python 修改 pdf 内容

from PyPDF2 import PdfFileWriter, PdfFileReader

import io

from reportlab.pdfgen import canvas

from reportlab.lib.pagesizes import letter

from reportlab.pdfbase.ttfonts import TTFont

from reportlab.pdfbase import pdfmetrics

pdfmetrics.registerFont(TTFont('SimHei', r'C:\Windows\Fonts\simhei.ttf'))

if __name__ == '__main__':

    packet = io.BytesIO()

    # create a new PDF with Reportlab

    can = canvas.Canvas(packet, pagesize=letter)

    can.setFillColorRGB(0, 0, 0)  # choose your font colour

    can.setFont("SimHei", 3)  # choose your font type and font size

    can.drawString(18, 50, "小明 同学")  # name

    can.drawString(20, 40, "恭喜小明同学在这次数学竞赛中取得第一名，特此奖励！")

    can.drawString(80, 30, "阳光小学一班")

    can.drawString(80, 20, "二O二一年四月二十三号")

    can.save()

    # move to the beginning of the StringIO buffer

    packet.seek(0)

    new_pdf = PdfFileReader(packet)

    # read your existing PDF

    existing_pdf = PdfFileReader(open(r"C:\Users\jalchu\Desktop\test.pdf", "rb"))

    output = PdfFileWriter()

    # add the "watermark" (which is the new pdf) on the existing page

    page = existing_pdf.getPage(0)

    page.mergePage(new_pdf.getPage(0))

    output.addPage(page)

    # finally, write "output" to a real file

    outputStream = open(r"C:\Users\jalchu\Desktop\demo.pdf", "wb")

    output.write(outputStream)

    outputStream.close()

    print('end')