我在 django 中不断收到以下错误："UnboundLocalError at /myapp/"

Question

我在 django 中遇到这个错误 python:

"UnboundLocalError at /myapp/" 赋值前引用的局部变量'album'

我在 models.py 文件中创建了一个 class 并在视图中导入但遇到此错误

这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

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 2

将标题移到循环内并更好地使用与模型不同的循环变量名称

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 3

您正在为多个变量使用 album 名称，一次作为模型，其他时候作为实例。理想情况下，型号名称应采用 CamelCased。更正模型名称后，将 title 变量赋值移动到 for 循环内。只有后者才能暂时解决您的问题，但如果您坚持样式指南 (PEP-8)，您以后就不会遇到此类问题。

models.py

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

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："UnboundLocalError at /myapp/"

I keep getting the following error in django: "UnboundLocalError at /myapp/"

python

django

local-variables