保存本地 :Args: - book_url: the url of weread book which aimed to scan 扫描目标书籍的ULR - save_at='.': the path of where to save 保存地址
(self, book_url, save_at='.', binary_threshold=200, quality=100, show_output=True, font_size_index=1)
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