pdf.py 文件源码

def slice(self, pdf_file_path, page_actions, final_pdf_path):
        """
        Create new pdf from a slice of pages of a PDF
        :param pdf_file_path: path of the source PDF document, from which a new PDF file will be created.
        :param pages_actions: list of tuples, each tuple containing the page number and the clockwise rotation to
        be applied. The page number is non-zero indexed (first is page 1, and so on).
        :return: None. Writes the resulting PDF file into the provided path.
        """
        output = PdfFileWriter()
        with open(pdf_file_path, 'rb') as file_input:
            input = PdfFileReader(file_input, strict=False)

            # Check page actions correspond to valid input PDF pages
            input_num_pages = input.getNumPages()
            actions_page_numbers = zip(*page_actions)[0]
            largest_page_num = max(actions_page_numbers)
            lowest_page_num = min(actions_page_numbers)

            if lowest_page_num < 1:
                raise Exception(u"Invalid page numbers range in actions: page numbers cannot be lower than 1.")

            if (largest_page_num - 1) > input_num_pages:
                raise Exception(u"Invalid page numbers range in actions: page numbers cannot exceed the maximum numbers"
                                u"of pages of the source PDF document.")

            # Perform actual slicing + rotation
            for num_page, rotation in page_actions:
                output.addPage(input.getPage(num_page-1).rotateCounterClockwise(rotation) if rotation
                               else input.getPage(num_page-1))
            self._write_to_pdf(output, final_pdf_path)