Python Day

Python Day1 :3-Nov-2025

Python Full stack Developer

What is full stack developer do?

A Full stack Developer   is a software Professional who can build both the front end and backend parts of a web application.

Full-Stack Developer = Front-end + Backend database + Deployment

1.Front-end(Client side)

This is the part users interact with the website's look and feel.

Skill & technologies:

HTML -->Structure of web pages

CSS-->Staying and layout 

Java Script -> Interactivity

Framework/Libraries -->React,Angular,Jquery,etc.

2.Back-End(server side)

This is the brain of the application -where logic,database,and processing happen.

Skills & technologies:

Programming Languages-->Python, java, C# Nodes.js

Frameworks -->Django,Flask,Sprint Boot,ASP.NET

Databases-->Mysq,Postgressql,MongoDB

APIs-->Restful

Road map to Become a Full-stack Python Developer

1.ProgrammingLanguage (Python,C,C++,C#,Java,Ruby,NodeJS,etc..

2.Scripting/Front-end Languages(JavaScript,jQuery,HTML,Style Sheets,etc

3.Database Knowledge(Mysql,Sql server,Orace,Nosql(MongolDB,DynamoDB)etc)

4.Web framework/Techonologies(Django,Flask,ASP.Net,MVC,Spring Boot,etc)

5.Version Control/repositories(Git/Github,Bitbucket,..etc)

6.Operating System(Linux base os(Ubuntu,Amazon Linux),window,Macos,etc)

Python Day2:4-Nov-2025

What is a programming Language?

A programming Language is a type of compute language specifically designed to write programs -sets of instructions that a computer can execute to perform specific tasks.

Ex: Python, C#, C++, Java, JavaScript,etc

Purpose:To develop application ,To control hardware and software behavior, To solve computational problems.

Type of Programming Languages 

Programming languages can be broadly divided into three main types:

1)Low-level languages: These are close to machine language(binary or assembly),not understand to human

Ex: Assembly Language, Machine code.

2)High-level languages: Easier for human to read and write ,They use English like word 

Ex:- Python,Java,C#,C++,Java Script

3)Scripting languages: A type of high-level language mainly used for automation,web development, and processing

Ex:-Python,Java Script,Perl,Ruby,PHP

Introduction to Python  -History of Python 

Created by Guido van Rossum

Year :1989(released in 1991)

Origin: Developed in the Netherlands at CWI(Centrum Wiskunde & informatica)

Named after: "Monty Python's Flying circus", a British Comedy show --not the snake! 

Design goal: To make programming simple ,readable , and fun

Python version:

Python 1.0 -->Released in 1991

Python 2.0 -->Released in 2000(added Unicode support)

Python 3.0 -->Released in 2008(modern version, still used today)

Current version 3.14 https://www.python.org/

Importance of Python

Python is one of the most popular and versatile programming languages today.

Easy to Learn: Simple syntax,like english 

Versatile: Used for web, AI data science automation

Open source: Free to use and modify

Cross-platform: Runs on windows, Mac, Linux

Huge community: Millions of developers and libraries.

Powerful libraries: NumPy, Pandas, Django, TensorFlow, Flask, etc

What can I Build Using Python ?

Web Development --> Django,Flask,Websites 

Data Science -->Data analysis , Visualization

Artificial Intelligence --> Chatbots,Voice Assistants 

Machine learning --> Predictive models,r recommendation systems

Game development -->2D/3D games Using Pygame

Desktop application -->GUI tools(Tkinter,PyQt)

Automation --> File renaming,email sending,web scraping 

Cybersecurity -->Network scanners, password managers

Internet of things(IOT) -->Smart home systems 

Installation 

Step1: Download latest version https://www.python.org/downloads/

Check both these option 

• Use admin privileges when installing py.exe
• Add python.exe to PATH

Click Install Now

C:\Users\Administrator>python --version

Python 3.14.0

IDE environment for Python

An IDE is  a software application that provides everything     

What PyCharm?

PyCharm is an IDE (Integrated Development Environment) used for writing ,running and debugging python programs efficiently.

It's one of the most popular tools for Python developers, created by  a company called Jetbrains

Download 

https://www.jetbrains.com/pycharm/download/?section=windows

VS Code ?

