带reportLab的两栏和页脚

from reportlab.lib.pagesizes import letter
from reportlab.lib import colors
from reportlab.platypus import SimpleDocTemplate, PageTemplate, BaseDocTemplate, Frame, Paragraph, Spacer
from reportlab.lib.styles import getSampleStyleSheet

frame1 = Frame(50, 50, 250, 700, showBoundary=1)  # 左栏
frame2 = Frame(300, 50, 500, 700, showBoundary=1)  # 右栏

footer_style = getSampleStyleSheet()["Normal"]
footer_text = "页码：<pageNumber>"

def add_footer(canvas, doc):
    canvas.saveState()
    footer = Paragraph(footer_text, footer_style)
    w, h = footer.wrap(doc.width, doc.bottomMargin)
    footer.drawOn(canvas, doc.leftMargin, h)
    canvas.restoreState()

def generate_pdf(output_filename, content):
    doc = BaseDocTemplate(output_filename, pagesize=letter)
    doc.addPageTemplates([PageTemplate(frames=[frame1, frame2], onPage=add_footer)])
    
    # 添加内容
    flowables = []
    styles = getSampleStyleSheet()
    flowables.append(Paragraph(content, styles["Normal"]))
    
    doc.build(flowables)

generate_pdf("output.pdf", "这是文档内容。")