2. basics of python

Here in this class we will deal with Network
Automation with the help of Python
FOR CLASSES CALL +91-9790901210
www.networkrhinos.com | Vishnu (Founder) | +91-9790901210
Python 3 for Network Engineers

Basics of Python
• Understand a point, Coding is not all about how much you know, its
all about what are the stuffs you can based on how much you know.
• Lets get started quickly. We will have 2 sessions in this course.
• 1st session will introduce the possible commands and explanation
• 2nd session we will jump into Python for Network Engineers

What Python can do
• We can create games, software’s etc
• However we will focus on Python feature that’s helping the network
engineer to make our job easy.

Boolean
comparison
Python
Programming

Overview
• There are 8 comparison operators in python.
• All have same priority.
• They can chained arbitrarily like x<y<=z is equivalent to x<y and y<=z
Operation Meaning
< Strictly less than
<= Less than or equals to
> Strictly greater than
>= Greater than or equals to
== Equals
!= Not equals
Is Object identity
Is not Negated object identity

Comparison operator
You can below commands to check
x=7 # here you are assigning
a value to the variable x
x==5 #comparig if x is equal
to 5
x==6
x==8
x<7
x>8
x<9
x=7
x
7
x<10
True
x<5
False
x==9
False
x==10
False
x>=3
True
x<8
True
x!=7
False
Command
Output
x>3 and x>4
True
x>1 or x>100
True
Using “and” “or”

Boolean operators AND , OR
Below table you can use
>>>True and True
True
>>>True and False
False
>>>True or False
True
>>>False or False
False
>>>Boo1=True
>>>Boo2=False
>>>Boo1 and Boo2
True
>>>Boo1=True
>>>Boo1 not
False
>>>’Network’==‘network’
False
>>>’Network’==‘Network’
True

Lists with Boolean
We can check if the List is empty or not.
>>>List2=['Vishnu','Vardhan']
>>>List2
['Vishnu', 'Vardhan']
>>>if List2:
... print("The list is not empty")
... else:
... print("The list is empty")
...
The list is not empty

Creating a List using Split
You can chop a string to create a list.
>>>Name="Vishnu/Vardhan/Maddy/Rock"
>>>Name
'Vishnu/Vardhan/Maddy/Rock'
>>>Name.split("/")
['Vishnu', 'Vardhan', 'Maddy', 'Rock']
>>>Name="vishnu Vardhan"
>>>Name.split(" ")
['vishnu', 'Vardhan']
>>>List1=Name.split(" ")
>>>List1
['vishnu', 'Vardhan']
>>>List1[1]
'Vardhan'
>>>List1[0]
'vishnu'
>>>Name[0]
'v'

Lists Vs Tuples
Tuples are Immutable meaning once set the values cannot be changed.
They collet some heterogeneous values.
Lists are Mutable meaning these values can be changed
They collect only homogeneous values.

Lists in Lists
We can use Lists inside a list.
>>>List1=['R1','R2','R3']
>>>List2=['S1','S2','S3']
>>>List1
['R1', 'R2', 'R3']
>>>List2
['S1', 'S2', 'S3']
>>>List3=[List1,List2]
>>>List3
[['R1', 'R2', 'R3'], ['S1', 'S2', 'S3']]
>>>List3[0][1] #Using this you can check 1st list
second value
'R2'
>>>List3[1][2]
'S3

Extending a lists
We can extend a list using .extend command like below
>>>List1
['R1', 'R2', 'R3']
>>>List1.append("R4")
>>>List1
['R1', 'R2', 'R3', 'R4']
>>>List2
['S1', 'S2', 'S3']
>>>List1.extend(List2)
List1
['R10', 'R2', 'R3', 'R4', 'S1', 'S2',
'S3']
>>>Router_list1=['R1', 'R2', 'R3', 'R4']
>>>Router_list2=['R5','R6','R7','R8']
>>>Router_list2 += Router_list2
>>>Router_list1
['R1', 'R2', 'R3', 'R4', 'R5', 'R6', 'R7',
'R8']

Other stuffs we can do with Lists
Below link can help you to find a reference.
https://docs.python.org/2/tutorial/datastructures.html
>>>Router_list1=['R1', 'R2', 'R3', 'R4']
>>>Router_list1.insert(0,"R0")
['R0','R1', 'R2', 'R3', 'R4']

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