如何在Django模板中初始化变量并增加它？

Question

我正在尝试初始化变量并在for循环中递增它但是我收到以下错误：

无效的块标记：'set'，预期'无空间'

这是我的代码：

<tr{{ row.attr_string|safe }}>
    {% spaceless %}

        {% set counter = 0 %}

        {% for cell in row %}

           {% set counter= counter+1 %}

           {% if counter < 4 %}                 
                {%  include "horizon/common/_data_grid_cell.html" %}           
           {% else %}
                {%  include "horizon/common/_data_table_cell.html" %}
            {% endif %}

        {% endfor %}

    {% endspaceless %}
</tr>

Answer 1

你不需要。 Django已经附带forloop.counter和forloop.counter0。您可以直接使用它：

<tr{{ row.attr_string|safe }}>
    {% spaceless %}

        {% for cell in row %}

           {% if forloop.counter < 4 %}                 
                {%  include "horizon/common/_data_grid_cell.html" %}           
           {% else %}
                {%  include "horizon/common/_data_table_cell.html" %}
           {% endif %}

        {% endfor %}

    {% endspaceless %}
</tr>