Example: Langfuse Prompt Management with Langchain (Python)

%pip install langfuse langchain langchain-openai --upgrade

import os
 
# Get keys for your project from the project settings page: https://cloud.langfuse.com
os.environ["LANGFUSE_PUBLIC_KEY"] = "pk-lf-..." 
os.environ["LANGFUSE_SECRET_KEY"] = "sk-lf-..." 
os.environ["LANGFUSE_HOST"] = "https://cloud.langfuse.com" # 🇪🇺 EU region
# os.environ["LANGFUSE_HOST"] = "https://us.cloud.langfuse.com" # 🇺🇸 US region
 
# Your openai key
os.environ["OPENAI_API_KEY"] = "sk-proj-..."

from langfuse import get_client
from langfuse.langchain import CallbackHandler
 
# Initialize Langfuse client (prompt management)
langfuse = get_client()
 
# Initialize Langfuse CallbackHandler for Langchain (tracing)
langfuse_callback_handler = CallbackHandler()

langfuse.create_prompt(
    name="event-planner",
    prompt=
    "Plan an event titled {{Event Name}}. The event will be about: {{Event Description}}. "
    "The event will be held in {{Location}} on {{Date}}. "
    "Consider the following factors: audience, budget, venue, catering options, and entertainment. "
    "Provide a detailed plan including potential vendors and logistics.",
    config={
        "model":"gpt-4o",
        "temperature": 0,
    },
    labels=["production"]
);

# Get current production version of prompt
langfuse_prompt = langfuse.get_prompt("event-planner")

print(langfuse_prompt.prompt)

Plan an event titled {{Event Name}}. The event will be about: {{Event Description}}. The event will be held in {{Location}} on {{Date}}. Consider the following factors: audience, budget, venue, catering options, and entertainment. Provide a detailed plan including potential vendors and logistics.

from langchain_core.prompts import ChatPromptTemplate
 
langchain_prompt = ChatPromptTemplate.from_template(
        langfuse_prompt.get_langchain_prompt(),
        metadata={"langfuse_prompt": langfuse_prompt},
    )

model = langfuse_prompt.config["model"]
temperature = str(langfuse_prompt.config["temperature"])
print(f"Prompt model configurations\nModel: {model}\nTemperature: {temperature}")

Prompt model configurations
Model: gpt-4o
Temperature: 0

from langchain_openai import ChatOpenAI
 
model = ChatOpenAI(model=model, temperature=temperature)
 
chain = langchain_prompt | model

example_input = {
    "Event Name": "Wedding",
    "Event Description": "The wedding of Julia and Alex, a charming couple who share a love for art and nature. This special day will celebrate their journey together with a blend of traditional and contemporary elements, reflecting their unique personalities.",
    "Location": "Central Park, New York City",
    "Date": "June 5, 2024"
}

# we pass the callback handler to the chain to trace the run in Langfuse
response = chain.invoke(input=example_input,config={"callbacks":[langfuse_callback_handler]})
 
print(response.content)

To plan an event titled "{Event Name}" in Central Park, New York City on June 5, 2024, we need to consider several key factors: audience, budget, venue, catering options, and entertainment. Below is a detailed plan to ensure the event is successful and memorable.

### Event Overview
- **Event Name**: {Event Name}
- **Event Description**: {Event Description}
- **Date**: June 5, 2024
- **Location**: Central Park, New York City

### Audience
- **Target Audience**: Define the demographic (e.g., age group, interests, professional background) that the event is aimed at.
- **Expected Attendance**: Estimate the number of attendees to plan logistics accordingly.

### Budget
- **Total Budget**: Determine the overall budget for the event.
- **Allocation**:
  - Venue: 20%
  - Catering: 25%
  - Entertainment: 20%
  - Marketing and Promotion: 15%
  - Logistics and Rentals: 10%
  - Miscellaneous: 10%

### Venue
- **Location**: Central Park, NYC
- **Permits**: Obtain necessary permits from the NYC Parks Department for hosting an event in Central Park.
- **Layout**: Plan the layout considering the stage, seating, food stations, and restrooms.
- **Weather Contingency**: Arrange for tents or an alternative indoor venue in case of inclement weather.

### Catering Options
- **Vendors**: Consider local catering companies such as:
  - Great Performances
  - Abigail Kirsch
  - Neuman’s Kitchen
- **Menu**: Offer a diverse menu catering to various dietary preferences (vegetarian, vegan, gluten-free).
- **Beverages**: Include a selection of non-alcoholic and alcoholic beverages, ensuring compliance with local regulations.

### Entertainment
- **Performers**: Book local bands, DJs, or performers that align with the event theme.
- **Sound and Lighting**: Hire a professional company to manage sound and lighting, ensuring high-quality production.
- **Activities**: Plan interactive activities or workshops relevant to the event theme.

### Logistics
- **Transportation**: Provide information on public transport options and parking facilities.
- **Security**: Hire a security team to ensure the safety of all attendees.
- **First Aid**: Arrange for a first aid station with trained medical personnel.
- **Waste Management**: Implement a waste management plan with recycling options.

### Marketing and Promotion
- **Strategy**: Develop a marketing plan using social media, email campaigns, and partnerships with local businesses.
- **Materials**: Create promotional materials such as flyers, banners, and digital content.
- **Registration**: Set up an online registration platform for attendees to RSVP.

### Potential Vendors
- **Event Planner**: Hire a local event planning company with experience in organizing events in Central Park.
- **AV Equipment**: Rent from companies like AV NYC or Big Apple Rentals.
- **Decor**: Work with a local decor company to enhance the event's aesthetic.

### Timeline
- **6 Months Prior**: Finalize vendors, secure permits, and begin marketing.
- **3 Months Prior**: Confirm all bookings, finalize the guest list, and start ticket sales.
- **1 Month Prior**: Conduct a walkthrough of the venue, finalize the menu, and confirm all logistics.
- **1 Week Prior**: Reconfirm all arrangements with vendors and staff.
- **Event Day**: Arrive early for setup, conduct a final check, and ensure all elements are in place.

By addressing these factors and following this plan, {Event Name} is set to be a successful and enjoyable event for all attendees.