Visual studio code is free ,open-source editor developed by microsoft ,Most popular tool used by developer worldwide ,including Python programmer to write,run  and debug code.

https://code.visualstudio.com/download

Python Day3:5-Nov-2025

Installation PyCharm 

Installation VS Code 

Python Day4:6-Nov-2025

Python syntax and structure:

• Syntax mean the set of rules that define how code must be written so python can understand it.
• Python's syntax is designed to be clean, readable , and simple  -- it uses indentation(spaces) instead of braces {} . 
• code runs top to button, directly 

For ex:

It will treated as String 

val1 = input("Enter first value: ")

val2 = input("Enter second value:")

print("You entered:", val1 + val2)

PS C:\Users\Administrator\Desktop\CCIT\PythonCourse> python syntax.py

Enter first value: 20

Enter second value:26

You entered: 2026

Type casting:

val1 = int(input("Enter first value: "))

val2 = int(input("Enter second value:"))

print("You entered:", val1 + val2)

PS C:\Users\Administrator\Desktop\CCIT\PythonCourse> python syntax.py

Enter first value: 20

Enter second value:26

You entered: 46

IF condition :

val1 = int(input("Enter first value: "))

val2 = int(input("Enter second value:"))

if val1 > 100:

    print("First Value exceeds 100.")

if val2 > 200:

    print("Second Value exceeds 200.")

print("Sum of the above values entered:", val1 + val2)

PS C:\Users\Administrator\Desktop\CCIT\PythonCourse> python syntax.py

Enter first value: 200

Enter second value:300

First Value exceeds 100.

Second Value exceeds 200.

Sum of the above values entered: 500

Method 

name = input("Enter your name: ")

def greet_user():

    print("Hello, " + name + "! Welcome to the program.")

    return "Greeting sent."

greet_user()        

PS C:\Users\Administrator\Desktop\CCIT\PythonCourse> python syntax.py

Enter your name: Subrahmanyam

Hello, Subrahmanyam! Welcome to the program.

This f means formatted string display the value between string

print(f"Hello,{name}, Welcome to the program.")

• Comments 

Single line Comments 

# This is the Single line 

Muti-line Comments : Use Triple quotes """ """ or     ''' '''

""" Calling the function to greet the user """

''' Calling the function to greet the user '''

greet_user()    

• Function Documentation (Doc String)

Every function can have its own docstring to describe what it does

Single Doc string

def add(a,b):

    """ This function adds two numbers and returns the result """

    return a + b

print(add.__doc__)

Multiple doc string

def add(a,b):

    """ This function adds two numbers and returns the result

     Second function adds two numbers and returns the result1 """

    return a + b

print(add.__doc__)

PS C:\Users\Administrator\Desktop\CCIT\PythonCourse> python method.py

This function adds two numbers and returns the result 

Second function adds two numbers and returns the result1

• Code Errors and Debugging Basics 

Type of Errors :

Syntax error : Invalid code format 

For example: Print("Hello" missing)

Runtime Error :Error while program runs

For example: 10/0 -->ZeroDivisionError

Logical Error: No crash, but wrong output

For example: Using + instead of * 

Example Debugging:

a = int(input("Enter the first number: "))

b = int(input("Enter the second number: "))

def add(a, b):

    return a / b

print(add(a, b))    

PS C:\Users\Administrator\Desktop\CCIT\PythonCourse> python method.py  

File "C:\Users\Administrator\Desktop\CCIT\PythonCourse\method.py", line 4, in add

    return a / b

           ~~^~~

ZeroDivisionError: division by zero

PS C:\Users\Administrator\Desktop\CCIT\PythonCourse> 

Fixed Version:

Try catch block

try:

    a = int(input("Enter the first number: "))

    b = int(input("Enter the second number: "))

    def add(a, b):

        return a / b

    print(add(a, b))  

except ZeroDivisionError:

        print("Error: Division by zero is not allowed.")

PS C:\Users\Administrator\Desktop\CCIT\PythonCourse> python method.py

Enter the first number: 20

Enter the second number: 0

Error: Division by zero is not allowed.

• Python Style Guide (PEP 8) Overview 

What is PEP 8?

PEP 8 stands for Python Enhancement Proposal #8 

It is the official style guide for writing Python code.

In simple words:

PEP 8 is like a rulebook that helps you write python code that looks clean, consistent, and professional 

1.Indentation ,2 Maximum line length,3.Blank Lines (separate section of the code),

4. Space around operators and commas (Always one space = ,+..etc)

5. Naming Conversation

 Type 

Variable/Functions :lowercase_with_underscores 

 For example: student_name, get_data()

 Constants: ALL_CAPS

 For example: P1=3.14,MAX_SPEED = 100

 Classes :PascalCase

 For example: class StudentDetails:

 Private variables: Start with_

 For example: _temp_value 

 Modules: Short,lowercase names 

 For example: math_utils.py

6. Function and class Definitions 

 Leave two blank lines before defining a new function or class 

7.Comments 

Navigating Python's Interactive shell

What is the Python Interactive shell?

The Python interactive shell (also known as the REPL) is a command line environment that lets you type and execute python commands one at a time -- and see the result immediately.

"REPL" Stands for 

 Read-->Eval-->print-->Loop

It read your command evaluates it, print the result and loops back for the next command 

It's like a python playground -where you can test small code snippets instantly without writing or saving a .py file 

--Thanks