pocketflow/cookbook/pocketflow-flow

PocketFlow Text Converter

A practical example demonstrating how to use PocketFlow to create an interactive text converter. This example showcases important concepts like data flow between nodes, user choice-based branching, and state management using the shared store.

Features

• Convert text to UPPERCASE
• Convert text to lowercase
• Reverse text
• Remove extra spaces
• Interactive command-line interface
• Continuous flow with option to process multiple texts

Project Structure

.
├── flow.py        # Nodes and flow implementation
├── main.py        # Application entry point
└── README.md      # Documentation

Implementation Details

1. TextInput Node:

   • prep(): Gets text input from user
   • post(): Shows options menu and returns action based on choice

2. TextTransform Node:

   • prep(): Gets text and choice from shared store
   • exec(): Applies the chosen transformation
   • post(): Shows result and asks if continue

3. Flow Structure:

   • Input → Transform → (loop back to Input or exit)
   • Demonstrates branching based on actions ("transform", "input", "exit")

How to Run

1. Create a virtual environment:

python -m venv venv
source venv/bin/activate  # On Windows: venv\Scripts\activate

2. Install dependencies:

pip install -r requirements.txt

3. Run the example:

python main.py

What You'll Learn

This example demonstrates several important PocketFlow concepts:

• Node Architecture: How to structure logic using prep/exec/post pattern
• Flow Control: How to use actions to control flow between nodes
• Shared Store: How to share data between nodes
• Interactivity: How to create interactive flows with user input
• Branching: How to implement different paths based on choices

Additional Resources

• PocketFlow Documentation
• Flow Guide
• Node Guide