Calling OpenAI APIs from code

Steps

a. Get openAI API Key

openaAI API Key

b. Call openai APIs using Postman

https://web.postman.co/workspace

Place API_KEY got in step-1 in Authorization Header

GET https://api.openai.com/v1/models
Header
    Authorization: Bearer API_KEY

POST https://api.openai.com/v1/chat/completions
Header
    Authorization: Bearer API_KEY
Body
    {
        "model": "gpt-3.5-turbo",
        "messages": [{"role": "user", "content": "What is capital of France?"}],
        "temperature": 0.7
    }            

c. Calling APIs using Code

Create a Virtual Environment (Windows)

//Install python from Microsoft Store
> python
Python 3.13.2 (tags/v3.13.2:4f8bb39, Feb  4 2025, 15:23:48) [MSC v.1942 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> ^Z

// Create venv
> python -m venv ./python_venv
>

// Activate venv
> cd python_venv
> Scripts\activate
(python_venv) path\python_venv>        

Install openai inside Virtual Env

// Install openai
(python_venv) c:\go-here\Code\python\virtual_avatar> pip install openai

//Set API Key in User environment variable
OPENAI_API_KEY = value        

Call openai API from Code

from openai import OpenAI

def get_chatgpt_response():
    client = OpenAI()
    completion = client.chat.completions.create(
        model="gpt-3.5-turbo",
        messages=[
            {"role": "system", "content": 
                "You are a poetic assistant, skilled in explaining complex programming concepts with creative flair."},
            {"role": "user", "content": 
                "Compose a poem that explains the concept of recursion in programming."}
        ]
    )

OR

def get_chatgpt_response():
    client = OpenAI()
    completion = client.chat.completions.create(
        model="gpt-3.5-turbo",
        messages=[
            {
                "role": "user",
                "content": "What's Capital of Russia?"
            }
        ]
    )
    print(completion.choices[0].message)        //Moscow

get_chatgpt_response()