pythonbeginner1.5 hr est.

Build a CLI AI Chatbot with Python & OpenAI

Learn how to connect to the OpenAI API and build a conversational chatbot that runs entirely in your terminal. You will manage chat history to keep context.

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Last updated: 2026-06-05

Before You Begin

1
Python 3.8+
2
Basic API knowledge
3
OpenAI API Key

Project Architecture

Folder Structure

chatbot/
├── main.py
├── .env
└── requirements.txt

Data Flow

[User Input] -> [Append to History] -> [OpenAI API] -> [Response] -> [Output]

Source Code Breakdown & Implementation

Create a virtual environment and install the `openai` and `python-dotenv` packages. `pip install openai python-dotenv`

Load the environment variables so you don't hardcode your API key. ```python import os from dotenv import load_dotenv load_dotenv() client = OpenAI(api_key=os.getenv('OPENAI_API_KEY')) ```

Use a simple `while True` loop to accept `input()` from the user and format it as a user message dictionary.

Wrap the API call in a try/except block to catch network errors or quota limits gracefully.

Complete Solution Code

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Testing Checklist

• Ask a question
• Ask a follow up question to test context memory
• Type 'exit' to quit

Common Bugs

Bug: API Key Not Found
Fix: Make sure your .env file is in the same directory and contains OPENAI_API_KEY=your_key