taipy-utils

• taipy-utils
  • Installation
  • The Initial Problem
  • The Solution
  • Why This Package?
  • Features
    • @taipy_callback
    • @hold_control_during_execution
    • Combine Decorators
  • License
  • Contributing

Utility decorators for cleaner Taipy GUI applications.

Installation

pip install taipy-utils
# or
uv add taipy-utils

The Initial Problem

Taipy callbacks often become messy when mixing framework code with business logic. The following code comes from a personal project that uses Taipy, before adding the decorator:

def make_qr_code(state):
    with state as s:
        message = s.qr_code_input
        if len(message) > 1500:
            notify(s, "e", "Text too long")  # Framework-specific error handling
            return
        # ... 20 more lines of business logic mixed with state management

Issues:

• Long, hard-to-read functions
• Business logic tightly coupled to Taipy
• Can't reuse logic outside Taipy
• Difficult to test

The Solution

Separate concerns with decorators:

from taipy_utils import taipy_callback

def generate_qr_code(message: str, add_logo: bool, ...) -> str:
    if len(message) > 1500:
        raise ValueError("Text too long")  # Standard Python error handling
    # ... Rest of code
    return file_path

@taipy_callback
def make_qr_code(state):
    state.image_path = generate_qr_code(
        message=state.qr_code_input,
        add_logo=state.add_logo,
        ...
    )

Benefits:

• Separation of concerns: The UI stuff in one side, the business logic in another.
• Pythonic error handling (standard exceptions using ValueError)
• Reusable logic across frameworks
• Easy to test
• Automatic user notifications if a function raises an exception

Why This Package?

After creating @taipy_callback, I built @hold_control_during_execution for convenience. With several Taipy projects, making a package made sense:

1. Version control separate from individual projects
2. Share code across projects without copy-paste (DRY principle)
3. Might help others in the Taipy community

Features

@taipy_callback

Automatically translates Python exceptions into Taipy notifications:

from taipy_utils import taipy_callback

@taipy_callback
def on_submit(state):
    if state.age < 18:
        raise ValueError("Must be 18 or older")  # Shows warning notification
    process_data(state.data)  # Any other exception shows error notification

• ValueError → Warning notification (doesn't stop execution)
• Other exceptions → Error notification (re-raised for debugging)

@hold_control_during_execution

This decorator triggers the hold_control() function before a callback execution, and the resume_control() at the end.

from taipy_utils import hold_control_during_execution

@hold_control_during_execution("Loading data...")
def on_load_data(state):
    # calls hold_control()
    data = fetch_from_api()
    state.data = data
    # calls resume_control()

Combine Decorators

You can combine decorators if you wish:

@taipy_callback
@hold_control_during_execution("Processing...")
def on_process(state):
    if not state.file:
        raise ValueError("Please select a file")
    result = process_file(state.file)
    state.result = result

License

MIT.

Contributing

Issues welcome at github.com/enarroied/taipy_utils.