Python Jinja2 Template: YAML File Cisco Example Tutorial

原文链接：http://networkbit.ch/python-jinja-template/

template.txt如下：

hostname {{ name }}

interface Loopback1
ip address 10.1..{{ id }} 255.255.255.255

{% for vlan, name in vlans.items() %}
vlan {{ vlan }}
 name {{ name }}
{% endfor -%}

router bgp {{ id }}
{% for neighbor in bgp %}
 neighbor {{ neighbor.neighbor }} remote-as {{ neighbor.remote-as }}
{% endfor %}

data.yml 如下：

name: R1
id:
vlans:
 : User
 : Voice
 : Video
bgp:
 - neighbor: 10.1.1.1
   remote-as:
 - neighbor: 10.1.2.2
   remote-as:
 - neighbor: 10.1.3.3
   remote-as: 

Create Python script：

#Imports from Jinja2
from jinja2 import Environment, FileSystemLoader

#Import YAML from PyYAML
import yaml

#Load data from YAML file into Python dictionary
config = yaml.load(open('./data.yml'))

#Load Jinja2 template
env = Environment(loader = FileSystemLoader('./'), trim_blocks=True, lstrip_blocks=True)
template = env.get_template('template.txt')

#Render template using data and print the output
print(template.render(config))