Few Shot Prompting

!pip install langchain-google-genai langchain-core

from langchain_google_genai import ChatGoogleGenerativeAI
from langchain_core.messages import HumanMessage, AIMessage
import os
from getpass import getpass

os.environ["GOOGLE_API_KEY"] = getpass("Enter your API key: ")

model = ChatGoogleGenerativeAI(
    model="gemini-2.5-flash",
    temperature=0.3
)

messages = [
    HumanMessage(content="Classify the sentiment: 'I love this product!'"),
    AIMessage(content="Positive"),
    HumanMessage(content="Classify the sentiment: 'This is terrible.'"),
    AIMessage(content="Negative"),
    HumanMessage(content="Classify the sentiment: 'It's okay, nothing special.'")
]

response = model.invoke(messages)
print(response.content)