temp_code/python/demo_svg_pdf/test_svg_background_image

import os
import io
import tempfile
import json
from PyPDF2 import PdfFileWriter, PdfFileReader
import svgwrite
import cairosvg
import xml.etree.ElementTree as ET
from PIL import Image
import zipfile

class XML2SVG(svgwrite.container.SVG):
    def __init__(self, xml, insert=None, size=None, **extra):
        self.xml = xml

        super().__init__(**extra)

    def get_xml(self):
        xml = self.xml

        for attribute, value in sorted(self.attribs.items()):
            # filter 'None' values
            if value is not None:
                value = self.value_to_string(value)
                if value:  # just add not empty attributes
                    xml.set(attribute, value)

        for element in self.elements:
            xml.append(element.get_xml())
        return xml

def image2byte(image):
    '''
    图片转byte
    image: 必须是PIL格式
    image_bytes: 二进制
    '''
    # 创建一个字节流管道
    img_bytes = io.BytesIO()
    # 将图片数据存入字节流管道， format可以按照具体文件的格式填写
    image.save(img_bytes, format="PNG")
    # 从字节流管道中获取二进制
    image_bytes = img_bytes.getvalue()
    return image_bytes

_zipfile = zipfile.ZipFile(os.getcwd(), 'w')

svg_page = None
unit = svgwrite.Unit("mm")

pdf_writer = PdfFileWriter()
report_fd, report_path = tempfile.mkstemp(suffix='.pdf')
os.close(report_fd)

image = Image.open("background_image.png")
byte_data = image2byte(image)

print(type(byte_data))

svg_page = svgwrite.Drawing(size=(unit(297), unit(210)))

image = svg_page.image("data:image/png;base64,{0}".format(str(byte_data)), (unit(5), unit(30)), (unit(95), unit(170)))

svg_page.add(image)

pdf_writer.addPage(PdfFileReader(io.BytesIO(cairosvg.svg2pdf(bytestring=svg_page.tostring()))).getPage(0))

with open(report_path, 'ab') as out:
    pdf_writer.write(out)
    _zipfile.write(report_path, '%s - %s.pdf' % ('test_pdf', datetime.now().strftime("%Y-%m-%d")))