为什么我在django（3.1.6）和Python（3.8）中得到django.db.models错误，告诉我没有TextChoices的属性？

非常感谢你的阅读。我已经在我的电脑上运行了，没问题。它正在Windows 10上运行我的VS。但是这个错误不断出现，看起来TextChoices不再可用了

AttributeError:模块“django.db.models”没有属性“TextChoices”

我将它放在PythonyWhere、Python3.8和Django 3.1.6上 我对这一点还不熟悉，所以请原谅我

我的问题是TextChoices，下面是完整的错误：

Traceback (most recent call last):
File "/home/sandorf/project/listings/models.py", line 6, in <module>
class Listings(models.Model):
File "/home/sandorf/project/listings/models.py", line 7, in Listings
class Country(models.TextChoices):
AttributeError: module 'django.db.models' has no attribute 'TextChoices'

您可以这样使用：

from django.db import models
from django.utils.timezone import now
from datetime import datetime
# Create your models here.

 class Listings(models.Model):

    COUNTRIES = (
        ('US', 'United States of America'),
        ('CH', 'China'),
    )

    title = models.CharField(max_length=745)
    country = models.CharField(max_length=50, choices=COUNTRIES, default='US')

    def __str__(self):
        return self.title

---

谢谢你，霍夫曼，第一次尝试就成功了。非常感谢！

from django.db import models
from django.utils.timezone import now
from datetime import datetime
# Create your models here.

 class Listings(models.Model):

    COUNTRIES = (
        ('US', 'United States of America'),
        ('CH', 'China'),
    )

    title = models.CharField(max_length=745)
    country = models.CharField(max_length=50, choices=COUNTRIES, default='US')

    def __str__(self):
        return self.title