long_line = '''
xhtml2pdf is a html2pdf converter using the ReportLab Toolkit, the HTML5lib and pyPdf. It supports HTML 5 and CSS 2.1 (and some of CSS 3). It is completely written in pure Python so it is platform independent.
'''
can.drawString(0, 700, long_line)
字符串太长,无法全部显示在pdf页面中,如何自动换行?