Introduction to Junos Platform Automation and Devops

Module 06: Python Fundamentals

Basics

• Versions (Python 2 vs Python 3)
• Python Virtual Machine
• Control flow
• Indentation
• Built in types
  • List
  • Set
  • Dictionary
• Python modules (PyPi, Python Package Index)
• pip, pip3

Executing Python Scripts

Junos PyEZ (jnpr.junos) provides similar capabilities to the Junos CLI.

This script uses PyEZ to upgrade the firmware on a remote device.

from jnpr.junos import Device
from jnpr.junos.utils.scp import SCP

dev = Device('172.25.11.1')
with SCP(dev, progress=True) as scp:
    scp.put('/home/lab/jinstall-ppc-20.2R2.11-signed.tgz', remote_path='/var/tmp')

Verify that the software image was copied

from jnpr.junos.utils.start_shell import StartShell

dev = Device('172.25.11.1')
ss = StartShell(dev)
softwareimage = ss.run("ls -al /var/tmp/jinstall*")
print(softwareimage[1])
ss.close()

Lab

from jnpr.junos import Device
from pprint import print

dev = Device('172.25.11.1')
dev.open()
pprint(dev.facts)
dev.close();


from jnpr.junos import Device
from jnpr.junos.utils.start_shell import StartShell

dev = Device('172.25.11.1')
ss = StartShell(dev)
command = ss.run('cli -c "show system uptime"')
print(command[1])
ss.close()