You can't. The simple way is to preprocess you data in a zipped list, like this
In your view
x = [1, 2, 3]
y = [4, 5, 6]
zipped = zip(x, y)
Then in you template :
{% for x, y in zipped %}
{{ x }} - {{ y }}
{% endfor %}
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…