THAI CPE

plawansai

External Resources:

Network Transformation and Essential Skills for Next Generation Network Engineers
www.ciscolive.com/online/connect/sessionDetail.ww?SESSION_ID=92606
Python Programming for Network Engineers
www.youtube.com/playlist?list=PLhfrWIlLOoKPn7T9FtvbOWX8GxgsFFNwn
packetpushers.net/next-generation-network-engineers
Is the CCIE Dead? Programming not Configuring Future IT
www.ciscolive.com/online/connect/sessionDetail.ww?SESSION_ID=94452
learninglabs.cisco.com/tracks/programming-dna

Method of Procedure (MOP) Is Largely Manual

Pre-maintenance Checks
+ Manually verify system state and readiness for MOP deployment
+ No way to track/predict an impact on the network: Will I violate my SLA?
Maintenance
+ Node Cost out
+ Apply Software updates
+ Apply Configuration changes
+ Verity system state to ensure updates correctly deployed
+ Node Cost in
Post Maintenance
+ Topology verification
+ Network state consistency check

Cause:

Time Consuming
Expensive
Error Prone

Network Change Automation

Time Effective
Low Cost
Error Free

Job Roles Are Shifting for Network Engineers:

Do Less of...

Device configurations
Continuous operations
Problem resolution
Hardware deployments
Monitoring and reporting
CLI entries and scripting
Hands-on repairs/deployments

Do More of...

Service innovation
Architectural (end-to-end) design
Network analytics & optimization
Programming - APIs versus CLI
Software administration
Comprehensive policy management
Systems integration/validation

Why Python For Network Engineering?

Is Python considered Easy? HUH?

MANY OF THE CONCEPTS ARE THE SAME BUT THE SYNTAX IS EASIER IN PYTHON

C++:

#include stdout

int main()
{
std::count << "Hello, world!\n";
}

PYTHON:

print("Hello, world!")

Notepad ++
notepad-plus-plus.org/download

Python
www.python.org/downloads

GNS3
www.gns3.com

Virtual Box
www.virtualbox.org/wiki/Downloads

C:\Python27>python
Python 2.7.13 (v2.7.13:a06454b1afa1, Dec 17 2016, 20:42:59) [MSC v.1500 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> "hello world"
'hello world'
>>> exit()

1. intro.py

print "hello world 2"

C:\Python27>python intro.py
hello world 2

Integer & Float:

Assigning Values to Variables:

counter = 100 # An integer assignment (10, 100, -786)
miles = 1000.0 # A floating point (0.0, 15.20, -21.9)
name = "John" # A string

Single value to several variables:

a = b = c = 1

Multiple objects to multiple variables:

a, b, c = 1, 2, "john"

Delete reference to a number object:

del var
del var_a, var_b

C:\Python27>python
Python 2.7.13 (v2.7.13:a06454b1afa1, Dec 17 2016, 20:42:59) [MSC v.1500 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> counter = 100
>>> counter
100
>>> anything=100
>>> anything
100
>>> miles = 1000.5
>>> miles
1000.5
>>> name = "John"
>>> name
'John'
>>> name = 'John155'
>>> name
'John155'

>>> a=b=c =1
>>> a
1
>>> b
1
>>> c
1
>>> del a
>>> a
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'a' is not defined
>>> del b
>>> b
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'b' is not defined
>>> del c
>>> c
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'c' is not defined
>>> a,b,c = 1,2.8,'Jhon'
>>> a
1
>>> b
2.8
>>> c
'Jhon'
>>> exit()

2. Ex.py

counter = 500
miles = 2000.15
name = 'Andrew'

print counter
print miles
print name

print counter, miles, name

print 'The counter value is: ', counter

C:\Python27>python Ex.py
500
2000.15
Andrew
500 2000.15 Andrew
The counter value is: 500

String:

str = 'Hello World!"
print str # Prints a complete string
print str[0] # Prints first character of the string
print str[2:5] # Prints characters starting from 3rd to 5th
print str[2:] # Prints string starting from 3rd character
print str * 2 # Prints string two times
print str + "TEST" # Prints concatenated string

C:\Python27>python
Python 2.7.13 (v2.7.13:a06454b1afa1, Dec 17 2016, 20:42:59) [MSC v.1500 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> a
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'a' is not defined
>>> a = 'Some text'
>>> a = 'Chevy 427'
>>> a
'Chevy 427'
>>> a = 'Hello'
>>> b = 'World'
>>> a
'Hello'
>>> b
'World'
>>> c = a + b
>>> c
'HelloWorld'
>>> d = b + a
>>> d
'WorldHello'
>>> 50 + 30
80
>>> '50'+'30'
'5030'
>>> str = "Hello World"
>>> str
'Hello World'
>>> str[0]
'H'
>>> str[10]
'd'
>>> str[2:5]
'llo'
>>> str[2:8]
'llo Wo'
>>> str[:8]
'Hello Wo'
>>> str[2:]
'llo World'
>>> str[:]
'Hello World'
>>> str
'Hello World'
>>> new_string = "test "
>>> new_string
'test '
>>> new_string * 4
'test test test test '
>>> new_string + new_string
'test test '
>>> str= new_string * 4
>>> str
'test test test test '
>>> str= str + str
>>> str
'test test test test test test test test '

3. Ex2.py

str = 'Hello World'
print str

first = str[:5]*4
next = str[6:]*3

print 'The first word is: ', first
print 'The next word is: ', next

C:\Python27>python Ex2.py
Hello World
The first word is: HelloHelloHelloHello
The next word is: WorldWorldWorld

