使用ReportLab显示页数

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

def add_page_number(canvas, doc):
    # 获取当前页码
    page_num = canvas.getPageNumber()
    # 在页脚位置绘制页码
    canvas.drawRightString(200, 30, "Page %d" % page_num)

def generate_pdf():
    doc = SimpleDocTemplate("output.pdf", pagesize=letter)

    # 创建一个样式表
    styles = getSampleStyleSheet()

    # 创建一个页脚模板
    footer_template = PageTemplate(id='footer', frames=[Frame(50, 50, 500, 50, id='footer_frame', showBoundary=0)])

    # 将页码绘制函数添加到页脚模板中
    footer_template.beforeDrawPage = add_page_number

    # 将页脚模板添加到文档中
    doc.addPageTemplates([footer_template])

    # 创建一个段落对象
    paragraphs = [Paragraph("This is page 1", styles['Normal']), Paragraph("This is page 2", styles['Normal'])]

    # 将段落对象添加到文档中
    doc.build(paragraphs)

generate_pdf()