AttributeError:"NoneType"对象没有属性"app" [英] AttributeError: 'NoneType' object has no attribute 'app'

问题描述

下面的代码给出了错误:

The below code gives error:

Traceback (most recent call last):
  File "pdf.py", line 14, in <module>
    create_pdf(render_template('templates.htm'))
  File "/usr/local/lib/python2.7/dist-packages/flask/templating.py", line 123, in render_template
    ctx.app.update_template_context(context)
AttributeError: 'NoneType' object has no attribute 'app'

代码:

from xhtml2pdf import pisa
from StringIO import StringIO
from flask import render_template,Flask

app=Flask(__name__)
app.debug=True

@app.route("/")
def create_pdf(pdf_data):
        filename= "file.pdf"
        pdf=pisa.CreatePDF( StringIO(pdf_data),file(filename, "wb"))

if __name__ == "__main__":
        create_pdf(render_template('templates.htm'))

推荐答案

从代码中，我可以看到您希望允许用户下载pdf.

From the code, I can see that you want to allow user to download pdf.

from xhtml2pdf import pisa
from StringIO import StringIO
from flask import render_template,Flask, Response

app=Flask(__name__)
app.debug=True

@app.route("/")
def create_pdf(pdf_data):
        filename= "file.pdf"
        pdf=pisa.CreatePDF( StringIO(pdf_data),file(filename, "wb"))
        return Response(pdf, mimetype='application/octet-stream',
                        headers={"Content-Disposition": "attachment;filename=%s" % filename})

if __name__ == "__main__":
        app.run()

现在，运行python aboveprogram.py

转到http://localhost:5000

浏览器提示下载PDF.

Browser prompts to download PDF.

这篇关于AttributeError:"NoneType"对象没有属性"app"的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！