Lists:

list1 = ['physics', 'chemistry', 1997, 2000];
list2 = [1, 2, 3, 4, 5, 6, 7 ];
list3 = ["a", "b", "c", "d"];
print "list1[0]: ", list1[0]
print "list2[1:5]: ", list2[1:5]
print "Value available at index 2 : "
print list1[2]
list1[2] = 2001;
print "New value available at index 2 : "
print list1[2]
del list1[2];
print "After deleting value at index 2 : "
print list1

len([1, 2, 3]) = 3 < Length

[1, 2, 3] + [4, 5, 6] = [1, 2, 3, 4, 5, 6] < Concatenation

['Hi!'] * 4 = ['Hi!', 'Hi!', 'Hi!', 'Hi!'] < Repetition

B-)

plawansai

C:\Python27>python
Python 2.7.13 (v2.7.13:a06454b1afa1, Dec 17 2016, 20:42:59) [MSC v.1500 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> list1 = ['physics','chemistry',1997,2000]
>>> list1
['physics', 'chemistry', 1997, 2000]
>>> list1[1]
'chemistry'
>>> list1[1]='org chemistry'
>>> list1
['physics', 'org chemistry', 1997, 2000]
>>> list2 = [1,2,3,4,5]
>>> list2
[1, 2, 3, 4, 5]
>>> list2*3
[1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5]
>>> list3 = ['w','e','h']
>>> list3[2]
'h'
>>> newstr=list1[0]
>>> newstr
'physics'
>>> newstr[:4]
'phys'
>>> list1[3]=2001
>>> list1
['physics', 'org chemistry', 1997, 2001]

4. Ex3.py

list1 =['phy','chem',1997,'2001']
print 'list before update: ',list1
list1[2] = 2000
list1[3] = 2020
print 'list after update: ',list1

C:\Python27>python Ex3.py
list before update: ['phy', 'chem', 1997, '2001']
list after update: ['phy', 'chem', 2000, 2020]

Tuple:
The differences between tuples and lists are, the tuples cannot be changed unlike lists and tuples use parentheses, whereas lists use square brackets.

tup1 = ('physics', 'chemistry', 1997, 2000);
tup2 = (1, 2, 3, 4, 5, 6, 7);
tup3 = "a", "b", "c", "d";
print "tup1[0]: ", tup1[0]
print "tup2[1:5]: ", tup2[1:5]

The empty tuple:

tup1 = ();

A tuple containing a single value:

tup1 = (50,);

Delete Tuple Elements:

del tuple;

>>> a = 1
>>> type(a)
<type 'int'>
>>> list1=['phys','chem',1997,2001]
>>> list1
['phys', 'chem', 1997, 2001]
>>> type(list1)
<type 'list'>
>>> tup1=('phys','chem',1997,2001)
>>> tup1
('phys', 'chem', 1997, 2001)
>>> type(tup1)
<type 'tuple'>
>>> del list1
>>> list1
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'list1' is not defined
>>> list1=('phys','chem',1997,2001)
>>> type(list1)
<type 'tuple'>
>>> tup1[3]
2001
>>> tup1[3]=2020
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'tuple' object does not support item assignment
>>> del tup1[3]
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'tuple' object doesn't support item deletion
>>> list1=['phys','chem',1997,2001]
>>> type(list1)
<type 'list'>
>>> list1[3]
2001
>>> list1[3]=2020
>>> list1
['phys', 'chem', 1997, 2020]
>>> del tup1
>>> tup1
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'tup1' is not defined

Dictionary:

dict = {'Name': 'Zara', 'Age': 7, 'Class': 'First'};
print "dict['Name']: ", dict['Name']

Updating Dictionary

dict['Age'] = 8; # update existing entry
dict['School'] = "DPS School"; # Add new entry

>>> dict = {'Name' : 'Zara','Age' : 7, 'Class' : 'first'}
>>> type(dict)
<type 'dict'>
>>> list1 = {'Name' : 'Zara','Age' : 7, 'Class' : 'first'}
>>> type(list1)
<type 'dict'>
>>> dict
{'Age': 7, 'Name': 'Zara', 'Class': 'first'}
>>> dict['Age']
7
>>> dict['age']
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
KeyError: 'age'
>>> dict['Age']=10
>>> dict
{'Age': 10, 'Name': 'Zara', 'Class': 'first'}
>>> dict['Class'] = 'Fifth'
>>> dict
{'Age': 10, 'Name': 'Zara', 'Class': 'Fifth'}
>>> del dict['Class']
>>> dict
{'Age': 10, 'Name': 'Zara'}

Suppose list1 is [3, 5, 25, 1, 3], min(list1) is 1.
min returns the minimum element in the list.
Use function random.shuffle(list1) to shuffle the list(say list1).
Suppose list1 is [1, 5, 9, sum(list1) is 15.
Sum returns the sum of all elements in the list.
Class is a user defined datatype, not a core datatype.
L = [1, 23, 'hello', 1], datatype is List.
List datatype can store any values within it.

