擅长:python、mysql、java
<p>最好使用<strong><code>empty_value_display</code></strong></p>
<blockquote>
<p><a href="https://docs.djangoproject.com/en/1.10/ref/contrib/admin/#django.contrib.admin.ModelAdmin.empty_value_display" rel="noreferrer">empty_value_display</a> <br/>
This attribute overrides the default display value for record’s fields that are empty (None, empty string, etc.). The default value is - (a dash).</p>
</blockquote>
<pre><code>class AuthorAdmin(admin.ModelAdmin):
list_display = ('sub_title',)
sub_title.empty_value_display = 'Not Available'
</code></pre>
<p>这是给<code>django >= 1.9</code></p>