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 10.1.1.{{ 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: 1
vlans:
 11: User
 22: Voice
 33: Video
bgp:
 - neighbor: 10.1.1.1
   remote-as: 1
 - neighbor: 10.1.2.2
   remote-as: 2
 - neighbor: 10.1.3.3
   remote-as: 3

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))