Question

我在django python中面临这个错误：

＆＃34; / myapp /＆＃34的UnboundLocalError; 本地变量＆＃39;专辑＆＃39;在分配前引用

我在models.py文件中创建了一个类并导入视图但面临此错误

以下是两个文件的完整代码：

Models.py

from django.db import models

from django.db import models

class album(models.Model):
    artist = models.CharField(max_length=250)
    title = models.CharField(max_length=500)
    gender = models.CharField(max_length=100)

    def __str__(self):
        return self.artist+'--'+self.title

views.py

from django.http import HttpResponse
from .models import album

def myapp(request):
   all_albums = album.objects.all()
   title = album.artist
   html = ''
   for album in all_albums:
      url = '/myapp/' + str(album.id) + '/'
      html += '<a href="' + url + '">' + title + '</a><br>'
   return HttpResponse(html)

Answer 1

在循环内移动标题并更好地使用循环变量名称而不是模型

html = ''
for album_data in all_albums:
    url = '/myapp/' + str(album_data.id) + '/'
    title = album_data.artist
    html += '<a href="' + url + '">' + title + '</a><br>'
return HttpResponse(html)

Answer 2

像这样改变视图，

def myapp(request):
    all_albums = album.objects.all()
    html = ''
    for album in all_albums:
       url = '/myapp/' + str(album.id) + '/'
       html += '<a href="' + url + '">' + album.artist + '</a><br>'
    return HttpResponse(html)

Answer 3

您使用album名称作为多个变量，一次作为模型，其他时间作为实例。模型名称理想情况下应该是CamelCased。更正模型名称后，在title循环内移动for变量赋值。只做后者会解决你现在的问题，但是如果你坚持造型指南（PEP-8），你将来不会遇到这样的问题。

<强> models.py

...
class Album(models.Model):
    artist = models.CharField(max_length=250)
...

<强> views.py

...
from .models import Album

def myapp(request):
    all_albums = Album.objects.all()
    html = ''
    for album in all_albums:
        title = album.artist
        url = '/myapp/' + str(album.id) + '/'
        html += '<a href="' + url + '">' + title + '</a><br>'
...

Answer 4

完全复制并粘贴到您的视图中

from django.http import HttpResponse
from .models import album

def myapp(request):
   all_albums = album.objects.all()
   html = ''
   for al in all_albums:
      url = '/myapp/' + str(al.id) + '/'
      html += '<a href="' + url + '">' + al.artist + '</a><br>'
   return HttpResponse(html)

我在django中不断收到以下错误：＆＃34; / myapp /＆＃34的UnboundLocalError;

4 个答案: