January 2023
Intermediate to advanced
458 pages
14h 16m
Chinese
Content preview from 可编程网络自动化
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146
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第
6
章
注意，这里向模板对象的
render()
方法传入了一个参数。要特别注意参数名称：
interface
对应于
Jinja
模板中的
interface
。模板引擎正是这样得到
interface
字典的——当模板引
擎看到有
interface
或其键的引用时，就会使用传入的字典来解析引用。
如你所见，渲染后的输出在我们的意料之中。但是，并不是非要使用
Python
字典
。使用其
他
Python
库来驱动数据进入
Jinja
模板中也是很常见的做法，这可能要用到
Python
类。
下面的
Python
脚本类似于前面刚介绍的那个例子，只不过使用
Python
类代替了字典。
from jinja2 import
Environment, FileSystemLoader
ENV = Environment(loader=FileSystemLoader('.'))
template = ENV.get_template("template.j2")
class NetworkInterface
(object):
def __init__
(self, name, description, vlan, uplink=False):
self.name = name
self.description = description
self.vlan = vlan
self.uplink = uplink
interface_obj = NetworkInterface("GigabitEthernet0/1", ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.