Loop:

for iterating_var in sequence:
statement(s)
for letter in 'Python':
print 'Current Letter :', letter
fruits = ['banana', 'apple', 'mango']
for fruit in fruits:
print 'Current fruit :', fruit

5. forloops.py

fruits = ['banana', 'apple', 'mango', 'orange', 'berry']

for i in fruits:
    print 'Current the fruit is ', i
    print 'Goodbye'
print 'type = ', type(i)

for letter in 'Python':
    print 'Current Letter = ', letter
print 'Goodbye'

C:\Python27>python forloops.py
Current the fruit is banana
Goodbye
Current the fruit is apple
Goodbye
Current the fruit is mango
Goodbye
Current the fruit is orange
Goodbye
Current the fruit is berry
Goodbye
type = <type 'str'>
Current Letter = P
Current Letter = y
Current Letter = t
Current Letter = h
Current Letter = o
Current Letter = n
Goodbye

while expression:
statement(s)
count = 0
while (count < 9):
print 'The count is:', count
count = count + 1
print "Goodbye!"

6. Whileloops.py

count = 0
while (count < 9):
print 'The count is:', count
count = count + 1
print "Loop has done!"

C:\Python27>python Whileloops.py
The count is: 0
The count is: 1
The count is: 2
The count is: 3
The count is: 4
The count is: 5
The count is: 6
The count is: 7
The count is: 8
Loop has done!

for iterating_var in sequence:
for iterating_var in sequence:
statements(s)
statements(s)
while expression:
while expression:
statement(s)
statement(s)

7. nest.py

for i in range(1,5):
    for j in range(1,3):
        print "j=",j
    print " *i=",i
print "loops done"

C:\Python27>python nest.py
j= 1
j= 2
*i= 1
j= 1
j= 2
*i= 2
j= 1
j= 2
*i= 3
j= 1
j= 2
*i= 4
loops done

x = ['ab', 'cd']
for i in x:
i.upper()
print(x)
Output: ['ab','cd']
The function upper() does not modify a string in place, it returns a new string which isn't being stored anywhere.
i=1
while True:
if i%007 == 0:
break
print(i)
i += 1
Output: 1 2 3 4 5 6

B-)

plawansai

Control:

if expression:
statement(s)
var1 = 100
if var1:
print "1 - Got a true expression value"
print var1
var2 = 0
if var2:
print "2 - Got a true expression value"
print var2
print "Good bye!"

8. if.py

var1 = 'area'
if var1 == 'area':
print 'Area = length * width'

var1 = 'volume'
if var1 == 'volume':
print 'Volume = length & width * height'

var1 = 100
if var1:
    print "1 - true"
    print var1

var2 = 0
if var2:
    print '2 - true'
    print var2

var3 = 'a'
if var3:
    print "3 - true"
    print var3

var4 = ''
if var4:
    print "4 - true"
    print var4

C:\Python27>python if.py
Area = length * width
Volume = length & width * height
1 - true
100
3 - true
a

if expression:
statement(s)
else
statement(s)

9. ifelse.py

var1= 100
if var1:
    print ' 1 - true'
    print var1
else:
    print ' 1 - false'

var2 = 0
if var2:
    print '2 - got true'
    print var2
else:
    print '2 - got false'
    print var2

print 'goodbye'

C:\Python27>python ifelse.py
1 - true
100
2 - got false
0
goodbye

if expression1:
statement(s)
elif expression2:
statement(s)
elif expression3:
statement(s)
else:
statement(s)

10. ifelif.py

var = 100
if var == 100:
    print '1 got true'
    print var

elif var == 150:
    print '2 got true'
    print var

elif var == 100:
    print '3 got true'
    print var

else:
    print '4 got false'
    print var

print 'goodbye'

C:\Python27>python ifelif.py
1 got true
100
goodbye

Operators:

>>> a=10
>>> b=20
>>> a+b
30
>>> a-b
-10
>>> a*b
200
>>> b/a
2
>>> b%a => Modulus: / but returns remainder
0
>>> b=23
>>> b%a
3
>>> a=4
>>> b=3
>>> a**b => a^b
64
>>> 9//2 => / but the digits after the decimal point are removed
4
>>> 8//2
4
>>> 8.5//2
4.0
>>> 8.5/2
4.25

11. operators.py

a = 100
b = 100
if (a == b):
    print 'True'
    print 'a =', a, '== b =', b
    print ''

a = 10
if (a != b):
    print 'True'
    print 'a =', a, '!= b =', b
    print ''

a = 100
if (a <> b):
    print 'True'
    print 'a =', a, 'b =', b
else:
    print 'False - <>'
    print 'a =', a, 'b =', b
    print ''

b = 10
if (a > b):
    print 'True'
    print 'a =', a, '> b =', b
    print ''

if (a < b):
    print 'True'
    print 'a =', a, 'b =', b
else:
    print 'False - <'
    print 'a =', a, 'b =', b
    print ''

if (a <= b):
    print 'True'
    print 'a =', a, 'b =', b
else:
    print 'False - <='
    print 'a =', a, 'b =', b
    print ''

if (a >= b):
    print 'True'
    print 'a =', a, '>= b =', b
    print ''

b = 100
if (a <= b):
    print 'True'
    print 'a =', a, '<= b =', b

print 'end'

C:\Python27>python operators.py
True
a = 100 == b = 100

True
a = 10 != b = 100

False - <>
a = 100 b = 100

True
a = 100 > b = 10

False - <
a = 100 b = 10

False - <=
a = 100 b = 10

True
a = 100 >= b = 10

True
a = 100 <= b = 100
end

12. andor.py

a = 1
b = 1000

if (a and b):
    print 'True'
    print 'a =', a, 'and b =', b
    print ''

a = 0
if (a or b):
    print 'True'
    print 'a =', a, 'or b =', b
    print ''

if not(a and b):
    print 'True'
    print 'not(a =', a, 'and b =', b,')'
print 'end'

