django forms中widget属性的自定义

如有model：

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



在django下可以用以下方式生成forms

代码:
from django.forms import ModelForm
class BookForm(ModelForm):
    class Meta:
        model = Book



这时由生成html中title input中没有size属性，是默认大小，如果自定义大小可以如下：

代码:
from django.forms import ModelForm
class BookForm(ModelForm):
    class Meta:
        model = Book
    title=forms.CharField(label=u'标题', widget=forms.TextInput(attrs={'size':'40'}))

from http://www.okpython.com/bbs/thread-3294-1-2.html