本文介绍了jinja2 嵌套变量的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着跟版网的小编来一起学习吧！
问题描述
I am currently learning jinja2 and i am unsure on how to address variables the correct way:
Here are my variables in yaml:
---
hosts:
app201.acme.com: {eth0: {ip: 46.0.0.1, netmask: 255.255.255.255}}
graphite.acme.com: {eth0: {ip: 46.0.0.2, netmask: 255.255.255.255},
eth0.1: {ip: 10.2.90.1, netmask: 255.255.255.255}}
and here the jinja2 template:
{{ fqdn }}
{% for interface in hosts[fqdn] %}
{{ interface }}
{{ hosts[fqdn].interface.ip }} << doesn't work
{{ hosts[fqdn].{{ interface }}.ip }} << doesn't work
{{ interface.ip }} << doesn't work
{% endfor %}
so currently my output looks like this since I can't access second dimension of yaml hash.
graphite.acme.com eth0.1
eth0
解决方案
The variable hosts is a dict. The correct way to access values in dict is to use [] operator.
{{ fqdn }}
{% for interface in hosts[fqdn] %}
{{ interface }}
{{ hosts[fqdn][interface]['ip'] }}
{% endfor %}
. operator is used to access attribute of an object.
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