C:\Python27>python andor.py
True
a = 1 and b = 1000

True
a = 0 or b = 1000

True
not(a = 0 and b = 1000 )
end

Function:

def functionname( parameters ):
"function_docstring"
function_suite
return [expression]

13. funexamp.py

# Function definition is here
def print_me( str ):
    "This prints a passed string into this function"
    print str
    return;

# Now you can call print_me function
print_me("I'm the first call to user defined function!")

a="Again second call to the same function"
print_me(a)

print 'stop'

C:\Python27>python funexamp.py
I'm the first call to user defined function!
Again second call to the same function
stop

14. funexamp2.py

# Function definition is here
def change_me( my_list ):
    "This changes a passed list into this function"
    my_list.append([1,2,3,4]);
    return;

# Now you can call change_me function
my_list = [10,20,30];
change_me( my_list);
print "Values the function: ", my_list

C:\Python27>python funexamp2.py
Values the function: [10, 20, 30, [1, 2, 3, 4]]

Project 1: Change Program

You are creating software to be sold by your company to vending machine manufacturers to count and return change. You are part of a Team, more code may be required to complete the obligations to the customer but you have been given the following assignment

Items in the vending machine have a cost value between .01 - .99
You will use a Randomly generated value from .01 to .99 to simulate the cost of possible vending items.
The customer chooses an item and enters some coins, the machine's electronics determine the coins to be either (Customer enters coins)

15. proj1.py
Input coins:

quarter=25
dime = 10
nickel = 5
penny = 1
item_cost = 54

print 'This item costs ', item_cost
print ('**Enter coins in form 1,5,10,25,..')

coin_value = input('enter coin values')

print coin_value

C:\Python27>python proj1.py
This item costs 54
**Enter coins in form 1,5,10,25,..
enter coin values 1,5,10,25,1,1,10
(1, 5, 10, 25, 1, 1, 10)

C:\Python27>python proj1.py
This item costs 54
**Enter coins in form 1,5,10,25,..
enter coin values 1,5,10,25,1,1,10,12,17
(1, 5, 10, 25, 1, 1, 10, 12, 17)

B-)

plawansai

Invalid Coins:

num_coins = len(coin_value)
print coin_value, num_coins
count = 0

while count < num_coins: # step each look for invalid
    current_value = coin_value[count]
    coin_amt = int(current_value)
    print 'count = ', count, 'Coin Amount = ', coin_amt
    count += 1
    if coin_amt not in (quarter, dime, nickel, penny):
        print 'An Invalid coin was detected'
        count = 0
        coin_value = 0
        num_coins = 0
        coin_amt = 0
        coin_value = input('enter coin values')
        num_coins = len(coin_value)

C:\Python27>python proj1.py
This item costs 54
**Enter coins in form 1,5,10,25,..
enter coin values 5,5,1,1,12,10
(5, 5, 1, 1, 12, 10) 6
count = 0 Coin Amount = 5
count = 1 Coin Amount = 5
count = 2 Coin Amount = 1
count = 3 Coin Amount = 1
count = 4 Coin Amount = 12
An Invalid coin was detected
enter coin values 5,5,1,1,10
count = 0 Coin Amount = 5
count = 1 Coin Amount = 5
count = 2 Coin Amount = 1
count = 3 Coin Amount = 1
count = 4 Coin Amount = 10

Coin Count:

total_quarters = 0    #This is setting coin count to zero only
total_dimes = 0
total_nickels = 0
total_pennies = 0

print coin_value, num_coins

while count < num_coins:    # step each look for invalid
    current_value = coin_value[count]
    coin_amt = int(current_value)
    print 'count = ', count, 'Coin Amount = ', coin_amt
    count += 1

    if coin_amt not in (quarter, dime, nickel, penny):
        print 'An Invalid coin was detected'
        count = 0
        coin_value = 0
        num_coins = 0
        coin_amt = 0

        total_quarters = 0    #This is setting coin count to zero only
        total_dimes = 0    #need to deduct the coins returned
        total_nickels = 0    #need to fix this.
        total_pennies = 0

        coin_value = input('enter coin values ')
        num_coins = len(coin_value)

    elif coin_amt == 25:
        total_quarters += 1
    elif coin_amt == 10:
        total_dimes += 1
    elif coin_amt == 5:
        total_nickels += 1
    elif coin_amt == 1:
        total_pennies += 1

coin_count = (total_quarters, total_dimes, total_nickels, total_pennies)
total_value = total_quarters * 25 + total_dimes * 10 + total_nickels * 5 + total_pennies

print 'Coin count = q,d,n,p ' ,coin_count
print 'Total value =',total_value

C:\Python27>python proj1.py
This item costs 54
**Enter coins in form 1,5,10,25,..
enter coin values 5,10,5,10
(5, 10, 5, 10) 4
count = 0 Coin Amount = 5
count = 1 Coin Amount = 10
count = 2 Coin Amount = 5
count = 3 Coin Amount = 10
Coin count = q,d,n,p (0, 2, 2, 0)
Total value = 30

Make a decision:

done = 0

while done == 0:
    while count < num_coins:    # step each look for invalid
        current_value = coin_value[count]
        coin_amt = int(current_value)
        print 'count = ', count, 'Coin Amount = ', coin_amt
        count += 1
        if coin_amt not in (quarter, dime, nickel, penny):
    ...
    print 'Total value =',total_value

