Django - 语法错误

Question

我正在从djangobook学习Django,在第6章中安装了admin应用程序,该syncdb命令返回语法错误models.py(return u'%s %s' % (self.first_name, self.last_name)

我正在使用Python 3.

为什么会这样？怎么解决？

models.py:

from django.db import models

class Publisher (models.Model):
    name = models.CharField(max_length=30)
    address = models.CharField(max_length=50)
    city = models.CharField(max_length=60)
    state_province = models.CharField(max_length=30)
    country = models.CharField(max_length=50)
    website=models.URLField()

    def __unicode__(self):
        return self.name

class Author(models.Model):
    first_name = models.CharField(max_length=30)
    last_name = models.CharField(max_length=40)
    email = models.EmailField()

    def __unicode__(self):
        return u'%s %s' % (self.first_name, self.last_name)

class Book(models.Model):
    title = models.CharField(max_length=100)
    authors = models.ManyToManyField(Author)
    publisher = models.ForeignKey(Publisher)
    publication_date = models.DateField()

    def __unicode__(self):
        return self.title

错误:

  File "C:\Users\karthikeyan\Desktop\NightHawk\Hawk\books\models.py", line 20
    return u'%s %s' % (self.first_name, self.last_name)
                  ^
SyntaxError: invalid syntax

Answer 1

您在Python 3中使用Python 2语法.虽然Python 3.3及更高版本支持使用uunicode字符串值的前缀(以支持跨版本代码),但Python 3.2及之前没有 ; 删除u前缀以使其工作:

def __unicode__(self):
    return '%s %s' % (self.first_name, self.last_name)

但是,您还需要查阅Django 移植到Python 3文档并使用__str__,而不是__unicode__在这里:

def __str__(self):
    return '%s %s' % (self.first_name, self.last_name)

如果您正在阅读特定的书籍,则可能需要安装Python 2.