This Python course focusses on teaching Python for use in network automation and network DevOps.
We focus on getting delegates up and running with Python and network automation as quickly as possible rather than making them great programmers. In other words we concentrate on enabling delegates to use network automation libraries such as netmiko and NAPALM and APIs such as NETCONF rather than enabling delegates to produce object oriented programs.
Hands on sessions use Cisco and Juniper devices.
TCP/IP foundation for engineers
By the end of the course delegates will be able to:
What is Python?
Programming languages, Why Python? Python in interactive mode, Python scripts, ipython, Python version 2 versus version 3. A simple Python script. Comments.
Installing Python, Hello world.
A network example
On box vs off box Python. telnet, ssh, NETCONF, HTTP, APIs, manufacturers and API support, analysis of a simple telnetlib program.
Using Python to retrieve the configuration from a network device. Using wireshark to analyse the actions.
Python basics
I/O operators, variables and assignment, types, indentation, loops and conditionals.
Modifying the telnet program, changing configurations on a network devices.
Functions, classes and methods
What are functions, calling functions, builtin functions, useful builtin functions, file handling, classes, objects, creating instances.
Storing configurations in files, configuring devices from files, using an inventory file to work on multiple devices.
Libraries and modules
Modules, files and packages, import, from-import, Python standard library, other packages, pip install, executing other programs. Managing python libraries.
Using pip, installing and using ipaddress, subprocess to access netsnmp. For the more advanced, using the sockets library.
Paramiko and netmiko
SSH, enabling SSH on devices, keys. Paramiko versus netmiko, example scripts. pexpect. Hands on Configuring VLANs from Python.
pySNMP
Gathering facts using previous methods, SNMP review, pySNMP GET, pySNMP and SNMPv3. easySNMP library.
Walking a MIB from Python.
NETCONF
What is NETCONF? Enabling NETCONF on devices, A first ncclient script, device handlers, get_config, edit_config, copy_config, delete_config, commit, validate, pyEZ, utils_config, utils.sw.
Configuration using ncclient and PyEZ. This session is expanded for those interesting in JunOS automation.
Manipulating configuration files
Builtin functions, string handling. Unicode. Sequences, strings, lists, tuples. Dictionaries. TextFSM. Regular expressions. JSON, YAML, XML, YANG, Jinja2, templates. Hands on Jinja2 templating with Python to configure network devices.
NAPALM
Getters, configuration operations, supported devices, NAPALM transport, Config-replace, Config-merge, Compare config, Atomic changes, rollback. Example NAPLAM scripts. Hands on Using NAPALM to gather facts, Using NAPALM for configuration management
REST and RESTCONF
What is REST, HTTP methods, GET, POST, cURL, Postman, Python requests library. RESTCONF, a RESTCONF example.
Modifying a configuration using RESTCONF.
Scapy
What is scapy, Scapy in interactive mode, Scapy as a module.
Packet crafting from Python.
Warning
Errors and exceptions, Exception handling, try, except. Memory management. Garbage collection. Context management, With.
Improving Python code.
Optional
Writing your own functions, Writing your own classes. pyntc.
Writing reusable code.
Join our public courses in our Switzerland facilities. Private class trainings will be organized at the location of your preference, according to your schedule.