    # 3 conditions

    if item_cost == total_value:
        # done
        print 'Thank you please take your item'
        done = 1
    elif item_cost < total_value:
        # return change
        return_change = total_value - item_cost
        # *update coin count*
        print 'Please take your change of ',return_change
        print 'Still need to update coin count'
        done = 1
    elif item_cost > total_value:
        # input more coins
        item_cost = item_cost - total_value
        # *Do everything over until done*
        print 'Not enough money please enter ',item_cost
        count = 0
        coin_value = 0
        num_coins = 0
        coin_amt = 0
        total_quarters = 0 # fix this total as well
        total_dimes = 0
        total_nickels = 0
        total_pennies = 0
        coin_value = input('enter coin values')
        num_coins = len(coin_value)

C:\Python27>python proj1.py
This item costs 54
**Enter coins in form 1,5,10,25,..
enter coin values 25,25,1,1,1,1
(25, 25, 1, 1, 1, 1) 6
count = 0 Coin Amount = 25
count = 1 Coin Amount = 25
count = 2 Coin Amount = 1
count = 3 Coin Amount = 1
count = 4 Coin Amount = 1
count = 5 Coin Amount = 1
Coin count = q,d,n,p (2, 0, 0, 4)
Total value = 54
Thank you please take your item

C:\Python27>python proj1.py
This item costs 54
**Enter coins in form 1,5,10,25,..
enter coin values 25,25,10
(25, 25, 10) 3
count = 0 Coin Amount = 25
count = 1 Coin Amount = 25
count = 2 Coin Amount = 10
Coin count = q,d,n,p (2, 1, 0, 0)
Total value = 60
Please take your change of 6
Still need to update coin count

C:\Python27>python proj1.py
This item costs 54
**Enter coins in form 1,5,10,25,..
enter coin values 25,25
(25, 25) 2
count = 0 Coin Amount = 25
count = 1 Coin Amount = 25
Coin count = q,d,n,p (2, 0, 0, 0)
Total value = 50
Not enough money please enter 4
enter coin values 1,1,1,1
count = 0 Coin Amount = 1
count = 1 Coin Amount = 1
count = 2 Coin Amount = 1
count = 3 Coin Amount = 1
Coin count = q,d,n,p (0, 0, 0, 4)
Total value = 4
Thank you please take your item

B-)

plawansai

16. proj1_g2.py

upload.i4th.in.th:8080/th/download.php?id=593CE4151

Case: 1st, Condition: Exact Change, Change in: 2 quarters, Total coins: (2,0,0,0), Total Value: 50, Action: Take Item

C:\Python27>python proj1_g2.py

*************New Purchase****************
This item costs 50
**Enter coins in form 1,5,10,25,..
25,25
(25, 25) 2
Is machine Being Serviced?
0 for no or 1 for yes
0
Checking for invalid coins
Checking for invalid coins
Thank you please take your item
Coin count= q,d,n,p (2, 0, 0, 0)
Total value= 50
***********End of Purchase****************

Case: 2nd, Condition: Exact Change, Change in: 5 dimes, Total coins: (2,5,0,0), Total Value: 100, Action: Take Item

*************New Purchase****************
This item costs 50
**Enter coins in form 1,5,10,25,..
10,10,10,10,10
(10, 10, 10, 10, 10) 5
Is machine Being Serviced?
0 for no or 1 for yes
0
Checking for invalid coins
Checking for invalid coins
Checking for invalid coins
Checking for invalid coins
Checking for invalid coins
Thank you please take your item
Coin count= q,d,n,p (2, 5, 0, 0)
Total value= 100
***********End of Purchase****************

Case: 3rd, Condition: Too Much, Change in: 2 quarters 2 dimes, Total coins: (4,5,0,0), Total Value: 150, Action: Return change

*************New Purchase****************
This item costs 50
**Enter coins in form 1,5,10,25,..
25,25,10,10
(25, 25, 10, 10) 4
Is machine Being Serviced?
0 for no or 1 for yes
0
Checking for invalid coins
Checking for invalid coins
Checking for invalid coins
Checking for invalid coins
Return Change (0, 2, 0, 0)
updated coin totals = q,d,n,p (4, 5, 0, 0)
Thank you please take your item
Coin count= q,d,n,p (4, 5, 0, 0)
Total value= 150
***********End of Purchase****************

Case: 4th, Condition: Not enough, Change in: 1 quarters 1 nickle, Total coins: (5,5,1,0), Total Value: 180, Action: Enter difference

*************New Purchase****************
This item costs 50
**Enter coins in form 1,5,10,25,..
25,5
(25, 5) 2
Is machine Being Serviced?
0 for no or 1 for yes
0
Checking for invalid coins
Checking for invalid coins
Not enough money please enter 20
Coin count= q,d,n,p (5, 5, 1, 0)
Total value= 180
enter coin values 10,5,5

Checking for invalid coins
Checking for invalid coins
Checking for invalid coins
Thank you please take your item
Coin count= q,d,n,p (5, 6, 3, 0)
Total value= 200
***********End of Purchase****************

Case: 5th, Condition: Invalid Coin, Change in: 10,40, Total coins: (5,6,3,0), Total Value: 200, Action: return coin

