05 Getting Started with GenAI Apps (Part 5): OpenAI API Build a Language Translator with LangChain

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Code
!pip install -q langchain langchain_openai streamlit
!npm install localtunnel
import os
from google.colab import userdata
os.environ[‘OPENAI_API_KEY'] = userdata.get(‘openai’)

from google.colab import drive
drive.mount('/content/drive')
!streamlit run drive/MyDrive/colab_files/demo_translator_groq.py
!npx localtunnel --port 8501

demo_translator_openai.py
import streamlit as st
from langchain_openai import ChatOpenAI
from langchain_core.prompts import ChatPromptTemplate
from langchain_core.output_parsers import StrOutputParser

model = ChatGroq(model="gpt”-4o, temperature=0)

def translator_text(text,language):
prompt = ChatPromptTemplate.from_messages([
("system", f"""You are a professional translator. Your task is to accurately translate the given English text into {language}.
Preserve the original meaning, tone, and context.
Provide a natural, fluent translation.
Avoid unnecessary explanations or additional text—return only the translated sentence.
"""),
("human", "{text}"),
])

chain = prompt | model | StrOutputParser()
return chain.invoke({"text": text})

st.title(“OpenAI Translator")

languages = [
"Hindi", "Tamil", "Malayalam", "French", "Spanish",
"German", "Chinese", "Japanese", "Arabic", "Portuguese"
]

selected_languages = st.multiselect("Select languages to translate into:", languages, default=["Hindi", "Tamil","Malayalam"])

user_input = st.text_area("Enter text to translate", "")

if st.button("Translate"):
if user_input.strip():
with st.spinner("Translating.."):
translations = {lang: translator_text(user_input,lang) for lang in selected_languages}
st.write(selected_languages)
st.write(translation)
st.subheader("Translations:")
for lang, translation in translations.items():
st.write(f"**{lang}:** {translation}")

else:
st.warning("Please enter some text")

GenAI app basic class
This video demonstrates how to build a genAI app using Langchain, open api key, and streamlit in google colab for free
step-by-step guide on genai apps
How to generate open api key
Add pay as u go credit balance in open
Buy api credits form testing
Convert langchain_groq code to open code
Pip install langchain_openai

Stream helps to create simple and interactive interface
Good for prototypes
Exposing web server from google collab
How to install streamline app
Basics of streamline
Add button in streamlit
Store streamline log in to file
Use local tunnel to expose port
Pip install -q streamlit
npm install localtunnel
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Store python files in google drive for google collar to access it
From google.colab import drive
drive.mount(‘/content/drive’)
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Langchain introduction
Langchain ChatPromptTemplate
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os.environ[‘’GROQ_API_KEY]
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From langhcain_groq import ChatGroq
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streamlit
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