Python for Network Engineers (Part-1)- Variable Declaration

 

Variable Declaration 

Rules for Variable Names:

======================

1. A variable can have a short name (like x and y) or a more descriptive name (cisco, server_names). Rules for Python variables: 

2. A variable name must start with a letter or the underscore character. A variable name cannot start with a number

4. A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _ )

5. Variable names are case-sensitive (cisco, Cisco and CIsco are three different variables)

PS C:\Users\Trainer_PC> python

Python 3.8.2 (tags/v3.8.2:7b3ab59, Feb 25 2020, 23:03:10) [MSC v.1916 64 bit (AMD64)] on win32

Type "help", "copyright", "credits" or "license" for more information.

>>>

>>> Cisco = "CCNA"

>>> Cisco

'CCNA'

>>> Cisco = "CCNA->CCNP>CCIE"

>>> Cisco

'CCNA->CCNP>CCIE'

>>> Juniper = "JNCIA-JUNOS,JNCIS-SEC,JNCIP-SEC,JNCIE-SEC"

>>> juniper

Traceback (most recent call last):

  File "<stdin>", line 1, in <module>

NameError: name 'juniper' is not defined

>>> Juniper

'JNCIA-JUNOS,JNCIS-SEC,JNCIP-SEC,JNCIE-SEC'

>>> cisco, juniper = "CCNA","JNCIA"

>>> cisco

'CCNA'

>>> juniper

'JNCIA'

>>>

>>> cisco=juniper=mikrotik="Routing & Switching"

>>> cisco

'Routing & Switching'

>>> Juniper

'JNCIA-JUNOS,JNCIS-SEC,JNCIP-SEC,JNCIE-SEC'

>>> juniper

'Routing & Switching'

>>> mikrotik

'Routing & Switching'

>>>

>>> print (Pyhton for Network Engineers)

  File "<stdin>", line 1

    print (Pyhton for Network Engineers)

                              ^

SyntaxError: invalid syntax

>>> print ("Pyhton for Network Engineers")

Pyhton for Network Engineers

>>>

>>> print ('Pyhton for Network Engineers')

Pyhton for Network Engineers

>>>

>>> print ('juniper')

juniper

>>> print (juniper)

Routing & Switching

>>>