*************New Purchase****************
This item costs 50
**Enter coins in form 1,5,10,25,..
10,40
(10, 40) 2
Is machine Being Serviced?
0 for no or 1 for yes
0
Checking for invalid coins
Checking for invalid coins
An Invalid coin was detected please take change
Coin count is (5, 6, 3, 0)
enter coin values 25,25
Checking for invalid coins
Checking for invalid coins
Thank you please take your item
Coin count= q,d,n,p (7, 6, 3, 0)
Total value= 250
***********End of Purchase****************

gns3.com

17. func.py

#Procedure 1
def main():
    try:
        # Get a number to manipulate
        num = float(input("Please enter a number to manipulate.\n"))
        # Store the result of the value, after it has been manipulated
        # by Procedure 2
        addednum = addfive(num)
        # Store the result of the value, after it has been manipulated
        # by Procedure 3
        multipliednum = multiply(addednum)
        # Send the value to Procedure 4
        display(multipliednum)
    # Deal with exceptions from non-numeric user entry
    except ValueError:
        print("You must enter a valid number.\n")
        # Reset the value of num, to clear non-numeric data.
        num = 0
        # Call main, again.
        main()

# Procedure 2
def addfive(num):
    return num + 5

# Procedure 3
def multiply(addednum):
    return addednum * 2

# Procedure 4
def display(multi):
    # Display the final value
    print("The final value is ",multi)

# Call Procedure 1
main()

C:\Python27>python func.py
Please enter a number to manipulate.
'k'
You must enter a valid number.

Please enter a number to manipulate.
2
('The final value is ', 14.0)

18. class1.py

class Numchange:

    def _int_(self):
        self._number = 0
    def addfive(self,num):
        self._number = num
        return self._number + 5

    def multiply(self,added):
        self._added = added
        return self._added * 2

19. op1.py

import class1

maths = class1.Numchange()

def main():

    num = float(input("Please enter a number.\n"))

    added = maths.addfive(num)

    multip = maths.multiply(added)

    print("The manipulated value is ", multip)

main()

C:\Python27>python op1.py
Please enter a number.
2
('The manipulated value is ', 14.0)

Functions are reusable pieces of the program. They allow you to give a name to a block of statements, allowing you to run that block using the specified name anywhere in your program and any number of times.
Def is a keyword used for function.
def sayHello():
print('Hello World!')
sayHello()
sayHello()

Output: Hello World! Hello World!

Functions are defined using the def keyword. After this keyword comes an identifier name for the function, followed by a pair of parentheses which may enclose some names of variables, and by the final colon that ends the line. Next follows the block of statements that are part of this function.

B-)

plawansai

20. TN3.py

import telnetlib
import time

def telnet_gns3(ip):
    wait = .2

    connection = telnetlib.Telnet(ip, 23, 5)

    output = connection.read_until("Password:", 5)
    connection.write('cisco' + "\n")
    connection.write('ena' + "\n")

    output = connection.read_until("Password:", 5)
    connection.write('cisco' + "\n")
    time.sleep(wait)

    connection.write("conf term" + "\n")
    time.sleep(wait)
    connection.write("int f0/0" + "\n")
    time.sleep(wait)
    connection.write("ip add 6.5.5.5 255.0.0.0" + "\n")
    time.sleep(wait)
    connection.write("end" + "\n")

    time.sleep(wait)
    connection.write("sho ip int brief" + "\n")
    time.sleep(wait)

    output = connection.read_very_eager()
    print output

    connection.close()

#Call gns3
telnet_gns3('192.168.56.101')

C:\Python27>python TN3.py

ESW1#conf term
Enter configuration commands, one per line. End with CNTL/Z.
ESW1(config)#int f0/0
ESW1(config-if)#ip add 6.5.5.5 255.0.0.0
ESW1(config-if)#end
ESW1#sho ip int brief
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            6.5.5.5         YES manual administratively down down
FastEthernet0/1            192.168.56.101 YES manual up                    up
FastEthernet1/0            unassigned      YES unset up                    down
FastEthernet1/1            unassigned      YES unset up                    down
FastEthernet1/2            unassigned      YES unset up                    down
FastEthernet1/3            unassigned      YES unset up                    down
FastEthernet1/4            unassigned      YES unset up                    down
FastEthernet1/5            unassigned      YES unset up                    down
FastEthernet1/6            unassigned      YES unset up                    down
FastEthernet1/7            unassigned      YES unset up                    down
FastEthernet1/8            unassigned      YES unset up                    down
--More--

21. TN4.py

...
    output = connection.read_very_eager()
    # - Write output to a file -
    ESW1 = open("ESW1", "w")
    ESW1.write(output)
    ESW1.close
    print output
...

upload.i4th.in.th/th/download.php?id=59493B941

22. TN7.py

import telnetlib
import time

def telnet_gns3(ip):
    wait = 5
    # -Sign in-
    connection = telnetlib.Telnet(ip, 23, 5)
    connection.read_until("Password:", 5)
    connection.write('cisco' + "\n")
    connection.write('ena' + "\n")
    connection.read_until("Password:", 5)
    connection.write('cisco' + "\n")
    # -Sign in-

    # -Command loop-
    cmd_file = raw_input('Enter command file name and extension: ')
    selected_cmd_file = open(cmd_file, 'r')
    selected_cmd_file.seek(0)
    for each_line in selected_cmd_file.readlines():
        time.sleep(wait)
        connection.write(each_line)
        connection.write("\n")
    # -Command loop-

    # -Write output to a file-
    time.sleep(wait)
    output = connection.read_very_eager()
    ESW1 = open("ESW1", "w")
    ESW1.write(output)
    ESW1.close
    # -Write output to a file-
    print output

    connection.close()

