<pre><code>for instance in GratuityPayment.objects.all():
print instance.date_paid
if (employment_number == instance.employment_number):
raise forms.ValidationError('This Employment Mumber was paid on ' + str(instance.date_paid) + '. You cannot proceed with this retirement')
</code></pre>
<p><strong>打印实例.付款日期</strong>打印存储在数据库中的所有付款日期,但<strong>str(实例.付款日期)</strong>未给出任何值</p>
<p>我把下面这行作为我的输出</p>
<p><strong>这一就业数字没有支付。您不能继续执行此退休操作</strong></p>
<p>如何在if语句中使用<strong>instance.date\u paid</strong></p>