reportlab 生成pdf

# -*- coding=utf-8 -*-
import sys
reload(sys)
sys.setdefaultencoding('utf8')
from reportlab.lib import colors
from reportlab.lib.pagesizes import A4
from reportlab.platypus import Table, TableStyle
from reportlab.pdfbase import pdfmetrics
from reportlab.pdfbase.ttfonts import TTFont
from reportlab.platypus import SimpleDocTemplate
from reportlab.pdfgen import canvas


class FooterCanvas(canvas.Canvas):

    def __init__(self, *args, **kwargs):
        canvas.Canvas.__init__(self, *args, **kwargs)
        self.pages = []

    def showPage(self):
        self.pages.append(dict(self.__dict__))
        self._startPage()

    def save(self):
        page_count = len(self.pages)
        for page in </