Class_Notes.txt

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Day 46: 10th Oct. 2024
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	Fundamentals of Python :::

	1. Overview of Python
	2. Features, Benefits, Uses of Python
	3. Installation and Setup of Python Environment
	4. Various Types of Sequencesin Python
	5. File Operations
	6. Python Functions
	7. OOPs Concepts
	8. Modules
	9. Errors and Exception Handling
	10. Python Console based application and Web Application using Flask
	11. Deploying and Consuming Python Applications
		
	Shell Scripting ??
	
	Programming Languages 	==> Used to Develop Business Applications 
	
	(vs) 
	
	Scripting Languages 	==> Used to perform any process automation 
	
	
	Use-Cases :::
	
		Scripting Languages :::
		
		
	Common Features or Concepts ???
	
	
	Integrated Development Environment for Python - IDLE
	
	Pycharm 
	
	Visual Studio Code 
	
	
	Validation Program :
	
	The User Credentials -- for login_page 
	- Involves Database validation 
	
		- Programming Languages - Java/C#
		
	Validation Program :
	
		Client Side Scripting 
		
		- Scripting Languages 
	
		xxxx@yyyy.com
		
		xxxx 
		
		xxx#asdf.com 
		
		xxx@adfs
		
		
	Tools --> 
	
	Logical Thinking!
	
	
	Programming/Scripting Logic ????
	
	Python -- Tools 
	
	
	Problem Statement ::
		- 
		
		What are all the steps involved to Create the program / source code?
				
		Analyze the Requirement 
		Design the solution 
			-> Algorithms 
				- Step-by-Step process to achieve any task 
				- Written in high-level language. It is independent of any Programming/Scripting Languages
				- Algorithms should always be an optimized one
				- It should be reusable and easily maintainable
				
			-> PsudoCode 
				- Step-by-Step process to achieve any task
				- It is based on the programming/Scripting Language 
					
			-> Program workflow - Flowcharts -- graphical views 
			
		Create a program/source code using actual programming/Scripting Language
		
	1.	
		a = 60 
		
		b = 30 
		
		c = 87
		
		
		Which is greatest number ?		result is ' c '
		
		Algorithm to find the greatest of these three numbers :
		
		
	2.
	
		a = 70 
		
		b = 40 
		
		Swap the number :
		
		==> Output  : a = 40  & b = 70 
		
			a,b = b,a			# Is this valid ?
			


			use new variable c ?
			
			c = a 
			
			a = b 
			
			b = c 
			
	3. 
		
		a = *
		
		b = $
		
		Swap a and b :
		
		==> Output  : a = $  & b = * 	


	4. 
	
		a = *
		
		
		Print :
		
			* 
			
	
	
	5. 	a = *
	
		Print output :
		
			*
			*	*
			*	*	*
			*	*	*	*
			*	*	*	*	*
			
			
	6. 	a = *
	
		Print output :
		
		*	*	*	*	*
			*	*	*
				*
			*	*	*	
		*	*	*	*	*
		
		
	7. 	a = 1

		Print output :
		
		1
		
		2	2
		
		3	3	3
		
		4	4	4	4
		
		5	5	5	5	5
		
		
		
	Working with Python :::

		- Install Python 				# https://www.python.org/downloads/
		
		- Install IDE - Visual Studio Code 
			
			
			
	Data ::
	
	
	variable 	 a = 5
		
	variable 	 b = "Hello"	
	
	
	
	
	Functions :::
	
		-	Function is a collection of variables and commands used to perform any task.
		
		
		>>>print("Hello")	1000 times ?
			Hello 
		
		Varibles 
			==> Local Varibles that are defined within the functions 
			==> Global Variables that are defined outside the functions
		
		Scope of the Variable is based on the declaration.
		
		
		
		z = 100;
		
		print(z)			# will work ==> 100
		
		def sum()			# Function Definition 
		{
			a = 5 
			b = 10 
			print(a)		# will work 
			c = a + b 		# 15!
			global z
			print(z)		# 100
			z = 300	
			print(z)		# 300
			
		}
		
		print(a) 		# will not work	| Function call
		print(z)		# 300	# Updated data 
		
		
		
		
#######################
Day 47: 14th Oct. 2024
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	Python Fundamentals :::
	
	
			ansible_facts{
				os_family : "Debian";
				os_Type	  : "Linux"
			}
			
			
			
		Email_ID = "asdfasdfa@asdf.com"

		Comm_Address = """asdfasdfasdfasd
						asdfasdfasdfasdf
						adfsdfasdfasdfasdf"""
		
		
		
		
		Var1 = ansible_facts 
		
		x = 5 
		
		
		
		print str1 ==> # Print entire value 
		
		
		Array 			# Is a group of variables with same name and datatype.
						# Each Element in array is identified by an index
						# Index are used to uniquely identify the elment in array.
						
