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Mastering Python Networking

You're reading from   Mastering Python Networking Your one stop solution to using Python for network automation, DevOps, and SDN

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Product type Paperback
Published in Jun 2017
Publisher Packt
ISBN-13 9781784397005
Length 446 pages
Edition 1st Edition
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Author (1):
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Eric Chou Eric Chou
Author Profile Icon Eric Chou
Eric Chou
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Toc

Table of Contents (14) Chapters Close

Preface 1. Review of TCP/IP Protocol Suite and Python Language 2. Low-Level Network Device Interactions FREE CHAPTER 3. API and Intent-Driven Networking 4. The Python Automation Framework - Ansible Basics 5. The Python Automation Framework - Ansible Advance Topics 6. Network Security with Python 7. Network Monitoring with Python - Part 1 8. Network Monitoring with Python - Part 2 9. Building Network Web Services with Python 10. OpenFlow Basics 11. Advanced OpenFlow Topics 12. OpenStack, OpenDaylight, and NFV 13. Hybrid SDN

Ansible loops


Ansible provides a number of loops in the playbook, such as standard loops, looping over files, subelements, do-until, and many more. In this section, we will look at two of the most commonly used loop forms, standard loops, and looping over hash values.

Standard loops

Standard loops in playbook are often used to easily perform similar tasks multiple times. The syntax for standard loops is very easy; the variable {{ item }} is the placeholder looping over the with_items list. For example, take a look at the following:

      tasks:
        - name: echo loop items
          command: echo {{ item }}
          with_items: ['r1', 'r2', 'r3', 'r4', 'r5']   

It will loop over the five list items with the same echo command:

TASK [echo loop items] *********************************************************
changed: [192.168.199.185] => (item=r1)
changed: [192.168.199.185] => (item=r2)
changed: [192.168.199.185] => (item=r3)
changed: [192.168.199.185] => (item=r4)
changed: [192...
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