使用 python 往已有内容的 PDF 文件写入数据

只使用reportlab库好像没法在已经有内容的 PDF 页面中写入数据，只能生成一个空的 PDF 文件再写入。所以这里我是配合pdfrw库来实现的。具体见示例

from reportlab.pdfgen.canvas import Canvas
from pdfrw import PdfReader
from pdfrw.buildxobj import pagexobj
from pdfrw.toreportlab import makerl
from reportlab.pdfbase.ttfonts import TTFont
from reportlab.pdfbase.pdfmetrics import registerFont


def pdf_write(input_file, output_file=None):

    text_dic = [
        ["ABCDEFG HIJKLMN", 90, 757, 12],
        ["123456789123456789", 90, 738, 10]
    ]

    if not output_file:
        output_file = f'{os.path.splitext(input_file)[0]}_new.pdf'
    registerFont(TTFont('yh', 'msyh.ttf'))  # 设置文字字体

    template = PdfReader(input_file)
    canvas = Canvas(output_file)

    template_obj0 = pagexobj(template.pages[0])
    obj0_name = makerl(canvas, template_obj0)
    canvas.doForm(obj0_name)

    for value in text_dic:
        canvas.setFont("yh", value[3])  # 设置字号
        canvas.drawString(value[1], value[2], value[0])

    canvas.showPage()  # 关闭当前页，开始新页
    template_obj1 = pagexobj(template.pages[1])
    obj1_name = makerl(canvas, template_obj1)
    canvas.doForm(obj1_name)

    canvas.save()

效果：

写入前

写入后