Get paragraph delta/weight in template
I'm not sure what template you're using, and I'm not sure how your site is setup. But if you have a template that is looping through and displaying these paragraphs, you can add a check in your twig file that checks if the paragraph is even or odd. 

{% for paragraph in paragraphs %}
    {% if loop.index is divisibleby(2) %}
        &lt;div class='text-container'&gt;{{ paragraph.field_text }}&lt;/div&gt;
        &lt;div class='image-container'&gt;{{ paragraph.field_image }}&lt;/div&gt;
    {% else %}
        &lt;div class='image-container'&gt;{{ paragraph.field_image }}&lt;/div&gt;
        &lt;div class='text-container'&gt;{{ paragraph.field_text }}&lt;/div&gt;
    {% endif %}
{% endfor %}