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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在网络场景中学习
Python
｜
93
如果使用先前例子中出现过的变量
vendors
，该如何检查其是否包含特定的厂商？一种做
法是遍历整个列表，逐个比对。这肯定没问题，但为什么不用
in
呢？
使用容纳不仅可读性好，还能简化查找过程。
>>> vendors = ['arista', 'juniper', 'big_switch', 'cisco']
>>>
>>> 'arista'
in
vendors
True
>>>
可以看出，语法相当直观，返回的是一个布尔值。值得一提的是，这也是另一种惯用的
Python
代码写法。
现在可以更进一步，加入条件语句。
>>>
if
'arista'
in
vendors:
...
print
('Arista is deployed.')
...
'Arista is deployed.'
>>>
接下来的例子会检查一个字符串的一部分是否在另一个字符串中，其中展示了一个基本的
布尔表达式，然后在条件语句中运用了该表达式。
>>> version = "CSR1000V Software (X86_64_LINUX_IOSD-UNIVERSALK9-M),
Version 16.3.1, RELEASE"
>>>
>>> "16.3.1"
in
version
True
>>>
>>>
if
"16.3.1"
in
version:
...
print
("Version is 16.3.1!!")
...
Version
is
16.3.1!!
>>>
>>>
如前所述，当与条件语句配合使用时，容纳可以简单高效地判断一个对象是否包含另一个 ...
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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.