DevOps Python Learning Repository

Overview

A learning-focused repository for Python automation, API integration, networking, and PostgreSQL database workflows tailored to DevOps and infrastructure practitioners. It contains sample scripts for Python fundamentals, file operations, HTTP APIs, scheduling, web scraping, socket programming, and database automation.

Target Audience: DevOps Engineers, Python Developers, Automation Specialists
Skill Level: Beginner to Intermediate
Python Version: 3.12+

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📋 Updated Project Structure

devops-python/
├── 1-hello.py
├── 2-fileread.py
├── 2-filewrite.py
├── 3-fileoperations.py
├── 4-ifelse.py
├── 4-loops.py
├── 4-break-continue.py
├── 4-oddeven.py
├── 5-functions.py
├── 5-modules.py
├── math_operations.py
├── networking/
│   ├── 6-networking-client.py
│   ├── 6-networking-request.py
│   ├── 6-networking-scap.py
│   └── 6-networking-server.py
├── sockets/
│   ├── client.py
│   ├── server.py
│   └── soc.py
├── apis/
│   ├── api-ex.py
│   └── api-req.py
├── automation/
│   ├── getlinks.py
│   ├── par.py
│   ├── par2.py
│   ├── task_schedule.py
│   └── output.json
├── python-postgres/
│   └── postgres-python.py
├── requirements.txt
├── devops-python-venv/
├── arjun.txt
└── README.md

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🎯 Learning Modules

1. Python Fundamentals (Modules 1-4)

File	Topic	Key Concepts
1-hello.py	Basic Syntax	Variables, data types, print output
2-fileread.py	File Reading	File opening, reading, closing
2-filewrite.py	File Writing	Writing text files, file persistence
3-fileoperations.py	File Utilities	Rename, delete, and filesystem checks
4-ifelse.py	Conditionals	If/elif/else logic, boolean evaluation
4-loops.py	Iteration	For loops, while loops, sequence iteration
4-break-continue.py	Loop Control	break, continue, loop termination
4-oddeven.py	Conditional Logic	Even/odd checks and branching

2. Functions & Modules (Module 5)

File	Purpose
5-functions.py	Defining and calling functions, return values
5-modules.py	Importing modules and using shared utilities
math_operations.py	Mathematical helper functions

3. Network Programming (Module 6)

File	Purpose
networking/6-networking-client.py	TCP client socket communication
networking/6-networking-server.py	TCP server socket communication
networking/6-networking-request.py	HTTP request handling example
networking/6-networking-scap.py	Packet analysis with Scapy
sockets/client.py	Socket client implementation
sockets/server.py	Socket server implementation
sockets/soc.py	Socket utilities and helpers

4. API & Automation Examples

File	Purpose
apis/api-ex.py	HTTP GET request example using requests
apis/api-req.py	HTTP PUT and DELETE request examples
automation/getlinks.py	Web scraping with BeautifulSoup
automation/par.py	JSON parsing and manipulation
automation/par2.py	Additional parsing utilities
automation/task_schedule.py	Scheduled task execution with schedule

5. Database Automation

File	Purpose
python-postgres/postgres-python.py	PostgreSQL connection and database automation using psycopg2

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🚀 Getting Started

Prerequisites

• Python: 3.12 or higher
• pip: Python package manager
• Virtual environment: Recommended for dependency isolation

Installation

1. Clone the repository:

   git clone <repository-url>
   cd devops-python

2. Create and activate a virtual environment:

   python3.12 -m venv devops-python-venv
   source devops-python-venv/bin/activate  # Linux/macOS
   # or
   devops-python-venv\Scripts\activate  # Windows

3. Install dependencies:

   pip install -r requirements.txt

4. Install optional extras used by some examples:

   pip install beautifulsoup4 schedule psycopg2-binary

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📖 Usage Examples

Basic Python Examples

python 1-hello.py
python 2-fileread.py
python 5-functions.py

API Examples

python apis/api-ex.py
python apis/api-req.py

Automation Examples

python automation/getlinks.py
python automation/par.py
python automation/task_schedule.py