#Call gns3
telnet_gns3('192.168.56.101')

testcmds.txt

conf term
int f0/0
ip add 5.5.5.5 255.0.0.0
end
sho ip int brief
sho run

C:\Python27>python TN7.py
Enter command file name and extension: testcmds.txt

ESW1#conf term
Enter configuration commands, one per line. End with CNTL/Z.
ESW1(config)#
ESW1(config)#int f0/0
ESW1(config-if)#
ESW1(config-if)#ip add 5.5.5.5 255.0.0.0
ESW1(config-if)#
ESW1(config-if)#end
ESW1#
ESW1#sho ip int brief
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            5.5.5.5         YES manual administratively down down
FastEthernet0/1            192.168.56.101 YES manual up                    up
...
upload.i4th.in.th/th/download.php?id=594E30291

B-)

plawansai

Is the CCIE Dead? The Automated Future of IT

Drive For Show And Putt For Dough - ลูกไดรฟ์มีไว้อวด ลูกพัตต์มีไว้เอาเงิน

GUI For Show And API For Dough

Why API?

Automation
Integration
Innovation

What about networking skills?

"A fool with a tool is still a fool"

23. TN20.py

upload.i4th.in.th/th/download.php?id=59A27D191

C:\Python27>python TN20.py
Enter command file name and extension: ESW1cmds.txt
Enter command file name and extension: ESW2cmds.txt
Enter command file name and extension: ESW3cmds.txt
Enter command file name and extension: ESW4cmds.txt

IOS Telnet Configuration:

ena sec cisco
!
line vty 0 4
exec-timeout 5 0
password cisco
login

Telnet to n Number of Routers:

get the value:
>>> ip = '192.168.1.101'
>>> ip
'192.168.1.101'
>>> len(ip)-1
12
>>> last_char = len(ip)-1
>>> last_char
12
>>> ip[last_char]
'1'

>>> ip[10:13]
'101'
>>> quad = ip[len(ip)-3:len(ip)]
>>> quad
'101'
>>> type(quad)
<type 'str'>
convert to int:
>>> int(ip[last_char])
1
>>> current_int = int(ip[last_char])

>>> int(quad)
101
>>> quad_int = int(quad)
>>> quad_int
101
add 1:
>>> current_int = current_int + 1
>>> current_int
2

>>> quad_int = quad_int + 1
>>> quad_int
102
convert to string:
>>> quads = str(quad_int)
>>> quads
'102'
ip # with the new:
>>> temp_ip = ip[:len(ip)-3]
>>> temp_ip
'192.168.1.'
>>> ip = temp_ip + quads
>>> ip
'192.168.1.102'
increment through for n number of routers

24. TN24.py

ip = '192.168.1.101'
n = 27
#start loop
for router in range(1,n):
    print(router,ip)
    quad = ip[len(ip)-3:len(ip)]
    quad_int = int(quad)
    quad_int = quad_int + 1
    quads = str(quad_int)
    temp_ip = ip[:len(ip)-3] # strings immutable
    ip = temp_ip + quads

C:\Python27>python TN24.py
(1, '192.168.1.101')
(2, '192.168.1.102')
...
(26, '192.168.1.126')

25. TN25.py

change TN20.py since:
#loop n number times where n = the number of routers
ip = '192.168.56.101'
n = 3
#start loop
for router in range(1,n):
    telnet_gns3(ip,router)
    print(router,ip)
    quad = ip[len(ip)-3:len(ip)]
    quad_int = int(quad)
    quad_int = quad_int + 1
    quads = str(quad_int)
    temp_ip = ip[:len(ip)-3] # strings immutable
    ip = temp_ip + quads

C:\Python27>python TN25.py
Enter command file name and extension: ESW1cmds.txt
(1, '192.168.56.101')
Enter command file name and extension: ESW2cmds.txt
(2, '192.168.56.102')

26. TN1000.py

...
    # -Write output to a file-
    ESW = ['ESW0','ESW1','ESW2','ESW3','ESW4','ESW5']
    time.sleep(wait)
    output = connection.read_very_eager()
    ESW[router] = open("ESW" + str(router), "w")
    ESW[router].write(output)
    ESW[router].close
    # -Write output to a file-
...

27. TN1001.py

...
    # -Write output to a file-
    time.sleep(wait)
    output = connection.read_very_eager()
    ESWtemp = open("ESW" + str(router), "w")
    ESWtemp.write(output)
    ESWtemp.close
    # -Write output to a file-
...

>>> ip = '192.168.1.101'
>>> ip
'192.168.1.101'
>>> p3 = ip.rfind('.')
>>> p3
9
>>> temp_s = ip[:p3+1]
>>> temp_s
'192.168.1.'
>>> quad = ip[p3+1:]
>>> quad
'101'
>>> quad_int = int(quad)
>>> quad_int
101
>>> type(quad_int)
<type 'int'>

28. TN1003.py

ip = '1.1.12.5'
p3 = ip.rfind('.')
temp_s = ip[:p3+1]
quad = ip[p3+1:]
quad_int = int(quad)

n = 10
#start loop
for router in range(1,n):
    print(router,ip)
    quad_int = quad_int + 1
    quads = str(quad_int)
    ip = temp_s + quads

