如果您在创建一个复杂的 PDF 文档（或者任何较大的数据块），请使用 cStringIO 库存放临时生成的 PDF 文件。 cStringIO 提供了一个用 C 编写的类似文件对象的接口，从而可以使系统的效率最高。

from cStringIO import StringIOfrom reportlab.pdfgen import canvasfrom django.http import HttpResponsedef hello_pdf(request):    # Create the HttpResponse object with the appropriate PDF headers.    response = HttpResponse(mimetype='application/pdf')    response['Content-Disposition'] = 'attachment; filename=hello.pdf'    temp = StringIO()    # Create the PDF object, using the StringIO object as its "file."    p = canvas.Canvas(temp)    # Draw things on the PDF. Here's where the PDF generation happens.    # See the ReportLab documentation for the full list of functionality.    p.drawString(100, 100, "Hello world.")    # Close the PDF object cleanly.    p.showPage()    p.save()    # Get the value of the StringIO buffer and write it to the response.    response.write(temp.getvalue())    return response