PostgreSQL Example

python python-postgres/postgres-python.py

Networking Examples

python networking/6-networking-server.py
python networking/6-networking-client.py

Socket Programming Examples

python sockets/server.py
python sockets/client.py

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📝 Module Details

Fundamentals Breakdown

Variables & Data Types

• Integers, floats, strings
• Variable assignment and printing
• Basic expressions and formatting

File Operations

• Open, read, write, and close files
• File system checks
• Data persistence

Control Structures

• Conditional branching (if, elif, else)
• Iterative loops (for, while)
• Loop control with break and continue

Functions

• Defining reusable functions
• Passing arguments and returning values
• Reuse across scripts

Modules

• Built-in and custom module imports
• Encapsulation of shared logic
• Code organization and reuse

API & Automation

• REST API calls with requests
• JSON serialization and parsing
• HTML parsing with BeautifulSoup
• Task scheduling with schedule

Database Automation

• PostgreSQL connection management
• Query execution and result handling
• Database creation and metadata inspection

Network Programming

• TCP socket communication
• Server/client lifecycle management
• Data send/receive workflows
• Packet inspection with Scapy

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🔧 Configuration

Virtual Environment

The devops-python-venv/ virtual environment contains:

• Python 3.12 interpreter
• pip package manager
• Standard build tools such as setuptools and wheel

Recommended Packages

• requests
• beautifulsoup4
• schedule
• psycopg2-binary
• scapy

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💡 Best Practices Demonstrated

✅ Modular code organization
✅ Proper file handling
✅ Function reuse and abstraction
✅ API request workflows
✅ JSON parsing and automation scripting
✅ Scheduled task execution
✅ PostgreSQL database automation
✅ Socket-based network communication
✅ Clean dependency and environment management

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🎓 Recommended Learning Path

1. Start with 1-hello.py
2. Continue through file I/O and control flow examples
3. Learn function and module structure in 5-functions.py and 5-modules.py
4. Practice API and automation flows in apis/ and automation/
5. Explore sockets and networking scripts in networking/ and sockets/
6. Review the database automation example in python-postgres/postgres-python.py

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📚 Key Concepts Covered

Concept	Files	Level
Variables & Types	1-hello.py	Beginner
File I/O	2-fileread.py, 2-filewrite.py, 3-fileoperations.py	Beginner
Conditionals	4-ifelse.py, 4-oddeven.py	Beginner
Loops	4-loops.py, 4-break-continue.py	Beginner
Functions	5-functions.py	Beginner
Modules	5-modules.py, math_operations.py	Intermediate
HTTP APIs	apis/api-ex.py, apis/api-req.py	Intermediate
Automation	automation/*.py	Intermediate
PostgreSQL	python-postgres/postgres-python.py	Intermediate
Networking	networking/, sockets/	Intermediate

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⚠️ Important Notes

• Ensure arjun.txt exists for file I/O examples.
• Run server scripts before client scripts in networking examples.
• Update PostgreSQL credentials in python-postgres/postgres-python.py before execution.
• Install optional packages when using BeautifulSoup, scheduling, or PostgreSQL examples.
• Some network and Scapy examples may require elevated permissions.

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🛠️ Troubleshooting

Issue	Solution
ModuleNotFoundError	Activate virtual environment and install dependencies
FileNotFoundError	Confirm the working directory and file path
ConnectionRefusedError	Start the network server before the client
PostgreSQL connection error	Verify host, port, user, and password
Permission denied	Use a non-privileged port or run with elevated privileges

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📖 Additional Resources

• Python Documentation
• Requests Documentation
• BeautifulSoup Documentation
• psycopg2 Documentation
• Scapy Documentation
• Socket Programming Guide

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✍️ Author

Arjun
DevOps Python Learning Project

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📄 License

This project is provided as-is for educational purposes.

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Last Updated: May 2026
Status: Active Learning Project