			Eg.: a[5]	a = {1,2,3,4,5}
			
						a[0] = 1
						
						a[1] = 2 
						
						a[4] = 5
			
			
		In python, we have list that is similar to array 	
					List can have different types of data.
					
			
				list1 = [1,2,3,"hi","Hello"]
					
		sum(int a, int b)
		{
			c = a + b 
		}		
		
		
		List 			===> [1,2,"hello"]		# Updatable
		
		Set 			===> {1,2,3,4}			# Unique, Updatable 
		
		Tuple 			===> (1,2,3,4)			# Non-Updatable 
		
		Dictionary		===> {key1:value1,key2:value2} # Json file handling
		
	if 
	{
		if
		{	
			if 
			{
			
			}
		}
		
	}	
		
sa-instance1[5] = 
		
resource "aws_instance" "sa-instance1" {
  
  ami           = "ami-0dee22c13ea7a9a67"		
  instance_type = "t2.micro"
  key_name      = "ali-key"
  count			= 5

  tags = {
    Name = "Terrfaorm-TestInstance1"
  }
}
resource "aws_instance" "sa-instance2" {
  
  ami           = "ami-0dee22c13ea7a9a67"		
  instance_type = "t2.medium"
  key_name      = "ali-key"

  tags = {
    Name = "Terrfaorm-TestInstance1"
  }
}
sir in the above resource "aws_instance" "sa-instance1"
can you explain this line?
this is from terraform module
		
	
		
#######################
Day 48: 16th Oct. 2024
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	On Visual Studio Code 
	
		Install Python extension for Visual Studio Code 
		

x = 5
y = 6
print("Value of x:", x)
print("Value of y:", y)
print(8)
print(x)
		
		
x = input("Number: ")

if x < 0 or x > 10:
	print("Invalid number")
else:
	print("Good choice")
		
		
		
		
	year						2024	 
		months 						12 
			weeks						4
				days 						7
		
		
		

numbers = [2,3,4,5,6]			# index start from 0. i.e., -> i[0]=2,i[1]=3,i[2]=4.....i[4]=6
n=len(numbers)					# 5

for(i=0;i<n;i++)				# i = 0; 0 < 5 ==> True, print 
	print(i)					# 0,
	print(numbers[i])			# 2,
								# Add 1 to i ==> 
								# i = 1; 1 < 5 ==> True, print 
								# 1,
	                            # 3,
		                        # Add 1 to i ==>
								# i = 2; 2 < 5 ==> True, print 
								# 2,
	                            # 4,
		                        # Add 1 to i ==>			
								# i = 3; 3 < 5 ==> True, print 
								# 3,
	                            # 5,
		                        # Add 1 to i ==>		
								# i = 4; 4 < 5 ==> True, print 
								# 4,
	                            # 6,
		                        # Add 1 to i ==>	
								# i = 5; 5 < 5 ==> False, EXIT from loop 	
	
		
list1 = [1,2,3,4,5,6,7,8,9,10]			
n=len(list1)					
		
for(i=0;i<n;i++)			
	print(i)				
	print(list1[i])	
	
	s=list[i]						1 
	
	r=s%2 
	
	if r = 0
		print s

	
	output: {1,2,3,4,5,6,7,8,9,10}
	
	Even Numbers : {2,4,6,8,10}
	
	
	
	Object Oriented Programming :
	
		- Class 	-> Collection of Functions and Variables 
		
		- Object 	-> Instance of Class
		
		Class devOps {
				aws()			# Modules - Functions 
				azure()
			}

		Class devOps1 {
				aws()
				azure()
			}
			
		devOps d;
		
		d.aws()
		
		d.azure()
	
		
		devOps1 d1;
		
		d1.aws()
		
		d1.azure()	
		
		
		Inheritance ==> 
		
		Class1
		{
			function1()
			function2()
		}
		
		Class2 : Class1
		{
			function3()
			function4()
		}	

		Class1 obj1
		
			obj1.function1()
			obj1.function2()
		
		Class2 obj2
		
			obj2.function1()
			obj2.function3()
			obj2.function4()
			
def sum(list):
    sum = 0
    for e in list:
        sum = sum + e
    return sum
mylist = [1,2,3,4,5]
print(sum(mylist))
	
		How to develop Web Applications using Python.

s1.json 

{
    "name" : "XYZ",
    "Dept" : "IT"
}

pyconsoleapp1.py

filename = "s1.json"
with open(filename) as f:
    lines = f.readlines()
    print(lines)
i = 1
for line in lines:
    print(str(i) + " " + line),
    i = i + 1


py ./pyconsoleapp1.py



Next ::::
	
	Web Application Server -> flask & Django Web Application Framework to develop web apps.
		
		
	flask WAS 
		
		localhost web application 
			
			
	
	Core Projects ::::		
		
		
			
#######################
Day 49: 17th Oct. 2024
#######################				

	Python Web Application using flask Web Application Server.
	
	Prepare the python project to create web application 
	
	Flask WAS 
	
	Demo using Python Web Application
	
	
	Capstone Project Discussion:
	
	
	1. Python web application :
		
		Open Visual Studio Code 
		Create Project Folder :
				
##################################

Folder Structure :

	My-WebApp-Project
		app.py
		templates
			sample.html
			
##################################
		
		Open New Terminal :			
			
			Install : 	Web Application Framework
				pip install flask
		
			Create app.py 
		
from flask import Flask, render_template

app = Flask(__name__)

@app.route('/')

def sample():
	return render_template("sample.html")

if "__name__" == "__main__":
	app.run(debug=True)	
	
	
		Create "templates" folder at root level :::
				Create Html files :: eg. sample.html 
				
<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>www.loksaieta.com</title>
	<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
</head>
<body>
  <div class="jumbotron" style="background-color:white">
	  <img src="https://octodex.github.com/images/spidertocat.png" alt="Spidertocat"
		   class="img-responsive center-block" style="width:250px"/>
	  <h2 class="text-center">Hello Everyone</h2>
	  <p class="text-center"> Python Demo...</p>
  </div>
</body>
</html>	


		set FLASK_APP=sample
	
		python -m flask run	
		
		
	
	#python boto3 / terraform / cloudformation
		
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~