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Live Coding Environment for Python, Qt and QML

PyPI version Build Status License: MIT Code style: black

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This project provides a live coding environment for Python and Qt. It supports both PyQt and Qt for Python (PySide2) via the python_qt_binding.

See also:

Install

To install the live coding environment run:

python setup.py install

or install it via pip

pip install python-qt-live-coding

You also need to install PyQt or PySide2 for this application to work. The quickest way to achieve this is to use pip.

pip install PyQt5

or

pip install pyside2

Use

The live coding environment comes with a live runner which enables your to live code Qt GUIs quickly.

Run following to test drive the example:

python_qt_live_coding examples

Your will instantly see the example project in the live runner.

Live Runner Example

Now you can either select the MainScreen.qml file or type MainScreen in the filter.

When you type, the file will be automatically selected.

When loaded you will see following.

Live Runner Example

This is the example GUI inside the live runner.

Now press the Edit button. Your favorite text editor should open promptly.

Edit the code inside the editor und you will see the GUI updates instantly when you save the document.

Integrate in your application

Alternatively, you can integrate live coding into your Python Qt application.

This especially useful if you want to customize the live coding GUI for your needs.

For this purpose you need to do following things:

  1. Integrate the start_live_coding function into your main.py.
  2. Add a command line argument for live coding.
  3. Optionally, add a custom live.qml.

To learn more about how this works please take a look the integrated example.

Python QML module support

The live coding environment has built in support for Python QML modules.

The idea is to place QML and Python code in the same directory, similar to how you would create a Qt/C++ application. Additionally, with Python we have the advantage of being able to discover modules automatically.

For this purpose add register_qml_types function to the __init__.py of your Python QML module. See the example in examples/standalone/module/__init__.py.

However, so far automatic reloading of Python code is not support. When you work on a Python module please use the Restart button which restarts the live coding application instead.

Forcing PyQt or Python for Qt (PySide2) usage

In some cases you might want to force which Python Qt binding python_qt_live_coding is using. This can be done by passing the optional --binding argument via the command line.

python_qt_live_coding -b pyside .

PyCharm Support

For this application to work with PyCharm and other IntelliJ IDEs please disable the "safe write" feature. The feature writes a temporary file before saving any file, which can confuse the file change watcher.

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Live coding environment for Python, Qt and QML.

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