如何在if语句中设置变量并返回函数？

2 回答

• 1

  我认为这是因为你的退货声明 . 你不需要在if else部分使用它 .

  return语句会导致函数退出并将值传回其调用者 . 当函数准备好向其调用者返回值时，将使用return语句 .

  请看here

  更改您的代码如下（我们需要删除return correct_captcha）

  def list(request):
      correct_captcha = None
      if request.method == 'POST':
          file = request.FILES.get('file', False)
          ca_mode = request.POST.get('mode', 'word').lower()
          assert ca_mode in ['number', 'word', 'four_number']
          captcha = request.POST.get('captcha')
          ca = Captcha(request)
          if ca.validate(captcha):
              if 'file' in request.FILES:
                  fs = FileSystemStorage()
                  fs.save('(' + datetime.now().strftime('%Y-%m-%d-%H-%M-%S') + 
                          ')' + file.name, file)
                  filesname= str('(' + datetime.now().strftime('%Y-%m-%d-%H-
                          %M-%S') + ')' + file.name)
              else:
                  filesname = ''
              add_obj = enquiry(file=filesname)
              add_obj.save()
              correct_captcha = 0
          else:
              correct_captcha = 1
  
          # edit: return moved inside the if condition
          # avoids local variable referenced before assignment error
          return render(request, 'list.html', {'correct_captcha':correct_captcha})
      return render(request, 'list.html')
  

  回复于 2024-04-28T22:05:25+08:00
• 1

  def list(request):
          correct_captcha = None
          if request.method == 'POST':
              file = request.FILES.get('file', False)
              ca_mode = request.POST.get('mode', 'word').lower()
              assert ca_mode in ['number', 'word', 'four_number']
              captcha = request.POST.get('captcha')
              ca = Captcha(request)
              if ca.validate(captcha):
                  if 'file' in request.FILES:
                      fs = FileSystemStorage()
                      fs.save('(' + datetime.now().strftime('%Y-%m-%d-%H-%M-%S') + 
                              ')' + file.name, file)
                      filesname= str('(' + datetime.now().strftime('%Y-%m-%d-%H-
                              %M-%S') + ')' + file.name)
                  else:
                      filesname = ''
                  add_obj = enquiry(file=filesname)
                  add_obj.save()
                  correct_captcha = 0
                  return render(request, 'list.html', {'correct_captcha':correct_captcha})
              else:
                  correct_captcha = 1
                  return render(request, 'list.html', {'correct_captcha':correct_captcha})
          return render(request, 'list.html')
  

  在django如果你想发送一些 variable 到 template 你不能做 return ，因为你需要发送它作为 dictionary context ，所以在视图中尝试上面的代码

  回复于 2024-04-28T22:05:25+08:00