C:\Python27>python TN1003.py
(1, '1.1.12.5')
(2, '1.1.12.6')
(3, '1.1.12.7')
(4, '1.1.12.8')
(5, '1.1.12.9')
(6, '1.1.12.10')
(7, '1.1.12.11')
(8, '1.1.12.12')
(9, '1.1.12.13')

Change ESW1 & ESW2 Management IP to 192.168.x.99 - 100 respectively

29. TN2000.py

change TN1001.py by TN1003 since:
#loop n number times where n = the number of routers
ip = '192.168.56.99'

p3 = ip.rfind('.')
temp_s = ip[:p3+1]
quad = ip[p3+1:]
quad_int = int(quad)

n = 3
#start loop
for router in range(1,n):
    telnet_gns3(ip,router)
    print(router,ip)
    quad_int = quad_int + 1
    quads = str(quad_int)
    ip = temp_s + quads

C:\Python27>python TN2000.py
Enter command file name and extension: ESW1cmds.txt
(1, '192.168.56.99')
Enter command file name and extension: ESW2cmds.txt
(2, '192.168.56.100')

Program Your Career. Learn Network Programmability:

Network Engineer Job Role Evolution:

Digitization Is Changing The World:

Bookstore
Taxi
Music
Hotel
Print Advertising
Car
Point-of-Sale

CEO Technology Investment Priorities: 2014/15: Most Important Technology-Enabled Capability Investments Over the Next Five Years

Digital marketing 38%
E-commerce 34%
Customer experience management 34%
Business analytics 32%
Cloud business 27%
...
Additive manufacturing 4%
Gamification 4%
Robot staffing 4%
Neurobusiness 2%
Salesforce automation 1%

www.gartner.com/doc/2704918/gartner-ceo-senior-executive-survey

www.gartner.com/smarterwithgartner/2017-ceo-survey-infographic

Emerging Jobs of the Future: College students are studying to prepare for jobs that do not exist... yet

Business Transformation Architect
Cloud Architects/Brokers
Customer Outcome Evangelist
Cyber Security Specialist
Data Scientist
Innovation Specialist
Mobile Application Developer
Network Programmer
Process Control Engineer
Social Scientists

www.itcareerfinder.com/brain-food/blog/entry/best-computer-jobs-for-the-future.html

www.infoworld.com/article/3160526/application-development/infoworlds-2017-technology-of-the-year-award-winners.html

www.networkworld.com/article/3158845/lan-wan/software-may-be-eating-the-world-but-cumulus-networks-is-still-keen-on-hardware.html

B-)

plawansai

The Network at the Center of Every Evolution Step: Managing Your Career Through Key Market Transitions

Industry Relevant Bridge the Knowledge Gaps

Centralized > Silo'd > Unconnected > Network as Platform > Internet of Everything

Growing IT Talent Gaps
Re-skilling Needed
Evolving Job Roles By Industry
Programmability Skills Required
Business Skills In Demand
Business requirements for globalization, flexibility, speed
Line of Business involvement in IT spending
Consumerization of IT - software-based services
Disruptive technologies: cloud, mobility, social, video, Big Data

Networker Responsibilities are Growing and Shifting:

Responsibility Focus:

Increase of Design
Decrease of Deploy
Decrease of Operate
Increase of Optimize
Innovate
WAN, WLAN, Routers, Switches, UC, L4-7
Compute/Storage, Security, NFV, Orchestrators, Controllers, Hypervisors, Analytics, Automation, Transformation

<- Speeds - Users - Data Center - Mobile - Cloud - Threats - Big Data - Internet Of Things - SDN ->

Network Programmability in a Programmable Networking Environment:

What is Network Programmability?

Network Provisioning...:
App Developer - Application Tiers, Provider / Consumer Relationship -> NW Architect - Security Policy, QoS Policy, Other Policies -> NW Engineer - SSH -> Devices

Network Programmability...:
App Developer - Application Tiers, Provider / Consumer Relationship -> NW Architect - Security Policy, QoS Policy, Other Policies -> NW Engineer - Policy Construct -> APIC - Instantiate Policy -> Devices

Policy Construct:

Event Triggers -

Network Users:
- User-identifier (tenant/user)
- Application
- Location Device Type
Policy Properties:
- Policy Creator
- Policy Name
- Policy Scope
- Policy Priority
- Policy Time:
  - Start Time
  - End Time
  - Hard timeout
  - Idle timeout
  - recurrence
Resources:
- User-identifier (tenant/user)
- Application
- Device Type
- Location
Actions:
- Permit
- Deny
- Copy
- Monitor
- Redirect (L3, L4, L7)
- No copy
- No redirect
Action Properties:
- Priority Level
- Resource Level
- Experience Level
- Trust Level
- Destination
- Sample Rate
High-Level Business Intent Policies
Automatically converted to Network Language
Conflict Detection and Resolution
Extensible
Supports different patterns of policies:
- Access Policies
- Source-Destination Directional Policies
- Event - Condition - Action
- Includes Collections (Ex: a group of user ids, a group of applications, etc.)
- Choose custom tags for policies
- Choose multiple attributes in each category

Abstracting Conventional Policy Complexity:

Conventional Model:
Admin Driven [
- The What "Security Policy for Branch A"
- The How "Change ACLs in the Following Elements" ->
ACI Policy Model:
- The What "Security Policy" - Admin Driven
- ACI Constructs - Northbound APIs
- The How "Change ACLs in the Following Elements" - APIC EM ]

ACI Abstracts System Management and Enables Programmable Driven Policies

Network Architecture: The Design

B-)

THAI CPE

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