Question

Passing csv contents to template. And getting error. thanks

  def ....
    with open('csv', 'rb') as f:
      reader = csv.reader(f)
    return render(request, template, {"results": reader})

Error

I/O operation on closed file

Full Traceback

Answer 1

with introduces a new context manager, which in the case of a file takes care of closing its argument after it ends. However, your context manager ends in the very next line, so by the time the render function is called, the file is closed, and the csv reader can’t operate.

You could probably just move the return one indentation to the right, or better call render within the with but save it to a variable which you subsequently pass to return:

with open('csv', 'rb') as f:
    reader = csv.reader(f)
    html = render(request, template, {"results": reader})
return html