lo que antes no se podia hacer

gistfile1.txt

from reportlab.graphics.barcode.widgets import BarcodeCode128
from reportlab.graphics.shapes import Drawing
from reportlab.graphics import renderPDF
from reportlab.pdfgen.canvas import Canvas
from reportlab.platypus import Paragraph, Frame
from reportlab.lib.units import mm
from reportlab.graphics.barcode import code128
import os,sys
import easygui


def run(rfc_list= ["1111","22222"], pdf_file="barcode.pdf"):
    try:
        os.remove(pdf_file)
    except:
        pass

    c = Canvas(pdf_file)
    c.setFontSize(size="7")
    print  " %s pag para %s rfcs " % (round(len(rfc_list)/114.0,0), len(rfc_list))
    for times in range(0,int(round(len(rfc_list)/114.0,0))):
        for i in range(0,6):
            for j in range(1,20):
                st = code128.Code128()
                if len(rfc_list) >0 :
                    rfc = rfc_list.pop()
                else:
                    c.save()
                    sys.exit()
                st.value = rfc
                pos_x = i*30*mm
                pos_y = j*15*mm
                #print pos_x/mm,pos_y/mm
                st.drawOn(c, x = pos_x, y = pos_y)
                c.drawString(pos_x+10*mm, pos_y+7*mm , rfc )
        c.showPage()
        c.setFontSize(size="7")

        try:
            f = open(pdf_file, "wb")
        except IOError:
            easygui.msgbox("El archivo pdf esta abierto, por lo que no se puede guardar", "Error")
            sys.exit(0)
        c.save()


if __name__=='__main__':
    run()